ZABG4002

ZABG4002

Document number: DS32047 Rev. 1 - 2

1 of 7

www.diodes.com

January 2010

© Diodes Incorporated

A Product Line of

Diodes Incorporated

LOW POWER 4 STAGE FET LNA BIAS CONTROLLER

Summary

The ZABG4002 is a four stage depletion mode FET bias controller intended primarily for satellite Low Noise Block’s (LNB’s), but

its also suitable for other LNA applications such as those in found in PMR’s and microwave links. The ZABG4002 provides each

FET with an independent protected negative gate voltage and positive drain voltage with user programmable drain current.

Combining an advanced IC process and packaging techniques, the ZABG4002 helps minimise power consumption, component

cost and PCB area whilst enhancing overall reliability.

Features

• Four stage FET bias controller

• Operating range of 3.0V to 8.0V

• Low quiescent supply current, 1.2mA typical

• FET drain voltages set at 2.0V

• FET drain current selectable from 0 to 15mA

• Switchable FETs for power management

• Allows first and second stage FETs to be run at different

(optimum) drain currents

• FET drain voltages and currents held stable over

temperature and Vcc variations

• FETs protected against overstress during power-up and

power-down.

•

Internal negative supply generator allowing single supply

operation (available for external use)

• Low external component count

Pin Assignments

Applications

•

Twin LNB’s

•

Quad LNB’s

•

US LNB’s

•

Microwave links

•

PMR and Cellular telephone systems

Single Universal LNB System Diagram

ZXHF

5002

ZABG

6002

ZXHF

5002

ZABG

4002

Gain stages

GaAs FET’s

Down

Converter

IF Switching, gain

and control

ZXHF

5002

ZABG

6002

ZXHF

5002

ZABG

4002

Gain stages

GaAs FET’s

Down

Converter

IF Switching, gain

and control

Top View

Bottom View

C

SUB

G2

V

CC

GND

G3

D2

G4

R

CAL1

D4