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Linear power amplifier feedback improvement

  • US 4,591,800 A
  • Filed: 10/01/1984
  • Issued: 05/27/1986
  • Est. Priority Date: 10/01/1984
  • Status: Expired due to Term
First Claim
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1. A linear power amplifier feedback system for amplifying amplitude modulated radio frequency (RF) signals, said feedback system comprising:

  • power amplifier means for amplifying RF signals;

    said power amplifier means having its input coupled to a system input port for receiving the RF signal to be amplified and having its output coupled to a system output port at which the amplified RF signal is to be provided;

    power amplifier control means coupled to said power amplifier means for controlling the amplitude of the output RF signal of said power amplifier means in response to an envelope error signal;

    attenuator means coupled to said system output port for producing an attenuated output RF signal;

    RF combining means for linearly combining the input RF signal at said system input port and said attenuated output RF signal thereby producing an RF difference signal;

    envelope detection means for detecting the amplitude of said RF difference signal thereby producing said envelope error signal coupled to said power amplifier control means;

    error signal correction means for correcting the DC level of said envelope error signal in response to variations in DC level output of said envelope detection means thereby maintaining DC balance of said linear power amplifier feedback system.

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