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HMC981

Active Bias Controller

Product Details

Data Sheet
ECCN: EAR99

Quality & Reliability

Press & Media

Product Press Release
Supply Range (V) Function VDRAIN Range (V) IDRAIN Bias Current (mA) IGATE Drive Current (mA) VGATE Range (V) Over/Under IDRAIN Current Alarm Package
4 to 12 Active Bias Controller 4 to 12 20 to 200 -0.8 to +0.8 -2.5 to +2.0 - Chip

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 200 mA
• Sink/Source Gate Current Capability

Typical Applications

• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
• Fiber Optic Modulator
   Driver Biasing
• CATV Laser Driver Biasing

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.