RMDA00400 데이터 시트보기 (PDF) - Fairchild Semiconductor

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RMDA00400

OC-768 Modulator Driver MMIC

Fairchild Semiconductor 

# 425430398

RMDA00400

OC-768 Modulator Driver MMIC

ADVANCED INFORMATION

Recommended

Assembly

Diagram

Recommended

Procedure for

Biasing and

Operation

Caution: This is an ESD Sensitive Device.Loss of Gate Voltage (Vg1) while Drain Voltage (Vd) is

present may damage the amplifier chip.

The following sequence of steps must be followed to properly test the amplifier:

Step 1:

Turn off RF input power.

Step 2:

Step 3:

Connect the DC supply grounds to the ground of the chip carrier.

Apply negative gate bias supply voltage of –1.5 V to Vg1.

Apply +1.5V to Vg2 (Gain control).

Step 4:

Apply positive drain bias supply voltage of +8.0 V to Vd, and monitor drain current Id.

Step 5:

Adjust gate bias voltage Vg1 to set the quiescent current of Idq ~ 180 mA.

Step 6:

After the bias condition is established, the RF input signal may now be

applied at the appropriate frequency band. Adjust Vg1 for best gain flatness.

Note:

When the device is under RF operation, the supply current Id will increase depending

upon output power required.

The gain can be adjusted from 10 dB to –30 dB by changing the voltage on Vg2 from

+1.5V to –1.0V

Step 7:

Follow turn-off sequence of:

(i) Turn off RF input power.

(ii) Turn down and off drain voltage (Vd).

(iii) Turn down and off Gain control voltage (Vg2).

(iv) Turn down and off gate bias voltage (Vg1).

Characteristic performance data and specifications are subject to change

without notice.

Revised August 26, 2002

Page 5

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