HMC980_12 Datasheet, PDF (1/20 Pages) Hittite Microwave Corporation – Active Bias Controller

v00.0312
Typical Applications
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
• Fiber Optic Modulator Driver Biasing
• CATV Laser Driver Biasing
• Cellular Base Station
• Wireless Infrastructure Equipment
HMC980
Active Bias Controller
High Current
Features
• Automatic Gate voltage adjustment (No Calibra-
tion required)
• Supply Voltage (5V to 16.5V)
• Bias both Enhancement or Depletion type
devices
• Adjustable Drain Current up to 1.6 A
• Sink or source gate current
• Internal negative voltage generation
• Can be disabled to use external negative rail
• Fast Enable/Disable
• Trigger-out Output for Daisy Chain
• Power-Up and Power-Down Sequencing
• Over/Under Current Alarm with built-in hystresis
• Die Size: 1.4 x 2.26 x 0.25mm
Functional Diagram
General Description
HMC980 is an active bias controller that can
automatically adjust the gate voltage of an external
amplifier to achieve constant bias current. With an
integrated controller, HMC980 achieves safe power on/
off, disable/enable and automatic supply sequencing
ensuring the safety of the external amplifier. It can
be used to bias any enhancement and depletion
type amplifier operating in Class-A regime with
drain voltages (VDRAIN) from 5V to 16.5V and drain
currents (IDRAIN) up to 1.6 A, offering a complete
biasing solution.
HMC980 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: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
1
Phone: [phone] Fax: [phone] Order On-line at www.hittite.com
Application Support: Phone: [phone] or [e-mail]