RMBA19500 Ver la hoja de datos (PDF) - Fairchild Semiconductor

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RMBA19500

PCS 2 Watt Linear GaAs MMIC Power Amplifier

Fairchild Semiconductor 

Figure 4. Layout of Test Evaluation Board (RMBA19500-TD, G655971)

Test Procedure for the Evaluation Board (RMBA19500-TB)

CAUTION: LOSS OF GATE VOLTAGES (Vg1, Vg2,

Vg3) WHILE CORRESPONDING DRAIN VOLTAGES

(Vdd) ARE PRESENT CAN DAMAGE THE AMPLIFIER.

The following sequence must be followed to properly test

the amplifier. (It is necessary to add a fan to provide air

cooling across the heat sink of RMBA19500.)

Step 1: Turn off RF input power.

Step 2: Use GND terminal of the evaluation board for the

ground of the DC supplies. Set Vgg1, Vgg2 and Vgg3 to

-3V (pinch-off).

Step 3: Slowly apply drain supply voltages of +7V to the

board terminal Vdd ensuring that there is no short.

Step 4: Adjust Vgg12 up from -3V until the drain current

(with no RF applied) increases to Idq12 as per supplied

result sheet. Then adjust Vgg3 until the total drain current

becomes equal to the sum of Idq12 and Idq3.

Step 5: After the bias condition is established, RF input

signal may now be applied at the appropriate frequency

band and appropriate power level.

Step 6: Follow turn-off sequence of:

(i) Turn off RF Input Power

(ii) Turn down and off drain voltage Vdd.

(iii) Turn down and off gate voltages Vgg1, Vgg 2 and

Vgg3.

©2003 Fairchild Semiconductor Corporation

RMBA19500 Rev. C

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