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.
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
Typical Applications
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
• Fiber Optic Modulator Driver Biasing
• CATV Laser Driver Biasing
• Cellular Base Station
• Wireless Infrastructure Equipment
