RMDA29000 Просмотр технического описания (PDF) - Raytheon Company

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RMDA29000

27-31 GHz Driver Amplifier MMIC

Raytheon Company 

RMDA29000

27-31 GHz Driver Amplifier MMIC

Recommended

Procedure

for Biasing and

Operation

ADVANCED INFORMATION

CAUTION: LOSS OF GATE VOLTAGE (VG) 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: Connect the DC supply grounds to the ground

of the chip carrier.

Slowly apply negative gate bias supply voltage

of -1.5 V to Vg.

Step 3: Slowly apply positive drain bias supply voltage

of +5 V to Vd.

Step 4: Adjust gate bias voltage to set the quiescent

current of Idq=250 mA.

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

input signal may now be

applied at the appropriate frequency band.

Step 6: Follow turn-off sequence of:

(i) Turn off RF input power.

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

(iii) Turn down and off gate bias voltage (Vg).

Note:

An example auto bias sequencing circuit to apply negative gate voltage and positive drain voltage for the above

procedure is shown below.

www.raytheon.com/micro

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

Revised April 16, 2001

Page 4

Raytheon RF Components

362 Lowell Street

Andover, MA 01810

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