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Apparatus and methods for monitoring and controlling power amplifier linearity using detected fundamental and harmonic components

  • US 6,960,956 B2
  • Filed: 01/12/2001
  • Issued: 11/01/2005
  • Est. Priority Date: 01/12/2001
  • Status: Expired due to Term
First Claim
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1. An apparatus for monitoring a power amplifier coupled to a transmission medium, the apparatus comprising:

  • a detector circuit, coupled to the transmission medium, that generates first and second detector signals corresponding to fundamental and harmonic components, respectively, of a power amplifier output signal produced by the power amplifier, wherein the detector circuit comprises;

    a directional coupler that couples the power amplifier to the antenna and that generates an output signal responsive to the power amplifier output signal;

    a first power detector, coupled to the directional coupler, that generates the first detector signal from the output signal generated by the directional coupler;

    a capacitor shunt circuit, coupled to the transmission medium;

    a filter, capacitively coupled to the transmission medium by the capacitor shunt circuit, that filters the power amplifier output signal to produce a filtered output signal;

    a second power detector, coupled to the filter, that generates the second detector signal from the filtered output signal; and

    a comparing circuit, coupled to the detector circuit, that compares the first and second detector signals.

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