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CGY98E6784

GaAs MMIC

Infineon Technologies 

GaAs MMIC

CGY 98

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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

Permissible Total Power Dissipation in DC Operation

mW

2400

2200

Ptot DC = f (Ts)

2000

1800

70

1600

1400

1200

1000

800

600

400

200

0

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

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

from the following diagram to get a specific value.

Infenion Technologies AG

GS PD GaAs

13/17

12.05.99

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