CGY181 データシートの表示（PDF） - Siemens AG

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CGY181

GaAs MMIC

Siemens AG 

GaAs MMIC

CGY 181

________________________________________________________________________________________________________

APPLICATION - HINTS

1. CW - capability of the CGY181

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

device. This value can be found as a function of temperature in the datasheet (page 12). The

CGY181 has a maximum total power dissipation of Ptot = 5 W.

As an example we take the operating point with a drain voltage VD = 3.6 V and a typical drain

current of ID=1.2A. So the maximum DC - power can be calculated to:

P

DC

=

V

D

⋅ ID

=

4.32W .

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

By decoupling RF power out of the CGY181 the power dissipation of the device can be further

reduced. Assuming a power added efficiency PAE of 35 % the total power dissipation Ptot can be

calculated using the following formula:

P = P (1− PAE ) = 4.32W(1 − 0.35) = 2.808W

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

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

3. Biasing and use considerations

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

voltages (VD), and when returning to the standby mode, the drain voltages have be removed before

the gate voltage.

Siemens Aktiengesellschaft

pg. 14/14

01.02.96

HL EH PD 21

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