Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2011-06-21
2011-06-21
Nguyen, Patricia (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S297000, C330S010000
Reexamination Certificate
active
07965140
ABSTRACT:
A power amplifier is provided with an AD converter pulse modulating an envelope signal extracted from a high frequency modulation signal; a switching amplifier amplifying an output signal from the AD converter; a low-pass filter removing high frequency noise from an output signal from the switching amplifier; a voltage control device controlling a power supply voltage of the switching amplifier; and a high frequency amplifier amplifying a phase-modulated signal having a constant envelope and having output from the low-pass filter as a power supply. The average power of the envelope signal to be inputted to the AD converter is permitted to be constant so that an input dynamic range of the AD converter can be most efficiently used. In addition the average power of the output signal from the power amplifier is adjusted by a power supply voltage to be supplied to the switching amplifier.
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NEC Corporation
Nguyen Patricia
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