CGY94 Просмотр технического описания (PDF) - Siemens AG

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CGY94

GaAs MMIC

Siemens AG 

GaAs MMIC

CGY 94

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APPLICATION - HINTS

1. CW - capability of the CGY94

Proving the possibility of CW - operation there must be known the total power dissipation of the

device. This value can be found as a function of the temperature in the datasheet (page 7). The

CGY94 has a maximum total power dissipation of Ptot = 5 W.

As an example we take the operating point with a drain voltage VD = 3 V and a typical drain current

of ID=1.0 A. So the maximum DC - power can be calculated to:

P =V ⋅ I = 3W

DC D D

This value is smaller than 5 W and CW - operation is possible.

By decoupling RF power out of the CGY94 the power dissipation of the device can be further

reduced. Assuming a power added efficiency (PAE) of 40 % the total power dissipation Ptot can be

calculated using the following formula:

P = P (1− PAE ) = 3W(1− 0.40) = 1.8W

tot DC

2. Operation without using the internal current control

If you don' t want to use the internal current control, it is recommended to connect the negative

supply voltage at pin 1 (VTR) instead of pin 2 (VG). In that case VG is not connected.

3. Biasing and use considerations

Biasing should be timed in such a way, that the gate voltage (VG) is always applied before the drain

voltage (VD), and when returning to the standby mode, the drain voltage has to be removed before

the gate voltage.

Siemens Aktiengesellschaft

pg. 9/9

17.10.95

HL EH PD 21

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