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CGY196

GaAs MMIC

TriQuint Semiconductor 

GaAs MMIC

CGY 196

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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)

80

25

50

75

100

125

150

175

Temperature of soldering point, Ts

°C

b) Pulsed Operation

For the calculation of the permissible pulse load Ptot-max the following formula is applicable:

• Ptot-max = Ptot-DC x Pulse factor

= Ptot-DC x ( Ptot-max / Ptot-DC )

Use the values for Ptot-DC as derived from the above diagram and for the pulse factor = Ptot-max / Ptot-DC

TriQuint Semiconductor Europe

October 1st, 2002

page 3 3/18

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