L8602

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD

6 of 8

www.unisonic.com.tw

QW-R123-023.a

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LN B SY ST EM DI AGRAM

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T Y PI CAL APPLI CAT I ON CI RCU I T

The UTC L8602 series of devices are designed to meet the bias requirements of GaAs and HEMT FETs

commonly used in satellite receiver LNBs with a minimum of external components whilst operating from a minimal

voltage supply and using minimal current.

The truth table below shows the function of UTC L8602’s features.

L8602 truth table

Resistor Termination

1st LNA

Stages

FET Stage

2nd LNA Stages

3rd LNA/

Mixer Stages

FEATURE

Bias 1

Bias 4

Bias 2

Bias 5

Bias 3

Bias 6

GND

GND

OPEN

on

on

on

on

on

on

3V

GND

OPEN

off

off

on

on

on

on

6 LNA stages to provide

standard bias to the GaAs or

HEMT FET’s

GND

3V

OPEN

on

on

off

off

off

off

Power down FET groups for LNA

switching or power saving.

3V

3V

OPEN

off

off

off

off

off

off

GND

GND

GND

on

on

on

on

mixer

mixer

GND

3V

GND

on

on

off

off

mixer

mixer

3V

GND

GND

off

off

on

on

mixer

mixer

4 LNA stages to provide

standard bias to the GaAs or

HEMT FET’s plus 2 active mixer

stages

3V

3V

GND

off

off

off

off

mixer

mixer