Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2007-10-30
2009-10-13
Mottola, Steven J (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
Reexamination Certificate
active
07602243
ABSTRACT:
An object of the present invention is, in a high-frequency amplifier using a semiconductor device as an amplifying device, to achieve a high efficiency by controlling input/output matching circuits so that they are always optimized, when a bias voltage applied to the semiconductor device is controlled to correspond to an envelope of a signal. The bias voltage that is applied to the semiconductor device for amplification is changed to corresponding to the envelope of the signal using a bias control circuit, control voltages for controlling impedance of input/output matching circuits are created from the bias voltage, and the bias voltage and the control voltages that are used to control the impedance of the input/output matching circuits of semiconductor device7are supplied in synchronization with each other. Accordingly, the impedance of the input/output matching circuits is variably controlled so that the circuits always optimized manner, and thereby high efficiency amplification can be accomplished.
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