Closed loop power control of non-constant envelope waveforms...

Telecommunications – Transmitter – With feedback of modulated output signal

Reexamination Certificate

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Details

C455S127100, C455S108000, C455S116000

Reexamination Certificate

active

07353006

ABSTRACT:
A radio frequency output power control system for use in communication systems is disclosed. The power control system is used for a modulation scheme having a non-constant amplitude envelope and comprises a power amplifier having a power amplifier input for receiving an input signal with a non-constant amplitude envelope, a power control input for receiving a power control input, and a power amplifier output for providing an amplified output signal. The power control system also includes a track and hold circuit for tracking a measured reference power signal that is representative of a modulation of the input signal, and subtraction means for subtracting an output of the track and hold circuit from the measured reference power signal to provide a difference signal that is coupled to the power control input.

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