POWER AMPLIFICATION DEVICE, AND INPUT BIAS VOLTAGE ADJUSTMENT METHOD FOR POWER AMPLIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a power amplification device and an input bias voltage adjustment method for a power amplification device which implement significantly improved time efficiency of adjustment of an input bias voltage.

SOLUTION: A bias voltage supply section feeds a bias voltage to a gate of a GaN-FET. An arithmetic control section calculates a difference in load current between different time points. A reference table describes a correspondence defined for the GaN-FET between an initial drain current change rate of a drain current changing from the start of a constantly maintained gate-source voltage and a change in gate-source voltage required to maintain the drain current at the start of the constantly maintained gate-source voltage after the lapse of a time. A reference control section applies the difference in load current to the drain current change rate in the reference table to retrieve the change in gate-source voltage. A bias voltage change control section controls the bias voltage supply section to change the gate bias voltage according to the change.

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