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Amplifying system

  • US 9,584,085 B2
  • Filed: 11/26/2014
  • Issued: 02/28/2017
  • Est. Priority Date: 11/26/2013
  • Status: Active Grant
First Claim
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1. An amplifying system comprising:

  • a first gain stage with a first gain characteristic;

    a second gain stage with a second gain characteristic; and

    bias circuitry that includes a reference headroom voltage generator and is configured to provide bias responsive to a reference voltage generated by the reference headroom voltage generator such that a voltage difference between a bias point and a threshold voltage of at least one of the first gain stage and the second gain stage is maintained at a constant level to substantially maintain alignment of distortion inflection points between the first gain characteristic and the second gain characteristic to limit total gain variations to less than 0.1 dB per dB of output stage power during operation for an input power to the first gain stage that ranges from −

    50 dB to 0 dB.

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