CGY180 データシートの表示（PDF） - Infineon Technologies

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CGY180

GaAs MMIC

Infineon Technologies 

CGY 180

Application Hints

1. CW - Capability of the CGY 180

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

data sheet (see Page 9). The CGY 180 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 CGY 180

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

min.

typ.

max.

ID/mA

325

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 = 1.95 W

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

1.2 × VD = 4 V

If you want to use the whole capability of the CGY 180, 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 exceeds the PtotDC of 2.3 W.

Decoupling RF-Power from the CGY 180 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 = 2.6 W × (1 – 0.35) = 1.69 W

It is possible to use the CGY 180 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.

Data Book

15

03.00

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