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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HMC980

v00.0312

Active BiAs controller

High current

General Description

Functional Diagram

Features

typical Applications

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.

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Microwave radio & Vsat

•

Military & space

•

test instrumentation

•

Fiber optic Modulator Driver Biasing

•

CatV laser Driver Biasing

•

Cellular Base station

•

Wireless infrastructure equipment

•

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

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sink or source gate current

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internal negative voltage generation

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Can be disabled to use external negative rail

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Fast enable/Disable

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trigger-out output for Daisy Chain

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power-Up and power-Down sequencing

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over/Under Current alarm with built-in hystresis

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Die size: 1.4 x 2.26 x 0.25mm