RMBA19500A-58 데이터 시트보기 (PDF) - Raytheon Company

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RMBA19500A-58

PCS1900 2 Watt GaAs MMIC Power Amplifier

Raytheon Company 

RMBA19500A-58

PCS1900 2 Watt GaAs MMIC

Power Amplifier

Figure 4

Layout of Test

Evaluation Board

(RMBA19500A-58-TB)

HS (Heat-sink is attached

under base of RMBA19500A-58)

ADVANCED INFORMATION

J1

RF Input

J2

RF Output

GND Vg1,2 GND Vg3 GND Vdd GND

Test Procedure

for the evaluation board

(RMBA19500A-58-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 RMBA19500A.)

Step 1:

Step 2:

Step 3:

Step 4:

Turn off RF input power.

Use GND terminal of the evaluation board for

the ground of the DC supplies. Set Vgg1, 2

and Vgg3 to -4V (pinch-off).

Slowly apply drain supply voltages of +5 V to

the board terminal Vdd ensuring that there is

no short.

Adjust Vgg3 up from -3V until the drain

current (with no RF applied) increases to Idq3

as per supplied result sheet. Then adjust

Vgg1, 2 until the total drain current becomes

equal to the sum of Idq1, 2 and Idq3.

Step 5:

Step 6:

After the bias condition is established, RF

input signal may now be applied at the

appropriate frequency band and appropriate

power level.

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, 2

and Vgg3.

www.raytheonrf.com

Characteristic performance data and specifications are subject to change without notice.

Revised November 14, 2001

Page 4

Raytheon RF Components

362 Lowell Street

Andover, MA 01810

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