GaAs MMIC

CGY 181

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Siemens Aktiengesellschaft

pg. 2/14

01.02.96

HL EH PD 21

Functional block diagramm:

Short description of CGY181

operation:

A negative voltage between -4V to -6V

(stabilization not necessary) has to be

connected to the VG-pin, a positive

supply voltage has to be applied to the

VD-pins.

The VTR-pin has to switched to 0V

(GND) during transmit operation. The

MMIC CGY181 is self-biased, the

operating current is adjusted by the

internal control circuit.

In receive mode the VTR-pin is not

connected (shut off mode).

Pin #

Configuration

1

VG

Negative voltage at control circuit (-4V...-8V)

2

VTR

Control voltage for transmit mode (0V) or receive mode (open)

3,4,5,10

GND 2

RF and DC ground of the 2nd stage

6,9

GND 1

RF and DC ground of the 1st stage

7

VD1

Positive drain voltage of the 1st stage

8

RFin

RF input power

11

VD2,RFout

Positive drain voltage of the 2nd stage, RF output power

12

-

not connected

DC characteristics

Characteristics

Symbol Conditions

min

typ

max

Unit

Drain current

stage 1

IDSS1

VD=3V, VG=0V, VTR n.c.

0.6

0.9

1.2

A

stage 2

IDSS2

2.4

3.5

4.8

A

Drain current with

active current control

ID

VD=3V, VG=-4V, VTR=0V

1.0

A

Transconductance

gfs1

VD=3V, ID=350mA

0.28

0.32

-

S

(stage 1 and 2)

gfs2

VD=3V, ID=700mA

1.1

1.3

-

S

Pinch off voltage

Vp

VD=3V, ID<500

µA

(all stages)

-3.8

-2.8

-1.8

V

Pin (8)

Pout (11)

GND1 (6,9)

GND2

VD1 (7)

VD2 (11)

VG (1)

Control

Circuit

VTR (2)

(3, 4, 5, 10)