XP1035-QH_16 Datasheet, PDF (6/8 Pages) M/A-COM Technology Solutions, Inc. – Power Amplifier

XP1035-QH
Power Amplifier
5.9 - 9.5 GHz
Rev. V1
App Note [1] Biasing - As shown in the Pin Designations table, the device is operated by biasing VD1,2,3
at 5.0V with 70, 140, 280mA respectively. It is recommended to use active bias to keep the currents
constant in order to maintain the best performance over temperature. Depending on the supply voltage
available and the power dissipation constraints, the bias circuit may be a single transistor or a low power
operational amplifier, with a low value resistor in series with the drain supply used to sense the current. The
gate of the pHEMT is controlled to maintain correct drain current and thus drain voltage. The typical gate
voltage needed to do this is -1.0V. Make sure to sequence the applied voltage to ensure negative gate bias
is available before applying the positive drain supply.
App Note [2] Board Layout - As shown in the board layout, it is recommended to provide 100pF
decoupling caps as close to the bias pins as possible, with additional 10μF decoupling caps.
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