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EER modulator with power amplifier having feedback loop providing soft output impedance

  • US 7,068,096 B2
  • Filed: 12/08/2003
  • Issued: 06/27/2006
  • Est. Priority Date: 12/08/2003
  • Status: Active Grant
First Claim
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1. An EER amplifier for amplifying a signal, comprising:

  • (I) a divider for dividing said signal into a phase signal and an envelope signal;

    (II) a first RF amplifier for amplifying said signal, said first amplifier having a bias supply input;

    (III) an EER modulator having input receiving said envelope signal and an output coupled to said bias supply input of said first RE amplifier, said EER modulator comprising;

    (A) a high frequency power operational amplifier for amplifying a high frequency portion of said envelope signal, and having an output coupled to said output of said EER modulator;

    (B) a high efficiency power amplifier for amplifying a remaining portion of said envelope signal, said power amplifier having;

    (1) a current control input,(2) a current monitoring output,(3) a power output coupled to said output of said EER modulator;

    (C) a feedback control loop comprising;

    (1) a current-to-voltage conversion amplifier having;

    (a) an input coupled to said current monitoring output of said high efficiency power amplifier and (b) an output,(2) an input buffer amplifier having;

    (a) an input coupled to receive said envelope signal and (b) an output;

    (3) a summing amplifier having;

    (a) an input coupled to the outputs of;

    (a) said current-to-voltage conversion amplifier and (b) said input buffer amplifier, and(b) an output coupled to said current control input of said high efficiency power amplifier.

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