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Noise conversion gain limited RF power amplifier

  • US 9,203,353 B2
  • Filed: 03/14/2014
  • Issued: 12/01/2015
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. Circuitry comprising:

  • envelope control circuitry configured to provide an envelope power supply control signal; and

    a radio frequency (RF) modulator configured to provide an RF input signal, wherein;

    an RF power amplifier (PA) is configured to receive and amplify the RF input signal to provide an RF transmit signal using an envelope power supply voltage;

    an envelope tracking power supply is configured to provide the envelope power supply voltage based on a setpoint, which has been constrained to limit a noise conversion gain (NCG) of the RF PA to not exceed a target NCG, wherein the envelope power supply voltage at least partially tracks an envelope of the RF transmit signal; and

    RF transceiver circuitry comprises the envelope control circuitry and the RF modulator, such that the setpoint, which has been constrained to limit the NCG of the RF PA, is a constrained setpoint, such that the RF transceiver circuitry is configured to provide the constrained setpoint to the envelope tracking power supply via the envelope power supply control signal.

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