CGY180 Ver la hoja de datos (PDF) - Siemens AG

Número de pieza

componentes Descripción

Fabricante

CGY180

GaAs MMIC

Siemens AG 

GaAs MMIC

CGY 180

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APPLICATION - HINTS

1. CW - capability of the CGY180

1.1 VD = 3 V

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 the temperature in the datasheet (page 8/14). The

CGY180 has a maximum total power dissipation of Ptot = 2.3 W.

As an example we take the operating point with a drain voltage VD = 3 V. The possible ratings of

the drain current adjusted by the internal current control of the CGY180

( VG = -4 V, VTR = 0 V ) are shown in the following table.

Min.

ID / mA

325

Typ.

Max.

450

650

At worst case you see a current of ID = 650 mA. So the maximum DC - power can be calculated to

PDC = VD ⋅ ID = 1.95W

This value is smaller than 2.3W and CW - operation is possible.

1.2 VD = 4 V

If you want to use the whole capability of the CGY180, you must consider the power added

efficiency PAE. You want to take an operation point of VD = 4 V. Now there will be a higher

current than at VD = 3 V. We assume a current of ID = 650 mA and a PAE = 35 %. With these

values the DC - power is PDC = 2.6 W. That exeeds the PtotDC of 2.3 W. Decoupling RF-Power

from the CGY180 results in less power dissipation of the device. This is directly correlated with the

achieved PAE. To calculate total power dissipation use the formula:

( ) PtotDC = PDC 1− PAE .

Ptot for the used operating point shown above will be

Ptot = 2.6W (1 − 0.35) = 1.69W .

It is possible to use the CGY180 for CW - operations up to a drain voltage of VD = 4 V, if at the

same time a PAE of 35% is achieved.

The calculation can be done for any operating point to prove the capability of CW - operation.

Siemens Aktiengesellschaft

pg. 14/15

21.02.96

HL EH PD 21

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