LT5579 [Linear]
1.5GHz to 3.8GHz High Linearity Upconverting Mixer; 1.5GHz至3.8GHz的高线性度上变频混频器
| 型号： | LT5579 |
| 厂家： | 
Linear |
| 描述： | 1.5GHz to 3.8GHz High Linearity Upconverting Mixer |
| 文件： | 总20页 (文件大小：243K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT5579
1.5GHz to 3.8GHz
High Linearity
Upconverting Mixer
FEATURES
DESCRIPTION
The LT®5579 mixer is a high performance upconverting
mixer optimized for frequencies in the 1.5GHz to 3.8GHz
range. The single-ended LO input and RF output ports
simplify board layout and reduce system cost. The mixer
needs only –1dBm of LO power and the balanced design
resultsinlowLOsignalleakagetotheRFoutput.At 2.6GHz
operation, the LT5579 provides high conversion gain of
1.3dB, high OIP3 of +26dBm and a low noise floor of
–157.5dBm/Hz at a –5dBm RF output signal level.
n
High Output IP3: +27.3dBm at 2.14GHz
Low Noise Floor: –158dBm/Hz (P
n
= –5dBm)
OUT
n
n
n
n
n
n
n
High Conversion Gain: 2.6dB at 2.14GHz
Wide Frequency Range: 1.5GHz to 3.8GHz*
Low LO Leakage
Single-Ended RF and LO
Low LO Drive Level: –1dBm
Single 3.3V Supply
5mm × 5mm QFN24 Package
The LT5579 offers a high performance alternative to pas-
sivemixers.Unlikepassivemixers,whichhaveconversion
loss and require high LO drive levels, the LT5579 delivers
conversion gain at significantly lower LO input levels and
is less sensitive to LO power level variations. The lower
LO drive level requirements, combined with the excellent
LO leakage performance, translate into lower LO signal
contamination of the output signal.
APPLICATIONS
n
GSM/EDGE, W-CDMA, UMTS, LTE and TD-SCDMA
Basestations
n
2.6GHz and 3.5GHz WiMAX Basestations
n
2.4GHz ISM Band Transmitters
High Performance Transmitters
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Operation over wider frequency range is possible with reduced performance.
Consult Linear Technology for information and assistance.
TYPICAL APPLICATION
Frequency Upconversion in 2.14GHz W-CDMA Transmitter
LO INPUT
–1dBm (TYP)
Gain, NF and OIP3 vs
RF Output Frequency
LO
30
LT5579
OIP3
25
T
= 25°C
= 3.3V
= 240MHz
= f + f
A
CC
V
GND
20
15
f
f
IF
BIAS
11Ω
LO RF IF
SSB NF
GAIN
IF
INPUT
RF
OUTPUT
40nH
MABAES0061
4:1
10
5
82pF
82pF
1.8nH
+
–
IF
1
5
RF
0.45pF
2
3
33pF
4
IF
0
1900 2000
2100
2200
2300
2400
40nH
11Ω
RF FREQUENCY (MHz)
V
CC
5579 TA01a
5579 TA01b
V
CC
3.3V
1μF
100pF
1nF
5579f
1
LT5579
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
TOP VIEW
(Note 1)
Supply Voltage.........................................................3.6V
LO Input Power..................................................+10dBm
24 23 22 21 20 19
LO Input DC Voltage ........................–0.3V to V + 0.3V
CC
GND
GND
1
2
3
4
5
6
18 GND
RF Output DC Current ............................................60mA
GND
GND
17
16
IF Input Power (Differential)...............................+13dBm
+
IF
+
–
IF , IF DC Currents ...............................................60mA
.................................................................... 150°C
25
–
IF
15 RF
T
JMAX
GND
GND
14 GND
13 GND
Operating Temperature Range.................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
7
8
9 10 11 12
UH PACKAGE
24-LEAD (5mm s 5mm) PLASTIC QFN
T
= 150°C, θ = 34°C/W
JA
JMAX
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
24-Lead (5mm × 5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
LT5579IUH#PBF
LT5579IUH#TRPBF
5579
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
VCC = 3.3V, TA = 25°C (Note 3), unless otherwise noted.
DC ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Requirements (V
Supply Voltage
)
CC
3.15
3.3
3.6
V
DC
Supply Current
V
CC
V
CC
= 3.3V, P = –1dBm
226
241
250
mA
mA
LO
= 3.6V, P = –1dBm
LO
Input Common Mode Voltage (V
)
CM
Internally Regulated
570
mV
AC ELECTRICAL CHARACTERISTICS (Notes 2, 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MHz
IF Input Frequency Range (Note 4)
LO Input Frequency Range (Note 4)
RF Output Frequency Range (Note 4)
Requires Matching
Requires Matching Below 1GHz
Requires Matching
LF to 1000
750 to 4300
900 to 3900
MHz
MHz
5579f
2
LT5579
VCC = 3.3V, TA = 25°C, PRF = –5dBm (–5dBm/tone for 2-tone tests,
AC ELECTRICAL CHARACTERISTICS
Δf = 1MHz), PLO = –1dBm, unless otherwise noted. Test circuits are shown in Figure 1. (Notes 2, 3)
PARAMETER
CONDITIONS
Z = 50Ω, External Match
MIN
TYP
15
MAX
UNITS
dB
IF Input Return Loss
LO Input Return Loss
RF Output Return Loss
LO Input Power
O
Z = 50Ω, 1100MHz to 4000MHz
O
>9
dB
Z = 50Ω, External Match
O
>10
dB
–5 to 2
dBm
VCC = 3.3V, TA = 25°C, PRF = –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), PLO = –1dBm, unless otherwise noted.
Low side LO for 1750MHz and 3600MHz. High side LO for 2140MHz and 2600MHz. (Notes 2, 3, 4)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Conversion Gain
f
f
f
f
= 240MHz, f = 1750MHz
1.8
2.6
dB
dB
dB
dB
IF
IF
IF
IF
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
1.3
RF
= 456MHz, f = 3600MHz
–0.5
RF
Conversion Gain vs Temperature
A
f
f
f
f
= 240MHz, f = 1750MHz
–0.020
–0.020
–0.027
–0.027
dB/°C
dB/°C
dB/°C
dB/°C
IF
IF
IF
IF
RF
(T = –40°C to 85°C)
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
Output 3rd Order Intercept
Output 2nd Order Intercept
Single Sideband Noise Figure
f
f
f
f
= 240MHz, f = 1750MHz
29
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dB
dB
dB
dB
IF
IF
IF
IF
RF
= 240MHz, f = 2140MHz
27.3
26.2
23.2
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
f
IF
f
IF
f
IF
f
IF
= 240MHz, f = 1750MHz
41
42
45
54
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
f
IF
f
IF
f
IF
f
IF
= 240MHz, f = 1750MHz
9.2
9.9
12
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
12
RF
Output Noise Floor (P
= –5dBm)
f
IF
f
IF
f
IF
f
IF
= 240MHz, f = 1750MHz
–159.5
–158.1
–157.5
–155.5
dBm/Hz
dBm/Hz
dBm/Hz
dBm/Hz
OUT
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
Output 1dB Compression
IF to LO Isolation
f
f
f
f
= 240MHz, f = 1750MHz
13.3
13.9
13.7
10.7
83
81
74
73
dBm
dBm
dBm
dBm
dB
dB
dB
dB
IF
IF
IF
IF
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
f
f
f
f
= 240MHz, f = 1750MHz
IF
IF
IF
IF
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
LO to IF Leakage
f
f
f
f
= 240MHz, f = 1750MHz
–23
–28
–26
–22
dBm
dBm
dBm
dBm
IF
IF
IF
IF
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
LO to RF Leakage
f
f
f
f
= 240MHz, f = 1750MHz
–39
–35
–36
–35
dBm
dBm
dBm
dBm
IF
IF
IF
IF
RF
= 240MHz, f = 2140MHz
RF
= 456MHz, f = 2600MHz
RF
= 456MHz, f = 3600MHz
RF
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3: The LT5579 is guaranteed to meet specified performance from
–40°C to 85°C
Note 4: SSB noise figure measurements performed with a small-signal
noise source and bandpass filter on LO signal generator. No other IF signal
applied.
Note 2: Each set of frequency conditions requires appropriate matching
(see Figure 1).
5579f
3
LT5579
(Test Circuit Shown in Figure 1)
TYPICAL DC PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
255
245
235
225
215
85°C
25°C
–40°C
205
195
3.0
3.2
3.3
3.4
3.5
3.6
3.1
SUPPLY VOLTAGE (V)
5579 G01
3300MHz to 3800MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 456MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), low side LO, PLO = –1dBm,
TYPICAL AC PERFORMANCE CHARACTERISTICS
output measured at 3600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
SSB Noise Figure Distribution at
3600MHz
Gain Distribution at 3600MHz
OIP3 Distribution at 3600MHz
30
25
16
25
T
T
T
= 90°C
= 25°C
= –45°C
T
A
T
A
T
A
= 90°C
= 25°C
= –45°C
T
T
T
= 90°C
= 25°C
= –45°C
A
A
A
A
A
A
14
12
20
15
20
15
10
8
10
5
6
10
5
4
2
0
0
0
10
11
12
NOISE FIGURE (dB)
13
14
20
21
23
22
OIP3 (dBm)
24
25
26
19
–0.5
–2.5 –2.0 –1.5 –1.0
0
0.5 1.0 1.5
GAIN (dB)
5579 G04
5579 G03
5579 G02
5579f
4
LT5579
TYPICAL AC PERFORMANCE CHARACTERISTICS
output measured at 3600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
3300MHz to 3800MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 456MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), low side LO, PLO = –1dBm,
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
LO-RF Leakage
vs RF Output Frequency
vs RF Output Frequency
16
12
8
28
24
20
16
12
8
20
0
–10
–20
–30
–40
–50
18
16
OIP3
14
12
10
8
85°C
25°C
–40°C
4
GAIN
0
85°C
25°C
–40°C
85°C
25°C
–40°C
6
–4
4
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
3300 3400
3600 3700 3800 3900
3200
3500
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
5579 G05
5579 G06
5579 G07
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
26
16
26
22
18
14
10
6
20
18
16
14
12
10
8
22
12
8
OIP3
GAIN
OIP3
18
85°C
85°C
25°C
–40°C
25°C
–40°C
4
14
4
GAIN
0
10
0
85°C
6
25°C
–40°C
–4
6
–4
4
3.0
3.2
3.3
3.4
3.5
3.6
3.1
–13
–9
–5
–1
3
–14
–10
–6
LO INPUT POWER (dBm)
–2
2
–17
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
5579 G10
5579 G08
5579 G09
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
20
0
0
18
16
14
12
10
8
–20
–20
–40
–40
–60
–80
–60
–80
85°C
25°C
–40°C
85°C
25°C
–40°C
85°C
25°C
–40°C
6
–100
–100
4
–12 –10 –8 –6 –4 –2
0
2
4
6
–12 –10 –8 –6 –4 –2
0
2
4
6
3.0
3.1
3.2
3.4
3.5
3.6
3.3
RF OUTPUT POWER (dBm/TONE)
RF OUTPUT POWER (dBm/TONE)
SUPPLY VOLTAGE (V)
5579 G11
5579 G12
5579 G13
5579f
5
LT5579
TYPICAL AC PERFORMANCE CHARACTERISTICS 2300MHz to 2700MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 456MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), high side LO, PLO = –1dBm,
output measured at 2600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
LO-RF Leakage
vs RF Output Frequency
vs RF Output Frequency
0
–10
–20
–30
–40
–50
16
12
8
30
26
22
18
14
10
18
16
14
12
85°C
25°C
–40°C
OIP3
GAIN
85°C
25°C
–40°C
10
8
4
6
4
2
0
85°C
25°C
–40°C
–4
2300 2400
2600
2200 2300 2400 2500 2600 2700 2800
RF FREQUENCY (MHz)
2200
2700 2800
2200
2400 2500 2600 2700 2800
RF FREQUENCY (MHz)
2500
2300
RF FREQUENCY (MHz)
5579 G16
5579 G15
5579 G14
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
28
16
28
24
20
16
12
8
18
16
14
12
10
8
OIP3
24
12
8
OIP3
GAIN
85°C
85°C
25°C
–40°C
25°C
20
16
12
8
–40°C
GAIN
4
4
6
0
0
85°C
25°C
–40°C
4
–4
–4
2
3.0
3.2
3.3
3.4
3.5
3.6
3.1
–17
–13
–9
–5
–1
3
–6
LO INPUT POWER (dBm)
–14
–10
–2
2
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
5579 G19
5579 G17
5579 G18
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
0
18
16
14
12
0
–20
–20
–40
–40
10
8
–60
–80
–60
–80
6
4
2
85°C
85°C
25°C
–40°C
85°C
25°C
–40°C
25°C
–40°C
–100
–100
3.1
3.2
3.4
–12 –10 –8 –6 –4 –2
0
2
4
6
3.0
3.3
3.5
3.6
–12 –10 –8 –6 –4 –2
0
2
4
6
RF OUTPUT POWER (dBm/TONE)
RF OUTPUT POWER (dBm/TONE)
SUPPLY VOLTAGE (V)
5579 G22
5579 G20
5579 G21
5579f
6
LT5579
TYPICAL PERFORMANCE CHARACTERISTICS 2140MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 240MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), high side LO, PLO = –1dBm,
output measured at 2140MHz, unless otherwise noted. (Test circuit shown in Figure 1)
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
vs RF Output Frequency
LO-RF Leakage
vs RF Output Frequency
18
16
14
12
10
8
0
–10
–20
–30
–40
–50
16
12
8
30
26
22
18
14
10
OIP3
GAIN
4
6
0
85°C
25°C
–40°C
85°C
25°C
–40°C
85°C
25°C
–40°C
4
2
–4
2150
RF FREQUENCY (MHz)
1950
2050
2250
2350
1950
2050
2150
2250
2050
2150
2250
2350
1950
2350
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
5579 G24
5579 G25
5579 G23
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
30
26
22
18
14
10
18
16
14
12
10
8
16
12
8
30
26
22
18
14
10
OIP3
GAIN
OIP3
GAIN
4
4
6
0
0
85°C
85°C
25°C
–40°C
85°C
25°C
–40°C
4
25°C
–40°C
–4
2
–4
–13
–9
–5
–1
3
–14
–10
–6
LO INPUT POWER (dBm)
–2
2
–17
3.0
3.2
3.3
3.4
3.5
3.6
3.1
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
5579 G26
5579 G27
5579 G19
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
18
16
14
12
10
8
0
0
–20
–40
–20
–40
–60
–80
–60
–80
6
85°C
25°C
–40°C
85°C
25°C
85°C
25°C
–40°C
4
2
–40°C
–100
–100
–2
RF OUTPUT POWER (dBm/TONE)
–2
RF OUTPUT POWER (dBm/TONE)
3.1
3.2
3.4
–10 –8 –6 –4
0
2
4
6
–10 –8 –6 –4
0
2
4
6
3.0
3.5
3.6
3.3
SUPPLY VOLTAGE (V)
5579 G29
5579 G30
5579 G31
5579f
7
LT5579
TYPICAL PERFORMANCE CHARACTERISTICS 1750MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 240MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, Δf = 1MHz), low side LO, PLO = –1dBm,
output measured at 1750MHz, unless otherwise noted. (Test circuit shown in Figure 1)
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
vs RF Output Frequency
LO-RF Leakage
vs RF Output Frequency
16
12
8
30
26
22
18
14
10
18
16
14
12
0
–10
–20
–30
–40
–50
85°C
25°C
–40°C
OIP3
GAIN
85°C
25°C
–40°C
10
8
4
6
4
2
0
85°C
25°C
–40°C
–4
1700
1750
RF FREQUENCY (MHz)
1850
1650
1700
1750
1800
1850
1900
1650
1900
1800
1650
1700
1750
1800
1850
1900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
5579 G32
5579 G33
5579 G34
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
32
28
24
20
16
12
16
12
8
30
26
22
18
14
10
18
16
14
12
OIP3
OIP3
GAIN
85°C
25°C
–40°C
10
8
GAIN
4
4
6
4
2
0
0
85°C
25°C
–40°C
85°C
25°C
–40°C
–4
–4
–13
–9
–1
–17
3
3.0
3.2
3.3
3.4
3.5
3.6
–5
3.1
–17
–13
–9
–5
–1
3
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
LO INPUT POWER (dBm)
5579 G36
5579 G37
5579 G35
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
0
0
18
16
14
12
–20
–40
–20
–40
10
8
–60
–80
–60
–80
6
4
2
85°C
25°C
–40°C
85°C
85°C
25°C
25°C
–40°C
–40°C
–100
–100
3.1
3.2
3.4
–2
RF OUTPUT POWER (dBm/TONE)
3.0
3.5
3.6
–10 –8 –6 –4
0
2
4
6
3.3
–2
RF OUTPUT POWER (dBm/TONE)
–10 –8 –6 –4
0
2
4
6
SUPPLY VOLTAGE (V)
5579 G40
5579 G39
5579 G38
5579f
8
LT5579
PIN FUNCTIONS
GND(Pins1,2,5-7,12-14,16-18,19-21,23,24):Ground
Connections. These pins are internally connected to the
exposed pad and should be soldered to a low impedance
RF ground on the printed circuit board.
RF (Pin 15): Single-Ended RF Output. This pin is con-
nected to an internal transformer winding. The opposite
end of the winding is grounded internally. An impedance
transformation may be required to match the output and a
DC decoupling capacitor is required if the following stage
has a DC bias voltage present.
+
–
IF , IF (Pins 3, 4): Differential IF Input. The common
mode voltage on these pins is set internally to 570mV. The
DC current from each pin is determined by the value of
an external resistor to ground. The maximum DC current
through each pin is 60mA.
LO(Pin22):Single-EndedLocalOscillatorInput.Aninternal
series capacitor acts as a DC block to this pin.
Exposed Pad (Pin 25): PGND. Electrical and thermal
ground connection for the entire IC. This pad must be
soldered to a low impedance RF ground on the printed
circuit board. This ground must also provide a path for
thermal dissipation.
V
(Pins 8-11): Power Supply Pins for the IC. These
CC
pins are connected together internally. Typical current
consumption is 226mA. These pins should be connected
together on the circuit board with external bypass capaci-
tors of 1000pF, 100pF and 10pF located as close to the
pins as possible.
5579f
9
LT5579
BLOCK DIAGRAM
25
EXPOSED
PAD
15
RF
V
CC
V
CC
V
CC
V
CC
11
10
9
LO
22
DOUBLE
BALANCED
MIXER
LO BUFFER
V
CC2
BIAS
8
V
CC2
V
CM
CTRL
+
–
IF
IF
3
4
5579 BD
GND PINS ARE NOT SHOWN
5579f
10
LT5579
TEST CIRCUIT
LO INPUT
R1
L1
24 23 22 21 20 19
1
2
3
4
5
6
18
17
16
15
14
13
T1
4:1
GND
GND
GND
C1
C2
TL1
TL2
GND
GND
RF
RF
OUTPUT
+
IF
INPUT
IF
L3
TL3
C9
C3
GND
–
IF
C8
GND
GND
GND
GND
L2
R2
7
8
9
10 11 12
V
CC
C4
C5
C6
C7
5579 F01
f
= 1750MHz
= 240MHz
f
= 2140MHz
= 240MHz
f
= 2600MHz
= 456MHz
f
= 3600MHz
= 456MHz
RF
IF
RF
IF
RF
IF
RF
IF
REF DES
C1, C2
C3
f
f
f
f
SIZE
COMMENTS
AVX
82pF
—
82pF
—
33pF
2.7pF
100pF
10pF
1nF
33pF
1.8pF
100pF
10pF
1nF
0402
0402
0402
0603
0402
0603
0402
0402
0402
0402
0603
SM-22
—
AVX
C4
100pF
10pF
1nF
100pF
10pF
1nF
AVX
C5
AVX
C6
AVX
C7
1μF
1μF
1μF
1μF
Taiyo Yuden LMK107BJ105MA
AVX ACCU-P
C8
1.2pF
33pF
40nH
6.8nH
0.45pF
33pF
40nH
1.8nH
—
0.7pF
33pF
40nH
0ꢀ
C9
33pF
40nH
1nH
AVX
L1, L2
L3
Coilcraft 0402CS
Toko LL1005-FHL/0ꢀ Jumper
IRC PFC-W0603R-03-11R1-B
M/A-COM MABAES0061
R1, R2
T1
11ꢀ, 0.1%
4:1
11ꢀ, 0.1%
4:1
11ꢀ, 0.1%
4:1
11ꢀ, 0.1%
4:1
TL1, TL2*
TL3
—
—
1.3mm
2.3mm
1.9mm
2.3mm
Z = 70Ω Microstrip
O
2.3mm
2.3mm
—
Z = 70Ω Microstrip
O
*Center-to-center spacing between C9 and C3. Center of C9 is 3.0mm from the edge of the IC package for all cases.
Figure 1. Test Circuit Schematic
5579f
11
LT5579
APPLICATIONS INFORMATION
The LT5579 uses a high performance LO buffer amplifier
drivingadouble-balancedmixercoretoachievefrequency
conversion with high linearity. Internal baluns are used to
provide single-ended LO input and RF output ports. The
IF input is differential. The LT5579 is intended for opera-
tion in the 1.5GHz to 3.8GHz frequency range, though
operation outside this range is possible with reduced
performance.
The purpose of the inductors (L1 and L2) is to reduce the
loadingeffectsofR1andR2. TheimpedancesofL1andL2
should be at least several times greater than the IF input
impedance at the desired IF frequency. The self-resonant
frequency of the inductors should also be at least several
times the IF frequency. Note that the DC resistances of
L1 and L2 will affect the DC current and may need to be
accounted for in the selection of R1 and R2.
L1 and L2 should connect to the signal lines as close to
the package as possible. This location will be at the lowest
impedancepoint, whichwillminimizethesensitivityofthe
performance to the loading of the shunt L-R branches.
IF Input Interface
TheIFinputsaretiedtotheemittersofthedouble-balanced
mixer transistors, as shown in Figure 2. These pins are
internally biased to a common mode voltage of 570mV.
TheoptimumDCcurrentinthemixercoreisapproximately
50mA per side, and is set by the external resistors, R1 and
R2. The inductors and resistors must be able to handle
the anticipated current and power dissipation. For best
LO leakage performance the board layout must be sym-
metrical and the input resistors should be well matched
(0.1% tolerance is recommended).
Capacitors C1 and C2 are used to cancel out the parasitic
series inductance of the IF transformer. They also provide
DCisolationbetweentheIFportstopreventunwantedinter-
actions that can affect the LO to RF leakage performance.
The differential input resistance to the mixer is approxi-
mately 10Ω, as indicated in Table 1. The package and
external inductances (TL1 and TL2) are used along with
R1
LT5579
IF
L1
50mA
C1
C2
INPUT T1
4:1
TL1
+
IF
3
4
570mV
2k
2k
V
CC
C9
TL2
C3
–
IF
570mV
50mA
L2
5579 F02
R2
Figure 2. IF Input with External Matching
5579f
12
LT5579
APPLICATIONS INFORMATION
C9 to step the impedance up to about 12.5Ω. At lower
frequencies additional series inductance may be required
between the IF ports and C9. The position of C9 may vary
withtheIFfrequencyduetothedifferentseriesinductance
requirements. The 4:1 impedance ratio of transformer T1
completes the transformation to 50 ohms. Table 1 lists the
differentialIFinputimpedancesandreflectioncoefficients
for several frequencies.
The purpose of capacitor C3 is to improve the LO-RF
leakage in some applications. This relatively small-valued
capacitor has little effect on the impedance match in most
cases. This capacitor should typically be located close to
the IC, however, there may be cases where re-positioning
the capacitor may improve performance.
The measured return loss of the IF input is shown in
Figure 3 for application frequencies of 70MHz, 240MHz
and 456MHz. Component values are listed in Table 2. (For
70MHz matching details, refer to Figure 8.)
Table 1. IF Input Differential Impedance
REFLECTION COEFFICIENT
FREQUENCY
(MHz)
IF INPUT
IMPEDANCE
MAG
0.70
0.70
0.70
0.70
0.70
0.68
0.67
0.65
0.64
ANGLE
177
175
174
173
170
168
167
158
148
Table 2. IF Input Component Values
70
140
170
190
240
380
450
750
1000
8.8+j1.3
8.7+j2.3
9.0+j2.8
8.9+j3.0
9.0+j4.0
9.7+j4.9
10.0+j5.2
10.8+j9.4
11.8+j13.8
FREQUENCY C1, C2
C9
C3
L1, L2 R1, R2 MATCH BW
(MHz)
(pF)
1000
82
(pF)
(pF)
(nH)
100
40
(Ω) (at 12dB RL)
140
120
33
(1)
(1)
(1)
9.1
11
11
<50 to 158
174 to 263
330 to 505
240
450
33
33
40
Note: (1) Depends on RF, (2) T1 = M/A-Com MABAES0061
0
–5
–10
–15
–20
–25
c
b
a
400
500 600 700 800
0
100 200 300
FREQUENCY (MHz)
5579 F03
Figure 3. IF Input Return Loss with 70MHz (a),
240MHz (b) and 456MHz (c) Matching
5579f
13
LT5579
APPLICATIONS INFORMATION
LO Input Interface
While external matching of the LO input is not required
for frequencies above 1.1GHz, external matching should
be used for lower LO frequencies for best performance.
Table 3 lists the input impedance and reflection coefficient
vs frequency for the LO input for use in such cases.
Thesimplifiedschematicforthesingle-endedLOinputport
is shown in Figure 4. An internal transformer provides a
broadband impedance match and performs single-ended
to differential conversion. An internal capacitor also aids
in impedance matching and provides DC isolation to the
primary transformer winding. The transformer secondary
feeds the differential limiting amplifier stages that drive
the mixer core.
Table 3. Single-Ended LO Input Impedance
(at Pin 22, No External Match)
REFLECTION COEFFICIENT
FREQUENCY
(MHz)
INPUT
IMPEDANCE
MAG
0.68
0.42
0.22
0.34
0.35
0.36
0.35
0.26
0.24
0.15
ANGLE
–125
–179
–7.7
750
63.3||–j30.5
20.3||–j1120
78.4||–j1250
79.1||–j113
74.7||–j96.3
66.8||–j81.5
53.8||–j69.8
33.7||–j115
33.0||–j146
43.9||+j173
The measured return loss of the LO input port is shown
in Figure 5 for an LO input power of –1dBm. The imped-
ance match is acceptable from about 1.1GHz to beyond
4GHz, with a minimum return loss across this range of
about 9dB at 2300MHz. If desired, the return loss can
be improved below 1.1GHz by external components as
shown in Figure 4. The return loss can also be improved
by reducing the LO drive level, though performance will
degrade if the level is too low.
1000
1500
1900
2000
2150
2400
3050
3150
4000
–65.2
–74.7
–87.0
–105
–148
–154
–123
EXTERNAL
MATCHING
FOR LOW
FREQUENCY
ONLY
0
V
CC
LO
INPUT
–5
–10
–15
–20
–25
L6
LO
22
C13
V
BIAS
5579 F04
Figure 4. LO Input Circuit
500 1000 1500 2000 2500 3000 3500 4000
FREQUENCY (MHz)
5579 F05
Figure 5. LO Input Return Loss
5579f
14
LT5579
APPLICATIONS INFORMATION
RF Output Interface
Table 4. Single-Ended RF Output Impedance
(at Pin 15, No External Matching)
The RF output interface is shown in Figure 6. An internal
RF transformer reduces the mixer core output impedance
to simplify matching of the RF output pin. A center tap in
the transformer provides the DC connection to the mixer
core and the transformer provides DC isolation to the RF
output. The RF pin is internally grounded through the
secondary winding of the transformer, thus a DC voltage
should not be applied to this pin.
REFLECTION COEFFICIENT
FREQUENCY
(MHz)
RF OUTPUT
IMPEDANCE
MAG
0.78
0.62
0.52
0.42
0.34
0.30
0.45
ANGLE
97.4
1250
1750
1950
2150
2300
2600
3600
11.0+j42.7
55.6+j83.4
119+j62.4
116–j21.0
73.7–j37.7
35.2–j21.5
21.9+j17.8
47.8
21.9
–10.4
–40.9
–110
134
While the LT5579 performs best at frequencies above
1500MHz, the part can be used down to 900MHz. The
internal RF transformer is not optimized for these lower
frequencies, thusthegainandimpedancematchingband-
widthwilldecreaseduetothelowtransformerinductance.
The impedance data for the RF output, listed in Table 4,
can be used to develop matching networks for different
frequencies or load impedances. Figure 7 illustrates the
output return loss performance for several applications.
The component values and approximate matching band-
widths are listed in Table 5.
Table 5. RF Output Component Values
FREQUENCY
(MHz)
1650
1750
1950
2140
2600
3600
C8 (pF)
L3 (nH)
MATCH BW (at 12dB RL)
1630 to 1770
1.5
6.8
1.2
6.8
1725 to 1870
1
4.7
1840 to 2020
0.45
0.45
0.7
3.9
2035 to 2285
1.8
2260 to 2780*
3170 to 4100*
0ꢀ
*10dB Return Loss bandwidth
DC and RF Grounding
0
The LT5579 relies on the back side ground for both RF and
thermal performance. The Exposed Pad must be soldered
to the low impedance topside ground plane of the board.
Several vias should connect the topside ground to other
ground layers to aid in thermal dissipation.
–5
–10
–15
–20
c
LT5579
d
RF
50Ω
a
b
L3
–25
1500
15
2000
2500
3000
3500
4000
C8
FREQUENCY (MHz)
5579 F07
Figure 7. RF Output Return Loss with 1750MHz (a),
2140MHz (b), 2600MHz (c) and 3600MHz (d) Matching
5579 F06
8
9
10
11
V
CC
Figure 6. RF Output Circuit
5579f
15
LT5579
TYPICAL APPLICATIONS
The following examples illustrate the implementation
and performance of the LT5579 in different frequency
configurations. These circuits were evaluated using the
circuit board shown in Figure 12.
12.5Ω. The relatively low input frequency demanded the
use of 4.7nH chip inductors instead of short transmission
lines.
Closer to the IC input, 47pF capacitors were used instead
ofasingledifferentialcapacitor(C3inFigure1), becauseit
was found that the addition of common mode capacitance
improved the high side LO performance in this applica-
tion. The value of these 47pF capacitors was selected to
resonate with the 100nH inductors at 70MHz. Note that
adding common mode capacitance does not improve
performance with all frequency configurations.
1650MHz Application
In this case, the LT5579 was evaluated while tuned for an
IF of 70MHz and an RF output of 1650MHz. The matching
configuration is shown in Figure 8.
Input capacitors are used only as DC blocks in this ap-
plication. The 4.7nH inductors and the 120pF capacitor
transformtheinputimpedanceoftheICuptoapproximately
9.1Ω
100nH
LO
47pF
MABAES0061
4:1
1nF
1nF
4.7nH
RF
1650MHz
6.8nH
IF
70MHz
120pF
4.7nH
47pF
1.5pF
5579 F08
100nH
9.1Ω
Figure 8. IF Input Tuned for 70MHz
5579f
16
LT5579
TYPICAL APPLICATIONS
The RF port impedance match was realized with C8 =
1.5pF and L3 = 6.8nH. The optimum impedance match
was purposefully shifted high in order to achieve better
OIP3 performance at the desired frequency.
1950MHz Application
In this example, a high side LO was used to convert the IF
input signal at 240MHz to 1950MHz at the RF output. The
RF port impedance match was realized with C8 = 1pF and
L3 = 4.7nH. As in the 1650MHz case, it was found that
tuning the output match slightly high in frequency gave
better OIP3 results at the desired frequency. The input
match for 240MHz operation is the same as described in
the test circuit of Figure 1.
Figure 9 shows the measured conversion gain and OIP3
asafunctionofRFoutputfrequency. Asmentionedabove,
the output impedance match is shifted towards the high
sideoftheband,andthisisevidencedbythepositiveslope
of the gain. The single sideband noise figure across the
frequency range is also shown.
The measured 1950MHz performance is plotted in Fig-
ure 10 for both low side and high side LO drive. With this
matchingconfiguration,thelowsideLOcaseoutperforms
the high side LO. The gain, noise figure (SSB) and OIP3
are plotted as a function of RF output frequency.
Curves for both high side and low side LO cases are
shown. In this particular application, the low side OIP3
outperforms the high side case.
35
OIP3
35
30
25
OIP3
30
T
= 25°C
A
f
= 70MHz
IF
P
P
25
20
15
10
5
= –5dBm/TONE
IF
= –1dBm
LO
T
f
= 25°C
LOW SIDE LO
HIGH SIDE LO
A
= 240MHz
= –5dBm/TONE
IF
LOW SIDE LO
HIGH SIDE LO
20
15
10
5
P
IF
SSB NF
P
= –1dBm
LO
SSB NF
GAIN
GAIN
0
–5
1650
RF OUTPUT FREQUENCY (MHz)
1550
1600
1700
1750
0
1800
1850
1900
1950
2050
2000
RF OUTPUT FREQUENCY (MHz)
5579 F09
5579 F10
Figure 9. Gain, Noise Figure and OIP3 vs
RF Frequency with 70MHz IF and 1650MHz RF
Figure 10. Gain, Noise Figure and OIP3 vs
RF Frequency for the 1950MHz Application
5579f
17
LT5579
TYPICAL APPLICATIONS
30
25
20
15
10
5
2140MHz with Low Side LO
OIP3
The LT5579 was fully characterized with an RF output of
2140MHz and a high side LO. The part also works well
when driven with low side LO, however, the performance
benefited from the addition of common mode capacitance
to the IF input match. A 10pF capacitor to ground was
added to each IF pin. These capacitors were attached
near inductors L1 and L2. The measured performance is
shown in Figure 11.
T
= 25°C
A
f
= 240MHz
IF
P
P
= –5dBm/TONE
IF
= –1dBm
LO
f
= f + f
RF IF LO
SSB NF
GAIN
0
2000
2100 2150 2200 2250 2300
2050
RF OUTPUT FREQUENCY (MHz)
5579 F11
Figure 11. Measured Performance when Tuned
for 240MHz IF, 2140MHz RF and Low Side LO
Figure 12. LT5579 Evaluation Board (DC1233A)
5579f
18
LT5579
PACKAGE DESCRIPTION
UH Package
24-Lead Plastic QFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1747 Rev Ø)
0.75 0.05
5.40 0.05
3.90 0.05
3.20 0.05
3.25 REF
3.20 0.05
PACKAGE OUTLINE
0.30 0.05
0.65 BSC
PIN 1 NOTCH
R = 0.30 TYP
OR 0.35 s 45°
CHAMFER
RECOMMENDED SOLDER PAD LAYOUT
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
BOTTOM VIEW—EXPOSED PAD
R = 0.115
R = 0.05
TYP
0.75 0.05
5.00 0.10
TYP
23 24
0.00 – 0.05
0.55 0.10
PIN 1
TOP MARK
(NOTE 6)
1
2
3.20 0.10
5.00 0.10
3.25 REF
3.20 0.10
(UH24) QFN 1206 REV Ø
0.200 REF
0.30 0.05
0.65 BSC
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
5579f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
19
LT5579
RELATED PARTS
PART NUMBER
Infrastructure
LT5514
DESCRIPTION
COMMENTS
Ultralow Distortion, IF Amplifier/ADC Driver
with Digitally Controlled Gain
40MHz to 900MHz Quadrature Demodulator
1.5GHz to 2.4GHz High Linearity Direct
Quadrature Modulator
850MHz Bandwidth, 47dBm OIP3 at 100MHz, 10.5dB to 33dB Gain Control Range
21dBm IIP3, Integrated LO Quadrature Generator
LT5517
LT5518
22.8dBm OIP3 at 2GHz, –158.2dBm/Hz Noise Floor, 50Ω Single-Ended RF and LO
Ports, 4-Channel W-CDMA ACPR = –64dBc at 2.14GHz
LT5519
LT5520
LT5521
LT5522
LT5524
LT5525
LT5526
LT5527
LT5528
LT5557
LT5558
0.7GHz to 1.4GHz High Linearity Upconverting
Mixer
17.1dBm IIP3 at 1GHz, Integrated RF Output Transformer with 50Ω Matching,
Single-Ended LO and RF Ports Operation
1.3GHz to 2.3GHz High Linearity Upconverting
Mixer
15.9dBm IIP3 at 1.9GHz, Integrated RF Output Transformer with 50Ω Matching,
Single-Ended LO and RF Ports Operation
24.2dBm IIP3 at 1.95GHz, NF = 12.5dB, 3.15V to 5.25V Supply, Single-Ended LO
Port Operation
10MHz to 3700MHz High Linearity
Upconverting Mixer
400MHz to 2.7GHz High Signal Level
Downconverting Mixer
4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz, NF = 12.5dB, 50Ω Single-Ended RF
and LO Ports
450MHz Bandwidth, 40dBm OIP3, 4.5dB to 27dB Gain Control
Low Power, Low Distortion ADC Driver with
Digitally Programmable Gain
High Linearity, Low Power Downconverting
Mixer
High Linearity, Low Power Downconverting
Mixer
400MHz to 3.7GHz High Signal Level
Downconverting Mixer
Single-Ended 50Ω RF and LO Ports, 17.6dBm IIP3 at 1900MHz, I = 28mA
CC
3V to 5.3V Supply, 16.5dBm IIP3, 100kHz to 2GHz RF, NF = 11dB, I = 28mA,
CC
–65dBm LO-RF Leakage
IIP3 = 23.5dBm and NF = 12.5dBm at 1900MHz, 4.5V to 5.25V Supply, I = 78mA,
CC
Conversion Gain = 2dB
1.5GHz to 2.4GHz High Linearity Direct
Quadrature Modulator
21.8dBm OIP3 at 2GHz, –159.3dBm/Hz Noise Floor, 50Ω, 0.5V Baseband
DC
Interface, 4-Channel W-CDMA ACPR = –66dBc at 2.14GHz
400MHz to 3.8GHz 3.3V Downconverting Mixer IIP3 = 23.5dBm at 3.6GHz, NF = 15.4dB, Conversion Gain = 1.7dB, 3.3V Supply at
82mA, Single-Ended RF and LO Inputs
600MHz to 1100MHz High Linearity Direct
Quadrature Modulator
22.4dBm OIP3 at 900MHz, –158dBm/Hz Noise Floor, 3kΩ, 2.1V Baseband
DC
Interface, 3-Ch CDMA2000 ACPR = –70.4dBc at 900MHz
LT5560
LT5568
Ultra-Low Power Active Mixer
700MHz to 1050MHz High Linearity Direct
Quadrature Modulator
10mA Supply Current, 10dBm IIP3, 10dB NF, Usable as Up- or Down-Converter.
22.9dBm OIP3 at 850MHz, –160.3dBm/Hz Noise Floor, 50Ω, 0.5V Baseband
DC
Interface, 3-Ch CDMA2000 ACPR = –71.4dBc at 850MHz
LT5572
LT5575
1.5GHz to 2.5GHz High Linearity Direct
Quadrature Modulator
700MHz to 2.7GHz Direct Conversion I/Q
Demodulator
21.6dBm OIP3 at 2GHz, –158.6dBm/Hz Noise Floor, High-Ohmic 0.5V Baseband
DC
Interface, 4-Ch W-CDMA ACPR = –67.7dBc at 2.14GHz
Integrated Baluns, 28dBm IIP3, 13dBm P1dB, 0.03dB I/Q Amplitude Match,
0.4° Phase Match
RF Power Detectors
LTC®5505
LTC5507
LTC5508
LTC5509
RF Power Detectors with >40dB Dynamic Range 300MHz to 3GHz, Temperature Compensated, 2.7V to 6V Supply
100kHz to 1000MHz RF Power Detector
300MHz to 7GHz RF Power Detector
300MHz to 3GHz RF Power Detector
100kHz to 1GHz, Temperature Compensated, 2.7V to 6V Supply
44dB Dynamic Range, Temperature Compensated, SC70 Package
36dB Dynamic Range, Low Power Consumption, SC70 Package
LTC5530
LTC5531
LTC5532
300MHz to 7GHz Precision RF Power Detector Precision V
300MHz to 7GHz Precision RF Power Detector Precision V
300MHz to 7GHz Precision RF Power Detector Precision V
Offset Control, Shutdown, Adjustable Gain
Offset Control, Shutdown, Adjustable Offset
Offset Control, Adjustable Gain and Offset
OUT
OUT
OUT
LT5534
50MHz to 3GHz Log RF Power Detector with
60dB Dynamic Range
1dB Output Variation over Temperature, 38ns Response Time, Log Linear
Response
LTC5536
Precision 600MHz to 7GHz RF Power Detector 25ns Response Time, Comparator Reference Input, Latch Enable Input,
with Fast Comparator Output
–26dBm to +12dBm Input Range
LT5537
LT5570
Wide Dynamic Range Log RF/IF Detector
2.7GHz Mean-Squared Detector
Low Frequency to 1GHz, 83dB Log Linear Dynamic Range
0.5dB Accuracy Over Temperature and >50dB Dynamic Range, Fast 500ns
Rise Time
5579f
LT 0108 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
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© LINEAR TECHNOLOGY CORPORATION 2008
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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