HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Typical Applications
Features
Automatic Gate voltage adjustment (No Calibration
required)
Supply Voltage: 4V to 12V
Digital Voltage: 3.3V to 5V
Controls both Enhancement and Depletion type
devices
Adjustable Drain Current up to 200mA
Sink/Source Gate Current Capability
Optional Internal negative voltage generation that
can be disabled to use external negative rail
Fast Enable/Disable
Trigger-out Output for Daisy Chain Power-Up and
Power-Down Sequencing
BIAS CONTROLLERS - CHIP
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
• Fiber Optic Modulator Driver Biasing
• CATV Laser Driver Biasing
• Cellular Base Station
• Wireless Infrastructure Equipment
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.
1
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Electrical Specifications,
T
A
= +25°C, VDD=8V, VDIG= 3.3V, Depletion Master
Unless Otherwise Noted
Parameter
Supply Voltage
Symbol
Vdd
VDD = 4V
VDD Quiescent Current
IDD
VDD = 8V
VDIG Quiescent Current
Negative Voltage Output
Oscillator Frequency
Voltage Reference
Enable Input Threshold
Switch Input Threshold
Short Circuit Disable Input Threshold
VDRAIN Characteristics
DRAIN Current Adjustment Range
DRAIN Current Change Over Digital Voltage
DRAIN Current Change Over Temperature
DRAIN Range
VDRAIN Change Over Temperature
VNEG Characteristics
Negative Voltage Output
VNEG Current Sink
VGATE Characteristics
GATE Current Supply
VGATE Low Level
VGATE High Level
VG2 Characteristics
VG2 Current Supply
VG2 Adjustment Range
VDIG Characteristics
Adjustment Range
VDIG Quiescent Current
SW Characteristics
Internal Switch Resistance
RDS_ON
SW= GND
SW=VDIG
10
5
Ohm
Ohm
VDIG
IDIG
VDD= 8 V,
VDIG=EN =3.3 V
3.3
3
5
V
mA
IG2
VG2
VG2<1.5V
VG2>1.5V
-0.1
-1
1
0.1
1
VDD-1.3
mA
mA
V
IG
VG_MIN
VG_MAX
-0.8
VNEG
VNEG+4.5
0.8
mA
V
V
VNEG
INEG
VDD= 4V
VDD= 8V
0
0
-2.5
8
15
V
mA
mA
IDRAIN
SW=GND
SW=VDIG
VDRAIN set to 8V,
IDRAIN set to 160 mA
4
VDRAIN set to 8V,
IDRAIN set to 160 mA
1.5
20
80
0.4
0.02
12
80
200
mA
mA
%/V
%/C
V
%/C
IDIG
VNEG
FOSC
VREF
ENTHRS
SWTHRS
DSCTHRS
Vinlow
Vinhigh
Vinlow
Vinhigh
Vinlow
Vinhigh
1.4
1.4
1
1.4
1
EN = VDIG
EN = GND
EN = VDIG
EN = GND
Conditions
Min.
4
7
3
7.5
4
3
5
-2.5
300
1.42
1
Typ.
Max.
12
Units
V
mA
mA
mA
mA
mA
mA
V
kHz
V
V
V
V
V
V
V
VDIG= 3.3 V
VDIG= 5 V
ΔIDRAINV
VDRAIN
ΔVDRAIN
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
BIAS CONTROLLERS - CHIP
2
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Load Regulation @ VDD=6V, VDIG=3.3V,
SW=GND
6.5
Load Regulation @ VDD=8V,
SW=VDIG=3.3V
8.5
BIAS CONTROLLERS - CHIP
6
8
+25C
+85C
-55C
VDRAIN (V)
+25C
+85C
-55C
VDRAIN (V)
5.5
7.5
5
7
4.5
20
30
40
50
IDRAIN (mA)
60
70
80
6.5
80
100
120
140
IDRAIN (mA)
160
180
200
IDRAIN vs. VDIG
[1][2]
55
VNEG Line Regulation vs. Supply Voltage
-2.45
No load condition
+25C
+85C
-55C
54
-2.47
IDRAIN (mA)
VNEG (V)
+25C
+85C
-55C
53
-2.49
52
-2.51
51
-2.53
50
3.3
3.7
4.1
VDIG (V)
4.5
4.9
-2.55
4
6
8
SUPPLY VOLTAGE (V)
10
12
VNEG Load Regulation @ VDD=4V
-2.3
VNEG Load Regulation @ VDD=12V
-2.3
-2.4
-2.4
VNEG (V)
VNEG (V)
-2.5
-2.5
-2.6
+25C
+85C
-55C
-2.6
+25C
+85C
-55C
-2.7
0
2
4
6
INEG (mA)
8
10
-2.7
0
4
8
INEG (mA)
12
16
[1] IDRAIN is set to 53 mA
[2] HMC465LP5 is used as external amplifier
3
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
Enable Waveform
8
6
4
Disable Waveform
8
4
2
0
-2
-4
-6
-8
0
2
4
6
TIME (ms)
8
10
12
EN
VDRAIN
VG2
VNEG
VGATE
2
0
-2
-4
-6
-8
12
EN
VDRAIN
VG2
VNEG
VGATE
14
16
TIME (ms)
18
20
Power Up Waveform
8
6
VDD
VDRAIN
VDIG
VG2
VNEG
VGATE
Shutdown Waveform
8
6
VDD
VDRAIN
VDIG
VG2
VNEG
VGATE
VOLTAGE (V)
VOLTAGE (V)
4
2
0
-2
-4
0
10
4
2
0
-2
-4
20
30
TIME (ms)
40
50
0
20
40
60
TIME (ms)
80
100
VNEG Load Transient VDD=4V
-0.8
20
VNEG Load Transient VDD=6V
-2.4
-2.425
15
10
5
-1.3
10
-2.45
VNEG (V)
VNEG (V)
-1.8
0
-2.475
-2.5
-2.525
0
-5
-2.3
-10
-10
-15
0
0.5
1
TIME (ms)
1.5
2
-2.8
0
0.5
1
TIME (ms)
1.5
2
-20
-2.55
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
BIAS CONTROLLERS - CHIP
4
6
VOLTAGE (V)
VOLTAGE (V)
INEG (mA)
INEG (mA)
HMC981
v00.0611
ACTIVE BIAS CONTROLLER
VGATE Load Regulation @ VDD=6V
1
VG2 Load Regulation @ VDD=6V
5
4.5
4
3.5
BIAS CONTROLLERS - CHIP
0.5
0
VGATE (V)
VG2 (V)
+25C
+85C
-55C
-0.5
-1
-1.5
-2
-2.5
-3
-1.25
-1
-0.75 -0.5 -0.25
0
0.25
0.5
0.75
3
2.5
2
1.5
1
0.5
VG2=0.9V
VG2=1.78V
VG2=2.74V
VG2=3.71V
1
1.25
0
-2
-1.5
-1
-0.5
0
IG2 (mA)
0.5
1
1.5
2
IG (mA)
5
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
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