mga-333840-02b MicroWave Technology, Inc., mga-333840-02b Datasheet - Page 6

• Manufacturer Part Number: mga-333840-02b
• Description: 3.3 ? 3.8 Ghz 10w High Efficiency Linear Power Amplifier
• Manufacturer: MicroWave Technology, Inc.

MGA-333840-02
3.3 – 3.8 GHz 10W High Efficiency
Linear Power Amplifier
Preliminary Data Sheet
December 2008
Application Circuit
The evaluation board material, shown in Figure A, is Rogers 4003 material, 20 mil thick. The RF trace weight is 2 oz.
Through holes with a diameter of 20 mils are spread uniformly over the center paddle for thermal relief and ground.
Via holes underneath the paddle are back filled with conductive epoxy. It is recommended that via holes be placed
nearby the DC bias connector to maintain ground continuity between the top layer and bottom ground planes.
Mounting holes near the unit will help secure the board to the chassis, minimize ground current loops and improve
thermal conductivity in the absence of sweat soldering the board to the chassis.
Figure A Evaluation Board
Biasing with quarter-wave stubs at the gate and drain are shown in Figure A. The impedance of the quarter wave
structures is cyclical with frequency. A RF short is observed at frequencies that are even multiples of a quarter-
wavelength and an open-impedance is observed at frequencies that are odd multiples of a quarter-wavelength. A 56
Ohm resistor is added in series to the gate bias. The effective impedance is increased which reduces the risk of
oscillations. The 56 ohm resistor is not shown in Figure A. Through holes underneath the package is required to
connect the top and bottom grounds and to improve thermal conductivity.
MicroWave Technology, Inc., an IXYS Company, 4268 Solar Way, Fremont, CA 94538
510-651-6700
510-651-2208
www.mwtinc.com
FAX
WEB
Data contained herein is subject to change without notice. All rights reserved © 2008
Please visit MwT website
www.mwtinc.com
for information on other MwT MMIC products.
Page 6 of 10, December 2008