HMC504LC4B [HITTITE]
ACTIVE BIAS CONTROLLER; 有源偏置控制器
| 型号： | HMC504LC4B |
| 厂家： | 
HITTITE MICROWAVE CORPORATION |
| 描述： | ACTIVE BIAS CONTROLLER |
| 文件： | 总18页 (文件大小：692K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Typical Applications
Features
Automatic Gate voltage adjustment (No Calibration
required)
Supply Voltage: 4V to 12V
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
Digital Voltage: 3.3V to 5V
• Fiber Optic Modulator Driver Biasing
• CATV Laser Driver Biasing
• Cellular Base Station
Controls both Enhancement and Depletion type
devices
Adjustable Drain Current up to 200mA
Sink/Source Gate Current Capability
• Wireless Infrastructure Equipment
Optional Internal negative voltage generation that
can be disabled to use external negative rail
Fast Enable/Disable
13
Trigger-out Output for Daisy Chain Power-Up and
Power-Down Sequencing
Functional Diagram
General Description
HMC981 is an active bias controller that automatically
adjusts the gate voltage of an external amplifier
to achieve constant bias current. It can be used to
bias any enhancement and depletion type amplifiers
operating in Class-A regime with Drain voltages from
4V to 12V and drain currents up to 200mA, offering a
complete biasing solution.
HMC981 achieves excellent bias stability over supply,
temperature and process variations, and eliminates
the required calibration procedures usually employed
to prevent RF performance degradation due to such
variations.
All data shown herein is taken with appropriate probes.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 1
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Electrical Specifications, TA = +25°C, VDD=8V, VDIG= 3.3V, Depletion Master
Unless Otherwise Noted
Parameter
Symbol
Vdd
Conditions
Min.
4
Typ.
Max.
12
Units
V
Supply Voltage
EN = VDIG
7
3
mA
mA
mA
mA
mA
mA
V
VDD = 4V
VDD = 8V
EN = GND
EN = VDIG
EN = GND
VDD Quiescent Current
IDD
7.5
4
VDIG= 3.3 V
3
VDIG Quiescent Current
IDIG
VDIG= 5 V
5
Negative Voltage Output
Oscillator Frequency
Voltage Reference
VNEG
FOSC
VREF
-2.5
300
1.42
kHz
V
Vinlow
Vinhigh
Vinlow
Vinhigh
Vinlow
Vinhigh
1
1
1
V
Enable Input Threshold
Switch Input Threshold
ENTHRS
SWTHRS
DSCTHRS
13
1.4
1.4
1.4
V
V
V
V
Short Circuit Disable Input Threshold
VDRAIN Characteristics
V
SW=GND
SW=VDIG
20
80
80
mA
mA
%/V
%/C
V
DRAIN Current Adjustment Range
IDRAIN
200
DRAIN Current Change Over Digital Voltage
DRAIN Current Change Over Temperature
DRAIN Range
0.4
VDRAIN set to 8V,
IDRAIN set to 160 mA
ΔIDRAINV
0.02
VDRAIN
4
12
VDRAIN set to 8V,
IDRAIN set to 160 mA
VDRAIN Change Over Temperature
ΔVDRAIN
1.5
%/C
VNEG Characteristics
Negative Voltage Output
VNEG
INEG
-2.5
V
VDD= 4V
VDD= 8V
0
0
8
mA
mA
VNEG Current Sink
15
VGATE Characteristics
GATE Current Supply
VGATE Low Level
IG
-0.8
0.8
mA
V
VG_MIN
VG_MAX
VNEG
VGATE High Level
VNEG+4.5
V
VG2 Characteristics
VG2<1.5V
VG2>1.5V
-0.1
-1
0.1
1
mA
mA
V
VG2 Current Supply
IG2
VG2 Adjustment Range
VDIG Characteristics
Adjustment Range
VG2
1
VDD-1.3
VDIG
IDIG
3.3
5
V
VDD= 8 V,
VDIG Quiescent Current
SW Characteristics
3
mA
VDIG=EN =3.3 V
SW= GND
SW=VDIG
10
5
Ohm
Ohm
Internal Switch Resistance
RDS_ON
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 2
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Load Regulation @ VDD=6V, VDIG=3.3V,
SW=GND
Load Regulation @ VDD=8V,
SW=VDIG=3.3V
6.5
8.5
+25C
+85C
-55C
6
8
7.5
7
5.5
+25C
+85C
-55C
5
4.5
6.5
20
30
40
50
60
70
80
80
100
120
140
160
180
200
IDRAIN (mA)
IDRAIN (mA)
13
IDRAIN vs. VDIG[1][2]
VNEG Line Regulation vs. Supply Voltage
55
-2.45
No load condition
-2.47
54
53
52
51
50
+25C
+85C
-55C
-2.49
-2.51
-2.53
-2.55
+25C
+85C
-55C
3.3
3.7
4.1
4.5
4.9
4
6
8
10
12
VDIG (V)
SUPPLY VOLTAGE (V)
VNEG Load Regulation @ VDD=4V
VNEG Load Regulation @ VDD=12V
-2.3
-2.3
-2.4
-2.5
-2.4
-2.5
+25C
+85C
-55C
+25C
+85C
-55C
-2.6
-2.6
-2.7
-2.7
0
2
4
6
8
10
0
4
8
12
16
INEG (mA)
INEG (mA)
[1] IDRAIN is set to 53 mA
[2] HMC465LP5 is used as external amplifier
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 3
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Enable Waveform
Disable Waveform
8
8
6
4
6
4
2
2
0
0
-2
-4
-6
-8
-2
-4
-6
-8
EN
EN
VDRAIN
VDRAIN
VG2
VG2
VNEG
VGATE
VNEG
VGATE
12
14
16
18
20
0
2
4
6
8
10
12
TIME (ms)
TIME (ms)
13
Power Up Waveform
Shutdown Waveform
8
8
VDD
VDD
VDRAIN
6
4
6
VDRAIN
VDIG
VDIG
VG2
VG2
VNEG
VGATE
VNEG
VGATE
4
2
2
0
0
-2
-4
-2
-4
0
20
40
60
80
100
0
10
20
30
40
50
TIME (ms)
TIME (ms)
VNEG Load Transient VDD=4V
VNEG Load Transient VDD=6V
15
10
5
20
-2.4
-0.8
-2.425
-2.45
-2.475
-2.5
10
0
-1.3
-1.8
-2.3
-2.8
0
-5
-10
-20
-10
-15
-2.525
-2.55
0
0.5
1
1.5
2
0
0.5
1
1.5
2
TIME (ms)
TIME (ms)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 4
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
VGATE Load Regulation @ VDD=6V
VG2 Load Regulation @ VDD=6V
5
4.5
4
1
0.5
0
3.5
3
-0.5
-1
2.5
2
-1.5
1.5
+25C
-2
-2.5
-3
+85C
-55C
1
0.5
0
VG2=0.9V
VG2=1.78V
VG2=2.74V
VG2=3.71V
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
-1.25 -1 -0.75 -0.5 -0.25
0
0.25 0.5 0.75
1
1.25
IG2 (mA)
IG (mA)
13
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 5
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Absolute Maximum Ratings [1]
VDD
12V
Thermal Resistance (RTH
(Junction to package bottom)
)
52.1 °C/W
VG2_CONT, VDRAIN
-0.5V to VDD + 0.5V
-0.5V to VDIG + 0.5V
Storage Temperature
Operating Temperature
ESD Sensitivity (HBM)
-65 to +150 °C
-55 to +85 °C
Class 1B
SW, EN, CP_OUT, VGATEFB,
VNEGFB, TRIG_OUT, DISBL_SC,
ISENSE
VDIG
5.5V
Note that there are two different voltage domains on HMC981; a
high voltage domain Vdd, and a low voltage domain VDIG. Take
necessary precautions not to violate ABS MAX ratings of each
subdomains.
VNEG
-4V to GND
-0.5V to VDD + 0.5V
125 °C
VG2
Junction Temperature
Continuous Pdiss (T = 85 °C)
(Derate 19.19 mW/°C above 85 °C)
0.77 Watts
NOTES:
1. ALL DIMENSIONS IN INCHES [MILLIMETERS]
2. DIE THICKNESS IS 0.010 (0.254)
3. TYPICAL BOND PAD IS 0.0039 SQUARE
4. BOND PAD METALLIZATION: ALUMINUM
5. NO BACKSIDE METAL
13
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
6. NO CONNECTION REQUIRED FOR UNLABELED BOND PADS
7. OVERALL DIE SIZE IS .002
Outline Drawing
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 6
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Pad Descriptions
Pad Number
Function
Description
Interface Schematic
1, 5, 8, 10,
13, 15, 20,
23, 25, 26,
Die Bottom
These pads and the die bottom must be connected to a
high quality RF/DC ground.
GND
Enable pad. System is enabled when Ven is HIGH (VDIG).
If left floating, Ven defaults to HIGH (enabled).
2
3
EN
Internal switch resistance control pad. If left floating, VSW
SW
defaults to HIGH.
Disables short circuit lock down when pulled to ground.
Leave it floating to enable short circuit lock down.
12
4
DISBLSC
13
Control voltage of the VG2. Use a resistor divider between
VDD and GND to set the voltage. VG2 is typically 1.3V
lower than the VG2CONT
VG2CONT
19
VG2
Second gate control.
Bias supply pan. Connect supply voltage
to this pad with appropriate filtering.
6-7, 29-30
VDD, VDIG
1.5V reference voltage. 0.1uF or greater capacitor to GND
is needed for noise filtering.
9
VREF
To adjust the bias current of the external amplifier connect
a resistor (Rsense) from ISENSE pad to GND. Use Eqn.2
to
11
ISENSE
determine the required Rsense value.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 7
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Pad Descriptions (Continued)
Pad Number
Function
Description
Interface Schematic
Trigger out signal. Generates a HIGH (3.5V) signal when
the active bias system stabilizes. This signal can be
used to trigger next device (ENABLE) if more than one
HMC981 is used in a daisy chain.
14
TRGOUT
Drain voltage. Should be connected to the supply
terminal of the external amplifier. A minimum 100 nF
capacitor has to be placed close to the external amplifier to
improve load regulation.
16, 17
VDRAIN
13
Gate Control pad for external amplifier. Connect to the gate
(base) of the external amplifier. In order to guarantee
stability,a 10μF capacitor should be connected between
the gate (base) terminal of the external amplifier and GND
as close to the amplifier as possible.
18
VGATE
Negative input to the chip. Should be supplied with CPOUT
when negative voltage generator is enabled, or connect to
external VSS when negative voltage generator is enabled.
For detailed usage please refer to the “Negative Voltage
Generator” section.
21
22
VNEG
Feedback (Control) pad for Negative Voltage Generator
Charge Pump. Float to activate the negative voltage
generator / Sort to GND to disable the negative voltage
generator.
VNEGFB
Control pad for VGATEFB. Float VGATEFB when a
depletion mode transistor is biased. Selects the mode of
operation along with VNEGFB pad. For detailed usage
please refer to the Table 2.
24
VGATEFB
Negative voltage generator charge pump output. Negative
voltage generator needs a flying capacitor, a reservoir
capacitor and two diodes to operate. Please refer to the
application schematic for more info.
27, 28
CPOUT
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 8
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Application Circuit
13
Notes:
[1] Adjust R10 with respect to equation (2).
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 9
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Mounting & Bonding Techniques for MMICs
The die should be attached directly to the ground plane with epoxy (see HMC general Handling, Mounting , Bonding Note).
Handling Precautions
Follow these precautions to avoid permanent damage.
Storage: All bare die are placed in either Waffle or Gel based ESD protective containers, and then sealed in an ESD protective
bag for shipment. Once the sealed ESD protective bag has been opened, all die should be stored in a dry nitrogen environment.
Cleanliness: Handle the chips in a clean environment. DO NOT attempt to clean the chip using liquid cleaning systems.
Static Sensitivity: Follow ESD precautions to protect against ESD strikes.
Transients: Suppress instrument and bias supply transients while bias is applied. Use shielded signal and bias cables to minimize
inductive pick-up.
General Handling: The chip may be handled by a vacuum collet or with a sharp pair of tweezers.
Mounting
Epoxy Die Attach: Apply a minimum amount of epoxy to the mounting surface so that a thin epoxy fillet is observed around the
perimeter of the chip once it is placed into position. Cure epoxy per the manufacturer’s schedule.
13
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 10
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Application Notes
Detailed Description
The HMC981 is a fully-integrated Active Bias Controller (ABC) that automatically adjusts the gate voltage of amplifiers
operating in the Class-A regime. With an internal feedback the automatic gate voltage control achieves constant
quiescent bias through the amplifier under bias, independent of temperature and amplifier threshold variations. The
quiescent current is adjusted with a resistor connected externally. The HMC981 employs an integrated control circuitry
to achieve safe power-up and power-down sequencing of the targeted amplifier. The HMC981 can provide auto-bias
solution virtually any amplifier in the market (both enhancement and depletion type) with a quiescent current of up to
200 mA and a supply voltage of up to 12V.
The HMC981 has an integrated negative voltage generator to synthesize negative voltages required to drive depletion
mode amplifiers. If an external negative supply is already available or an enhancement mode device is targeted, the
negative voltage generator can be disabled.
13
The HMC981 achieves excellent bias stability over supply and temperature variations with low supply voltage down
to 4V. The gate control can both sink and source current ( 0.8 mA) to achieve constant bias current over input power
variations applied to the amplifier. The HMC981 also generates a second gate voltage (VG2). VG2 can be adjusted
through a resistor divider connected to VDD for amplifiers which require second gate voltage.
The HMC981 ensures the protection of the external amplifier during turn on/off by adjusting the sequence of VDRAIN,
VGATE and VG2 outputs. HMC981 controls the bias current of the amplifier under bias with the gate control driver. The
current passing through the amplifier is continuously sampled and is used to control the VGATE voltage connected to
the gate of the amplifier.
The HMC981 employs a SW pad to control RDS_ON resistance of the internal switch between VDD and VDRAIN.
Refer to the section under the “Supply and Drain Voltage” section for details.
The HMC981 has a built-in short circuit protection feature to protect both itself and the amplifier under bias against
short circuit conditions at the VDRAIN output. Refer to the section under the “Short Circuit Protection” section for
details.
Digital Power Supply (VDIG)
The HMC981 requires an external low voltage bias rail (3.3V to 5.0V). VDIG powers the internal logic circuitry. VDIG
draws an average of 3 mA from a 3.3V. VDIG can accept voltages up to 5.0V.
Supply and Drain Voltage (VDD and VDRAIN)
The VDD supply to the HMC981 is directly connected to the VDRAIN output through an internal MOSFET switch.
This internal MOSFET is controlled through power-up sequencing which ensures that no voltage is applied to drain
of the external amplifier until the gate voltage is pulled down to VNEG(ensuring external amplifier is pinched-off). The
VDRAIN output of the HMC981 should be connected to the drain (collector) of the amplifier under bias for the active
bias control feedback and power-up/down sequencing to work.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 11
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
There will be a voltage drop from VDD to VDRAIN due to finite RDS_ON resistance of the internal switch. To
compensate for this voltage drop choose the VDD value as shown in equation (1).
VDD = VDRAIN + IDRAIN x RDS_ON
(1)
where VDRAIN is the supply voltage of the external amplifier and IDRAIN is the desired constant bias current through
the external amplifier.
Note that RDS_ON resistance of the internal FET switch can be adjusted through SW pad. RDS_ON is typically equal
to 5 Ohms when SW is pulled up to VDIG, and is typically equal to 10 Ohms when SW is pulled down to GND. If SW
is left floating, it is pulled up to VDIG through an internal weak pull-up. Recommended settings for the SW position
are given in Table-1. Not using the HMC981 in the recommended settings will increase the power dissipation of the
part and may increase the part-to-part variation.
Table 1. Recommended Current Range Configuration
Current Range (mA)
Condition
SW=GND
SW=VDIG
RDS_ON (Ohm)
13
20 to 80
10
5
80 to 200
Negative Voltage Generator (VNEGOUT)
The HMC981 has an internally regulated charge pump block to generate negative voltage (VNEGOUT) required for
depletion mode devices. The HMC981 generates -2.5V at the VNEGOUT output in default configuration. It requires
two diodes and two capacitors connected externally as shown in the sample application schematics. The HMC981 is
designed to reject the ripple on the VNEGOUT by isolating VNEGOUT from the VGATE. The negative voltage is only
required for depletion mode devices, and it can be disabled through the VGATEFB and VNEGFB pads. Where an
enhancement device is targeted or a negative supply is already available in the system, simply connect the available
negative supply to the VNEG pad. See Table-2 for detail on how to set this operation mode.
Enable/Disable (EN)
The active bias control loop is enabled when EN is pulled up to VDIG, and it is disabled when it is pulled down to GND.
If EN is left floating HMC981 is enabled through an internal weak pull-up. Note that VNEG operation is independent
of EN condition. EN signal controls the operation of only VGATE, VG2 and VDRAIN outputs. When EN pulled down
to GND, the HMC981 discharges VDRAIN and VG2 down to GND and it pulls the VGATE down to VNEG. Please see
the “Active Bias Control Loop” section for detailed explanation.
Active Bias Control Loop
The HMC981 regulates the bias current (IDRAIN) of the amplifier under bias through VGATE output connected to
the gate of the external amplifier. In this closed loop operation the current passing through the amplifier under bias is
sampled and is used to adjust VGATE to achieve constant quiescent bias through the external amplifier.
The HMC981 continuously compensates for any supply, temperature, process variations and threshold drifts due to
aging. The part-to-part, temperature, and supply variation of the HMC981 is excellent. Thus, by using an accurate
sense resistor connected to the ISENSE pad, expensive calibration procedures in high volume production could be
avoided.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 12
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
The gate control of the HMC981 is designed to both sink and source current in to the gate of the targeted amplifier (at
least 0.8 mA). This unique feature is important to achieve nearly constant quiescent bias through the amplifier under
varying gate current at different input power values.
The bias current passing through the external amplifier can be adjusted with RSENSE, where RSENSE is the R10
connected from ISENSE to GND. Use the relation given in equation (2) to set the desired bias current through the
external amplifier.
IDRAIN=32/Rsense (A)
(2)
Self Protection Feature
Due to the small resistance of the internal switch FET a large amount of current may flow through the HMC981.
HMC981 limits the maximum current to protect itself under such fault conditions, by turnung of VDRAIN and VGATE.
13
The HMC981 will remain in this protection mode until a full power-cycle or enable/disable cycle is applied.
VNEG Fault Detection Feature
In depletion mode operation VNEG is continuously monitored against short circuit fault to GND. If VNEG rises above
a preset value (typically -1V) the system and the external amplifier are disabled by pulling VDRAIN and VG2 to GND
and VGATE to VNEG. The system will stay in this stand-by mode until short fault at VNEG is fixed.
Power-up and Enable Sequencing
To ensure the protection of the external amplifier, the HMC981 provides a power-up sequence for enabling active bias
control loop. During start-up VDRAIN and VG2 are kept at GND while VGATE is taken to the most negative supply
available (VGATE=VNEG). This ensures that external amplifier is completely pinched-off before VDRAIN is applied.
When EN signal is received, VDRAIN is applied and the active bias loop is enabled. After the VDRAIN is applied, VG2
is generated. The final phase of the power-up sequence is completed by increasing the VGATE linearly until the set
IDRAIN value is achieved.
For power-down and disabling the same sequencing is applied in the reverse order.
Daisy-Chain Operation
HMC981 produces a trigger out signal (TRIGOUT pad#13) when VDRAIN output is enabled. This trigger signal can
be used to enable additional HMC981 chips in a chain of amplifiers. The triggering sequence can be routed in any
way, from input to output, or from output to input depending on the use. Figure-1 presents a sample use of three
HMC981s in an amplification chain. Please note that, only one of the HMC981 is used to generate the negative
voltage and the remaining HMC981 is set to receive external negative voltage (which is provided from the master
HMC981). Generating negative voltage from a single HMC981 reduces the number of the components in the system,
and decreases the over all current consumption..
Please note that, to ensure proper start-up, the system enable signal should be applied to the chip that has the
negative voltage generator.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 13
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
13
Figure 1. Daisy Chain Operation
Operation Modes
HMC981 can be configured to bias both enhancement and depletion mode external amplifiers. The mode of operation
can be selected by setting two pads (VNEGFB, VGATEFB) as tabulated in Table-2. The connection to the VNEGIN
should be adjusted accordingly.
In order not to bias external amplifier in a wrong region, please make sure that the correct mode of operation is
selected before powering up the HMC981.
The HMC981 does not allow the internal negative voltage generator to work if an enhancement mode is selected.
Therefore, if VNEGFB is left floating while VGATEFB is grounded, HMC981 will stay in standby mode.
Please note that the external negative voltage should be between -2.5V to -3.5V for HMC981 to operate. If your
application requires negative voltages outside this range please contact Hittite application support.
Table 2 - Mode Selection
VNEGFB
VGATEFB
FLOAT
VNEGIN
Description
Depletion mode transistor. Internal negative voltage generator is
active and generates -2.5V. Sample application schematic given
shown in Fig.2a.
MODE1
(Depletion/Master Mode)
Connected to
VNEGOUT
FLOAT
Depletion mode transistor. Internal negative voltage generator is
disabled. An external negative voltage less than -2.3V should be
connected to VNEGIN. Sample application schematic given shown
in Fig.2b.
MODE2
(Depletion/Slave Mode)
Connected to
External VSS
GND
FLOAT
---
FLOAT
GND
GND
GND
N/A
Not allowed. HMC981 stays in standby.
MODE3
(Enhancement Mode)
Connected to
GND
Enhancement mode transistor. Internal negative voltage generator is
disabled. Sample application schematic given shown in Fig.2c.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 14
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
13
Figure 2a. Depletion/Master Mode Amplifier Typical Application Circuit (Mode 1)
Figure 2b. Depletion/Slave Mode Amplifier Typical Application Circuit (Mode 2)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 15
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
13
Figure 2c. Enhancement Mode Amplifier Typical Application Circuit (Mode 3)
Table 3 - List of Bias Settings for Various Hittite Amplifiers
Hittite Part Number
VDRAIN (V)
VDD (V)
IDRAIN (mA)
LNAs
RSENSE (kOhm) R2 (kOhm) R1 (kOhm)
VG2 (V)
HMC-ALH140
HMC-ALH216
4
4
4.60
4.45
60
90
0.53
0.36
open
open
open
open
-
-
HMC-ALH244
4
4.45
45
0.71
open
open
-
HMC-ALH310[1]
HMC-ALH311[1]
HMC-ALH313[1]
HMC-ALH382[1]
HMC-ALH435
HMC-ALH444
HMC-ALH476
HMC490
2.5
2.5
2.5
2.5
5
3.02 [1]
3.04 [1]
3.02 [1]
3.14 [1]
5.30
52
0.62
0.59
0.62
0.50
1.07
0.58
0.36
0.16
0.16
0.36
0.32
0.32
0.19
0.19
0.46
0.58
0.71
open
open
open
open
5.60
open
open
open
open
5
-
54
-
52
-
64
-
30
1.5
5
5.55
55
5.09
5
1.5
4
4.45
90
open
open
open
open
open
open
open
open
open
5.09
open
open
open
open
open
open
open
open
open
5
-
-
5
6.00
200
HMC490LP5
HMC504LC4B
HMC594
5
6.00
200
-
4
4.45
90
-
6
6.50
100
-
HMC594LC3B
HMC609
6
6.50
100
-
6
6.85
170
-
HMC609LC4
HMC752LC4[1]
HMC753LP4E
HMC772LC4
6
6.85
170
-
3
3.70 [1]
70
-
5
5.55
55
1.5
-
4
4.45
45
open
open
Linear & Power
HMC-ABH209
HMC-ABH264
5
5
5.80
5.60
80
0.40
0.27
open
open
open
open
-
-
120
HMC-AUH317
4
4.80
160
0.20
open
open
-
[1]For applications below 4V supply please contact factory.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 16
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Table 3 - List of Bias Settings for Various Hittite Amplifiers (Continued)
Hittite Part Number
HMC-AUH318
HMC-AUH320
HMC442
VDRAIN (V)
VDD (V)
IDRAIN (mA)
RSENSE (kOhm) R2 (kOhm) R1 (kOhm)
VG2 (V)
4
4
5
5
5
5
5
4.80
160
130
85
0.20
0.25
0.38
0.38
0.38
0.16
0.16
open
open
open
open
open
open
open
open
open
open
open
open
open
open
-
-
-
-
-
-
-
4.65
5.43
HMC442LC3B
HMC442LM1
HMC499
5.42
84
5.43
85
6.00
200
200
HMC499LC4
6.00
Wideband (Distributed)
HMC-ALH482
HMC-AUH232
HMC-AUH249
HMC-AUH312
HMC460
4
5
5
8
8
8
5
5
5
8
8
8
5
5
5
5
10
4.45
5.90
6.00
8.60
8.60
8.75
5.60
5.60
5.60
8.80
8.80
8.80
5.90
5.90
5.90
5.90
10.88
45
180
200
60
0.71
open
4.52
4.38
2.82
open
open
open
open
open
2.33
2.33
open
open
open
open
open
3.95
open
5
-
1.5
1.5
1.8
-
0.18
0.16
0.53
0.53
0.43
0.53
0.53
0.53
0.20
0.20
0.40
0.18
0.18
0.18
0.18
0.18
5
5
13
60
open
open
open
open
open
5
HMC460LC5
HMC463
75
-
60
-
HMC463LH250
HMC463LP5
HMC465
60
-
60
-
160
160
80
1.5
1.5
-
HMC465LP5
HMC562
5
open
open
open
open
open
5
HMC633
180
180
180
180
175
-
HMC633LC4
HMC634
-
-
HMC634LC4
HMC-930
-
3.5
Microwave & Optical Drivers
HMC870LC5
HMC871LC5
7
8
7.83
165
75
0.19
0.43
open
open
open
open
-
-
8.38
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 17
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Notes:
13
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13 - 18
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