SA5204D-T [NXP]

RF/Microwave Amplifier, 0 MHz - 350 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER, PLASTIC, SO-8;
SA5204D-T
型号: SA5204D-T
厂家: NXP    NXP
描述:

RF/Microwave Amplifier, 0 MHz - 350 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER, PLASTIC, SO-8

放大器
文件: 总13页 (文件大小:119K)
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INTEGRATED CIRCUITS  
SA5204A  
Wide-band high-frequency amplifier  
Product specification  
Replaces data of Feb 25, 1992  
1997 Nov 07  
IC17 Data Handbook  
Philip s Se m ic ond uc tors  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
DESCRIPTION  
PIN CONFIGURATION  
The SA5204A family of wideband amplifiers replaces the SA5204  
family. The ‘A’ parts are fabricated on a rugged 2µm bipolar process  
featuring excellent statistical process control. Electrical  
performance is nomically identical to the original parts.  
D Packages  
1
2
3
4
8
7
6
5
V
V
CC  
CC  
20dB  
The SA5204A is a high-frequency amplifier with a fixed insertion  
gain of 20dB. The gain is flat to ±0.5dB from DC to 200MHz. The  
-3dB bandwidth is greater than 350MHz. This performance makes  
the amplifier ideal for cable TV applications. The SA5204A operates  
with a single supply of 6V, and only draws 25mA of supply current,  
which is much less than comparable hybrid parts. The noise figure is  
4.8dB in a 75system and 6dB in a 50system.  
V
V
IN  
OUT  
GND  
GND  
GND  
GND  
TOP VIEW  
SR00193  
Figure 1. Pin Configuration  
The SA5204A is a relaxed version of the SA5205. Minimum  
guaranteed bandwidth is relaxed to 350MHz and the “S” parameter  
Min/Max limits are specified as typicals only.  
FEATURES  
Bandwidth (min.)  
200 MHz, ±0.5dB  
350 MHz, -3dB  
Until now, most RF or high-frequency designers had to settle for  
discrete or hybrid solutions to their amplification problems. Most of  
these solutions required trade-offs that the designer had to accept in  
order to use high-frequency gain stages. These include high power  
consumption, large component count, transformers, large packages  
with heat sinks, and high part cost. The SA5204A solves these  
problems by incorporating a wideband amplifier on a single  
monolithic chip.  
20dB insertion gain  
4.8dB (6dB) noise figure Z =75(Z =50)  
O
O
No external components required  
Input and output impedances matched to 50/75systems  
Surface-mount package available  
Cascadable  
The part is well matched to 50 or 75input and output impedances.  
The standing wave ratios in 50 and 75systems do not exceed 1.5  
on either the input or output over the entire DC to 350MHz operating  
range.  
2000V ESD protection  
Since the part is a small, monolithic IC die, problems such as stray  
capacitance are minimized. The die size is small enough to fit into a  
very cost-effective 8-pin small-outline (SO) package to further  
reduce parasitic effects.  
APPLICATIONS  
Antenna amplifiers  
No external components are needed other than AC-coupling  
capacitors because the SA5204A is internally compensated and  
matched to 50 and 75. The amplifier has very good distortion  
specifications, with second and third-order intermodulation  
intercepts of +24dBm and +17dBm, respectively, at 100MHz.  
Amplified splitters  
Signal generators  
Frequency counters  
Oscilloscopes  
Signal analyzers  
Broadband LANs  
Networks  
The part is well matched for 50test equipment such as signal  
generators, oscilloscopes, frequency counters, and all kinds of  
signal analyzers. Other applications at 50include mobile radio, CB  
radio, and data/video transmission in fiber optics, as well as  
broadband LANs and telecom systems. A gain greater than 20dB  
can be achieved by cascading additional SA5204As in series as  
required, without any degradation in amplifier stability.  
Modems  
Mobile radio  
Security systems  
Telecommunications  
ORDERING INFORMATION  
DESCRIPTION  
TEMPERATURE RANGE  
ORDER CODE  
DWG #  
8-Pin Plastic Small Outline (SO) package  
–40 to +85°C  
SA5204AD  
SOT96-1  
2
853-1599 18662  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
ABSOLUTE MAXIMUM RATINGS  
SYMBOL  
PARAMETER  
RATING  
UNIT  
V
CC  
V
IN  
Supply voltage  
9
5
V
AC input voltage  
V
P–P  
T
A
Operating ambient temperature range  
SA grade  
–40 to +85  
°C  
1, 2  
Maximum power dissipation  
P
DMAX  
T =25°C(still–air)  
A
D package  
780  
150  
mW  
°C  
T
T
Junction temperature  
Storage temperature range  
J
–55 to +150  
°C  
STG  
Lead temperature  
(soldering 60s)  
T
SOLD  
300  
°C  
NOTES:  
1. Derate above 25°C, at the following rates  
D package at 6.2mW/°C  
2. See “Power Dissipation Considerations” section.  
EQUIVALENT SCHEMATIC  
V
CC  
R
R
2
1
2
R
0
Q
V
3
OUT  
Q
6
Q
V
Q
1
Q
IN  
R
4
3
R
F1  
R
E2  
R
E1  
Q
5
R
F2  
SR00194  
Figure 2. Equivalent Schematic  
3
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
DC ELECTRICAL CHARACTERISTICS  
V
CC  
=6V, Z =Z =Z =50and T =25°C, in all packages, unless otherwise specified.  
S
L
O
A
LIMITS  
Typ  
SYMBOL  
PARAMETER  
TEST CONDITIONS  
UNIT  
Max  
Min  
5
V
CC  
Operating supply voltage range  
Supply current  
Over temperature  
Over temperature  
f=100MHz, over temperature  
f=100MHz  
8
V
I
19  
16  
25  
19  
33  
22  
mA  
dB  
CC  
S21  
Insertion gain  
25  
S11  
Input return loss  
Output return loss  
Isolation  
dB  
dB  
dB  
DC –550MHz  
f=100MHz  
12  
27  
S22  
S12  
DC –550MHz  
f=100MHz  
12  
–25  
–18  
350  
550  
4.8  
6.0  
+7.0  
+4.0  
DC –550MHz  
±0.5dB  
BW  
BW  
Bandwidth  
200  
350  
MHz  
MHz  
dB  
Bandwidth  
–3dB  
Noise figure (75)  
Noise figure (50)  
Saturated output power  
1dB gain compression  
f=100MHz  
f=100MHz  
dB  
f=100MHz  
dBm  
dBm  
f=100MHz  
Third–order intermodulation inter-  
cept (output)  
f=100MHz  
f=100MHz  
+17  
+24  
dBm  
dBm  
Second–order intermodulation inter-  
cept (output)  
t
t
Rise time  
500  
500  
ps  
ps  
R
Propagation delay  
P
9
8
7
6
5
35  
34  
32  
30  
Z
= 50  
O
o
v
= 8v  
T
= 25 C  
cc  
cc  
cc  
A
o
T
= 25 C  
A
28  
26  
v
v
= 7v  
= 6v  
24  
22  
20  
v
= 5v  
cc  
18  
16  
5
5.5  
6
6.5  
7
7.5  
8
1
2
4
6
8
2
2
4
6
8
10  
3
10  
10  
SUPPLY VOLTAGE—V  
FREQUENCY—MHz  
SR00195  
SR00196  
Figure 3. Supply Current vs Supply Voltage  
Figure 4. Noise Figure vs Frequency  
4
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
25  
10  
9
V
8V  
CC =  
8
7
v
= 8v  
cc  
= 7v  
v
cc  
6
5
4
3
2
V
6V  
CC =  
20  
15  
V
7V  
V
5V  
CC =  
CC =  
v
2
= 6v  
1
0
–1  
cc  
v
= 5v  
cc  
–2  
Z
T
= 50Ω  
Z
= 50Ω  
O
A
O
–3  
–4  
–5  
–6  
o
o
= 25 C  
T
= 25 C  
A
10  
1
2
4
6
8
2
4
6
8
3
10  
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
10  
10  
FREQUENCY—MHz  
FREQUENCY—MHz  
SR00197  
SR00198  
Figure 5. Insertion Gain vs Frequency (S  
)
Figure 8. 1dB Gain Compression vs Frequency  
21  
40  
35  
30  
25  
25  
o
T
= 55 C  
o
A
T
= 25 C  
A
20  
15  
o
= 85 C  
T
A
Z
= 50Ω  
20  
15  
10  
T
=
O
Ao  
o
T
= 25 C  
125 C  
A
V
Z
= 8V  
CC  
O
= 50Ω  
10  
1
2
4
6
8
2
2
4
6
8
3
4
5
6
7
8
9
10  
10  
10  
10  
FREQUENCY—MHz  
POWER SUPPLY VOLTAGE—V  
SR00199  
SR00200  
Figure 6. Insertion Gain vs Frequency (S  
)
Figure 9. Second-Order Output Intercept vs Supply Voltage  
21  
30  
25  
11  
10  
9
8
7
6
5
4
20  
V
V
= 7V  
= 6V  
CC  
CC  
CC  
3
2
1
0
Z
= 50Ω  
O
15  
10  
V
8
= 8V  
CC  
V
= 5V  
o
T
= 25 C  
A
–1  
–2  
–3  
–4  
–5  
–6  
Z
= 50Ω  
O
A
o
T
= 25 C  
5
4
5
6
7
8
9
10  
1
2
4
6
2
2
4
6
8
3
10  
10  
10  
POWER SUPPLY VOLTAGE—V  
FREQUENCY—MHz  
SR00201  
SR00202  
Figure 7. Saturated Output Power vs Frequency  
Figure 10. Third-Order Intercept vs Supply Voltage  
5
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
2.0  
10  
1.9  
o
T
= 25 C  
= 6V  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
A
CC  
–15  
Z
T
= 50Ω  
O
A
V
o
= 25 C  
.
V
= 6V  
CC  
–20  
–25  
Z
Z
= 75Ω  
= 50Ω  
O
O
–30  
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
FREQUENCY—MHz  
FREQUENCY—MHz  
SR00203  
SR00204  
Figure 11. Input VSWR vs Frequency  
Figure 14. Isolation vs Frequency (S )  
12  
25  
20  
2.0  
v
= 8v  
cc  
= 7v  
1.9  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
v
cc  
o
T
= 25 C  
= 6V  
amb  
CC  
V
v
= 6v  
cc  
v
= 5v  
15  
10  
cc  
Z
Z
= 75Ω  
= 50Ω  
2
Z
T
= 75Ω  
O
O
O
A
o
= 25 C  
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
FREQUENCY—MHz  
1
4
6
8
2
2
4
6
8
3
10  
10  
10  
FREQUENCY—MHz  
SR00205  
SR00206  
Figure 12. Output VSWR vs Frequency  
Figure 15. Insertion Gain vs Frequency (S )  
21  
25  
40  
o
T
= –55 C  
o
A
35  
30  
T
= 25 C  
A
20  
15  
10  
OUTPUT  
25  
20  
o
= 85 C  
T
A
T
=
Ao  
125 C  
V
Z
= 6V  
CC  
O
= 50Ω  
INPUT  
Z
= 75Ω  
o
O
T
= 25 C  
A
V
= 6V  
15  
10  
CC  
1
2
4
6
8
2
2
4
6
8
10  
3
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
10  
FREQUENCY—MHz  
10  
FREQUENCY—MHz  
SR00207  
SR00208  
Figure 13. Input (S ) and Output (S ) Return Loss  
Figure 16. Insertion Gain vs Frequency (S )  
21  
11  
22  
vs Frequency  
6
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
eliminates problems of shunt-feedback loading on the output. The  
THEORY OF OPERATION  
value of R =140is chosen to give the desired nominal gain. The  
F1  
The design is based on the use of multiple feedback loops to  
provide wide-band gain together with good noise figure and terminal  
impedance matches. Referring to the circuit schematic in Figure 17,  
the gain is set primarily by the equation:  
DC output voltage V  
can be determined by:  
OUT  
V =V –(I +I )R2,(4)  
OUT CC C2 C6  
where V =6V, R =225, I =8mA and I =5mA.  
CC  
2
C2  
C6  
VOUT  
From here, it can be seen that the output voltage is approximately  
3.1V to give relatively equal positive and negative output swings.  
(1)  
+ (RF1 ) RE1) ń RE1  
VIN  
Diode Q is included for bias purposes to allow direct coupling of  
5
which is series-shunt feedback. There is also shunt-series feedback  
R
to the base of Q . The dual feedback loops stabilize the DC  
1
F2  
due to R and R which aids in producing wide-band terminal  
F2  
E2  
operating point of the amplifier.  
impedances without the need for low value input shunting resistors  
that would degrade the noise figure. For optimum noise  
The output stage is a Darlington pair (Q and Q ) which increases  
6
2
the DC bias voltage on the input stage (Q ) to a more desirable  
performance, R and the base resistance of Q are kept as low as  
1
E1  
1
value, and also increases the feedback loop gain. Resistor R  
possible, while R is maximized.  
0
F2  
optimizes the output VSWR (Voltage Standing Wave Ratio).  
The noise figure is given by the following equation:  
Inductors L and L are bondwire and lead inductances which are  
1
2
roughly 3nH. These improve the high-frequency impedance  
matches at input and output by partially resonating with 0.5pF of pad  
and package capacitance.  
KT  
2qlC1  
ȡ
ȣ
ƪr  
ƫ
b ) RE1  
)
(2)  
NF + 10Log 1 )  
dB  
ȧ
ȧ
Ȥ
RO  
Ȣ
POWER DISSIPATION CONSIDERATIONS  
When using the part at elevated temperature, the engineer should  
consider the power dissipation capabilities.  
where I =5.5mA, R =12, r =130, KT/q=26mV at 25°C and  
R =50 for a 50system and 75 for a 75system.  
C1  
E1  
b
0
At the nominal supply voltage of 6V, the typical supply current is  
25mA (32mA max). For operation at supply voltages other than 6V,  
see Figure 3 for I versus V curves. The supply current is  
The DC input voltage level V can be determined by the equation:  
IN  
V
IN  
=V +(I +I ) R (3)  
BE1 C1 C3 E1  
CC  
CC  
inversely proportional to temperature and varies no more than 1mA  
between 25°C and either temperature extreme. The change is 0.1%  
per °C over the range.  
where R =12, V =0.8V, I =5mA and I =7mA (currents rated  
E1  
BE  
C1  
C3  
at V =6V).  
CC  
Under the above conditions, V is approximately equal to 1V.  
IN  
The recommended operating temperature ranges are air-mount  
specifications. Better heat-sinking benefits can be realized by  
mounting the SO package body against the PC board plane.  
Level shifting is achieved by emitter-follower Q and diode Q ,  
3
4
which provide shunt feedback to the emitter of Q via R . The use  
1
F1  
of an emitter-follower buffer in this feedback loop essentially  
V
CC  
R2  
225  
R1  
650  
L2  
R0  
10  
V
Q3  
OUT  
3nH  
Q6  
Q2  
L1  
V
IN  
Q4  
Q1  
R3  
140  
3nH  
RF1  
140  
RE2  
12  
RE1  
12  
Q5  
RF2  
200  
SR00209  
Figure 17. Schematic Diagram  
7
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
PC BOARD MOUNTING  
In order to realize satisfactory mounting of the SA5204A to a PC  
board, certain techniques need to be utilized. The board must be  
double-sided with copper and all pins must be soldered to their  
Actual S-parameter measurements using an HP network analyzer  
(model 8505A) and an HP S-parameter tester (models 8503A/B) are  
shown in Figure 20.  
respective areas (i.e., all GND and V pins on the package). The  
CC  
Values for the figures below are measured and specified in the data  
sheet to ease adaptation and comparison of the SA5204A to other  
high-frequency amplifiers.  
power supply should be decoupled with a capacitor as close to the  
V
CC  
pins as possible, and an RF choke should be inserted between  
the supply and the device. Caution should be exercised in the  
connection of input and output pins. Standard microstrip should be  
observed wherever possible. There should be no solder bumps or  
burrs or any obstructions in the signal path to cause launching  
problems. The path should be as straight as possible and lead  
lengths as short as possible from the part to the cable connection.  
Another important consideration is that the input and output should  
The most important parameter is S . It is defined as the square root  
21  
of the power gain, and, in decibels, is equal to voltage gain as  
shown below:  
Z =Z =Z  
for the SA5204A  
D
IN OUT  
2
2
SA5204A  
VOUT  
ZD  
VIN  
be AC-coupled. This is because at V =6V, the input is  
POUT )  
CC  
PIN  
)
ZD  
approximately at 1V while the output is at 3.1V. The output must be  
decoupled into a low-impedance system, or the DC bias on the  
output of the amplifier will be loaded down, causing loss of output  
power. The easiest way to decouple the entire amplifier is by  
soldering a high-frequency chip capacitor directly to the input and  
output pins of the device. This circuit is shown in Figure 18. Follow  
these recommendations to get the best frequency response and  
noise immunity. The board design is as important as the integrated  
circuit design itself.  
Z
D
2
VOUT  
ZD  
2
POUT  
PIN  
VOUT  
N
+
+
+ PI  
2
2
VIN  
VIN  
ZD  
2
P =V  
I
I
P =Insertion Power Gain  
I
V =Insertion Voltage Gain  
I
SCATTERING PARAMETERS  
Measured value for the  
The primary specifications for the SA5204A are listed as  
S-parameters. S-parameters are measurements of incident and  
reflected currents and voltages between the source, amplifier, and  
load as well as transmission losses. The parameters for a two-port  
network are defined in Figure 19.  
2
SA5204A = |S  
|
= 100  
21  
POUT  
2
NPI  
and VI  
In decibels:  
+
+ | S21  
|
+ 100  
PIN  
VOUT  
Ǹ
+
+
PI + S21 + 10  
VIN  
V
CC  
2
P
I(dB)  
V
I(dB)  
=10 Log | S  
|
21  
= 20dB  
RF CHOKE  
= 20 Log S = 20dB  
21  
DECOUPLING  
CAPACITOR  
P
I(dB)  
= V  
= S  
= 20dB  
I(dB)  
21(dB)  
Also measured on the same system are the respective voltage  
standing wave ratios. These are shown in Figure 21. The VSWR  
can be seen to be below 1.5 across the entire operational frequency  
range.  
5204A  
V
V
IN  
OUT  
AC  
AC  
COUPLING  
CAPACITOR  
COUPLING  
CAPACITOR  
Relationships exist between the input and output return losses and  
the voltage standing wave ratios. These relationships are as follows:  
SR00210  
Figure 18. Circuit Schematic for  
Coupling and Power Supply Decoupling  
8
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
POWER REFLECTED  
FROM INPUT PORT  
S
— INPUT RETURN LOSS  
S
=
11  
11  
POWER AVAILABLE FROM  
S
21  
GENERATOR AT INPUT PORT  
REVERSE TRANSDUCER  
POWER GAIN  
S
=
S
S
— REVERSE TRANSMISSION LOSS  
OSOLATION  
12  
12  
21  
22  
S
S
22  
11  
S
=
TRANSDUCER POWER GAIN  
— FORWARD TRANSMISSION LOSS  
OR INSERTION GAIN  
21  
POWER REFLECTED  
FROM OUTPUT PORT  
S
12  
S
— OUTPUT RETURN LOSS  
S
=
22  
POWER AVAILABLE FROM  
GENERATOR AT OUTPUT PORT  
a. Two-Port Network Defined  
b.  
SR00211  
Figure 19.  
9
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
50System  
75System  
25  
20  
25  
v
= 8v  
cc  
= 7v  
v
= 8v  
v
cc  
= 7v  
cc  
v
cc  
20  
15  
v
= 6v  
cc  
v
v
2
= 6v  
cc  
= 5v  
15  
10  
cc  
v
= 5v  
cc  
Z
T
= 75Ω  
O
A
Z
T
= 50Ω  
O
A
o
= 25 C  
o
= 25 C  
10  
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
1
2
4
6
8
2
4
6
8
3
10  
10  
10  
FREQUENCY—MHz  
FREQUENCY—MHz  
a. Insertion Gain vs Frequency (S  
)
b. Insertion Gain vs Frequency (S )  
21  
21  
10  
10  
–15  
–15  
Z
T
= 50Ω  
Z
T
= 75Ω  
O
A
O
A
o
o
= 25 C  
= 25 C  
V
= 6V  
V
= 6V  
CC  
CC  
–20  
–25  
–30  
–20  
–25  
–30  
1
2
4
6
8
2
2
4
6
8
3
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
FREQUENCY—MHz  
10  
10  
10  
FREQUENCY—MHz  
c. Isolation vs Frequency (S  
)
d. S Isolation vs Frequency  
12  
12  
40  
35  
30  
40  
35  
30  
OUTPUT  
OUTPUT  
25  
20  
25  
20  
V
Z
= 6V  
CC  
= 50Ω  
O
INPUT  
INPUT  
V
Z
= 6V  
CC  
o
T
= 25 C  
A
15  
10  
= 75Ω  
15  
10  
O
o
T
= 25 C  
A
1
2
4
6
8
2
2
4
6
8
3
10  
1
2
4
6
8
2
2
4
6
8
3
10  
10  
10  
10  
10  
FREQUENCY—MHz  
FREQUENCY—MHz  
e. Input (S ) and Output (S ) Return Loss  
f. Input (S ) and Output (S ) Return Loss  
11 22  
11  
22  
vs Frequency  
vs Frequency  
SR00212  
Figure 20.  
INPUT RETURN LOSS=S dB  
1dB from its low power value. The decrease is due to nonlinearities  
in the amplifier, an indication of the point of transition between  
small-signal operation and the large signal mode.  
11  
S
11  
dB=20 Log | S  
|
11  
OUTPUT RETURN LOSS=S dB  
22  
S
dB=20 Log | S  
|
The saturated output power is a measure of the amplifier’s ability to  
deliver power into an external load. It is the value of the amplifier’s  
output power when the input is heavily overdriven. This includes the  
sum of the power in all harmonics.  
22  
22  
INPUT VSWR=1.5  
OUTPUT VSWR=1.5  
INTERMODULATION INTERCEPT TESTS  
The intermodulation intercept is an expression of the low level  
linearity of the amplifier. The intermodulation ratio is the difference in  
dB between the fundamental output signal level and the generated  
distortion product level. The relationship between intercept and  
1DB GAIN COMPRESSION AND SATURATED  
OUTPUT POWER  
The 1dB gain compression is a measurement of the output power  
level where the small-signal insertion gain magnitude decreases  
10  
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
intermodulation ratio is illustrated in Figure 22, which shows product  
output levels plotted versus the level of the fundamental output for  
two equal strength output signals at different frequencies. The upper  
line shows the fundamental output plotted against itself with a 1dB to  
1dB slope. The second and third order products lie below the  
fundamentals and exhibit a 2:1 and 3:1 slope, respectively.  
second and third order intermodulation ratios in dB. The  
intermodulation intercept is an indicator of intermodulation  
performance only in the small signal operating range of the amplifier.  
Above some output level which is below the 1dB compression point,  
the active device moves into large-signal operation. At this point the  
intermodulation products no longer follow the straight line output  
slopes, and the intercept description is no longer valid. It is therefore  
The intercept point for either product is the intersection of the  
extensions of the product curve with the fundamental output.  
important to measure IP and IP at output levels well below 1dB  
2
3
compression. One must be careful, however, not to select too low  
levels because the test equipment may not be able to recover the  
signal from the noise. For the SA5204A we have chosen an output  
level of –10.5dBm with fundamental frequencies of 100.000 and  
100.01MHz, respectively.  
The intercept point is determined by measuring the intermodulation  
ratio at a single output level and projecting along the appropriate  
product slope to the point of intersection with the fundamental.  
When the intercept point is known, the intermodulation ratio can be  
determined by the reverse process. The second order IMR is equal  
to the difference between the second order intercept and the  
fundamental output level. The third order IMR is equal to twice the  
difference between the third order intercept and the fundamental  
output level. These are expressed as:  
ADDITIONAL READING ON SCATTERING  
PARAMETERS  
For more information regarding S-parameters, please refer to  
High-Frequency Amplifiers by Ralph S. Carson of the University of  
Missouri, Rolla, Copyright 1985; published by John Wiley & Sons,  
Inc.  
IP =P  
+IMR  
2
2
OUT  
OUT  
OUT  
IP =P  
3
+IMR /2  
3
“S-Parameter Techniques for Faster, More Accurate Network Design”,  
HP App Note 95-1, Richard W. Anderson, 1967, HP Journal.  
where P  
is the power level in dBm of each of a pair of equal  
level fundamental output signals, IP and IP are the second and  
2
3
“S-Parameter Design”, HP App Note 154, 1972.  
third order output intercepts in dBm, and IMR and IMR are the  
2
3
2.0  
1.9  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
2.0  
1.9  
o
T
= 25 C  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
o
= 25 C  
A
T
V
amb  
CC  
V
= 6V  
CC  
= 6V  
.
Z
= 75Ω  
= 50Ω  
O
Z
Z
= 75Ω  
= 50Ω  
O
O
Z
O
1
2
4
6
8
2
2
4
6 8  
3
1
2
4
6
8
2
2
4
6 8  
3
10  
10  
10  
FREQUENCY—MHz  
10  
10  
10  
FREQUENCY—MHz  
a. Input VSWR vs Frequency  
b. Output VSWR vs Frequency  
SR00213  
Figure 21. Input/Output VSWR vs Frequency  
+30  
+20  
THIRD ORDER  
INTERCEPT POINT  
2ND ORDER  
INTERCEPT  
POINT  
1dB  
COMPRESSION POINT  
+10  
0
FUNDAMENTAL  
RESPONSE  
-10  
-20  
-30  
-40  
2ND ORDER  
RESPONSE  
3RD ORDER  
RESPONSE  
-60  
-50  
-40  
-30  
-20  
-10  
0
+10  
+20  
+30  
+40  
INPUT LEVEL dBm  
SR00214  
Figure 22.  
11  
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
SO8: plastic small outline package; 8 leads; body width 3.9mm  
SOT96-1  
12  
1997 Nov 07  
Philips Semiconductors  
Product specification  
Wide-band high-frequency amplifier  
SA5204A  
DEFINITIONS  
Data Sheet Identification  
Product Status  
Definition  
This data sheet contains the design target or goal specifications for product development. Specifications  
may change in any manner without notice.  
Objective Specification  
Formative or in Design  
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips  
Semiconductors reserves the right to make changes at any time without notice in order to improve design  
and supply the best possible product.  
Preliminary Specification  
Product Specification  
Preproduction Product  
Full Production  
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes  
at any time without notice, in order to improve design and supply the best possible product.  
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,  
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips  
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,  
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask  
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes  
only. PhilipsSemiconductorsmakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertesting  
or modification.  
LIFE SUPPORT APPLICATIONS  
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,  
orsystemswheremalfunctionofaPhilipsSemiconductorsandPhilipsElectronicsNorthAmericaCorporationProductcanreasonablybeexpected  
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips  
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully  
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.  
Philips Semiconductors  
811 East Arques Avenue  
P.O. Box 3409  
Copyright Philips Electronics North America Corporation 1997  
All rights reserved. Printed in U.S.A.  
Sunnyvale, California 94088–3409  
Telephone 800-234-7381  
Philips  
Semiconductors  

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