RMBA09501 Ver la hoja de datos (PDF) - Fairchild Semiconductor

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RMBA09501

Cellular 2 Watt Linear GaAs MMIC Power Amplifier

Fairchild Semiconductor 

Figure 4. Layout of Test Evaluation Board (RMBA09501-TD, G657471)

Test Procedure for the Evaluation Board (RMBA09501-TB)

CAUTION: LOSS OF GATE VOLTAGES (VG1, VG2)

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 RMBA09501.) Note:

Vdd1, 2 are tied together.

Step 1: Turn off RF input power.

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

ground of the DC supplies. Slowly apply gate supply

voltages as specified on results sheet supplied with test

board to the board terminals Vgg1 and Vgg2.

Step 3: Slowly apply drain supply voltages of +7.0V to the

board terminals Vdd1, 2. Adjust Vgg to set the total

quiescent current Idq1 and Idq2 (with no RF applied) Idq

as per supplied result sheet. Gate supply voltages (Vgg

i.e., Vgg1, Vgg2) may be adjusted, only if quiescent

current (Idq1 and Idq2) values desired are different from

those noted on the data summary supplied with product

samples.

Step 4: After the bias condition is established, RF input

signal may now be applied at the appropriate frequency

band and appropriate power level.

Step 5: Follow turn-off sequence of:

(i) Turn off RF Input Power

(ii) Turn down and off drain voltages Vdd1, 2.

(iii) Turn down and off gate voltages Vgg1 and Vgg2.

©2004 Fairchild Semiconductor Corporation

RMBA09501 Rev. C

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