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Systems and methods of RF power transmission, modulation, and amplification, including output stage protection circuitry

  • US 8,577,313 B2
  • Filed: 11/15/2006
  • Issued: 11/05/2013
  • Est. Priority Date: 10/22/2004
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first module configured to generate a plurality of in-phase (I) and quadrature (Q) control signals;

    a second module configured to generate a plurality of substantially constant envelope signals using said plurality of I and Q control signals and a frequency reference signal;

    a power amplifier configured to amplify and combine said plurality of substantially constant envelope signals to create an output signal; and

    an output stage protection module configured to control an output of said power amplifier to be below a threshold, wherein said output stage protection module comprises circuitry configured to control a bias of an input stage of said power amplifier based on said plurality of I and Q control signals.

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