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Current modulator with dynamic amplifier impedance compensation

  • US 6,566,944 B1
  • Filed: 02/21/2002
  • Issued: 05/20/2003
  • Est. Priority Date: 02/21/2002
  • Status: Expired due to Term
First Claim
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1. A current modulator to supply a modulated supply current to a power amplifier responsive to an amplitude modulation signal, the current modulator comprising:

  • a modulation control circuit generating a modulation control signal responsive to the amplitude modulation signal;

    an output circuit generating the modulated supply current responsive to the modulation control signal;

    a reference circuit generating a reference current proportional to the modulated supply current, and including a reference control element responsive to an inferential sense signal to maintain the reference current at a known proportionality relative to the modulated supply current; and

    a detection circuit generating the inferential sense signal as a function of an operating voltage of the power amplifier and the reference current such that the inferential sense signal varies in dependence on power amplifier (PA) AM modulation impedance.

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