CGY196 データシートの表示（PDF） - Siemens AG

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CGY196

GaAs MMIC

Siemens AG 

CGY 196

Determination of Permissible Total Power Dissipation for Continuous and Pulse

Operation

The dissipated power is the power which remains in the chip and heats the device. It does

not contain RF signals which are coupled out consistently.

a) Continuous Wave / DC Operation

For the determination of the permissible total power dissipation Ptot-DC from the diagram

below it is necessary to obtain the temperature of the soldering point TS first. There are two

cases:

• When RthSA (soldering point to ambient) is not known: Measure TS with a temperature

sensor at the leads were the heat is transferred from the device to the board ( normally at

the widest source or ground lead for GaAs ). Use a small sensor of low heat transport,

for example a thermoelement ( < 1mm ) with thin wires or a temperature indicating paper

while the device is operating.

• When RthSA is already known:

TS = Pdiss x RthSA + TA

mW

1600

1400

1200

1000

800

600

400

200

0

0

Permissible Total Power Dissipation in DC Operation

Ptot DC = f (Ts)

75

25

50

75

100

Temperature of soldering point, Ts

125

150

°C

Siemens Aktiengesellschaft

3

Semiconductor Group

3

16.6.1998

HL HF19P9E8-G11a-A0s1

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