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Amplifier and biasing circuit therefor

  • US 5,559,471 A
  • Filed: 12/21/1994
  • Issued: 09/24/1996
  • Est. Priority Date: 12/21/1994
  • Status: Expired due to Term
First Claim
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1. A power amplifier for amplifying a radio frequency (RF) signal, the power amplifier having a RF input signal and a RF output signal, the power amplifier comprising:

  • an amplifier stage having a gate threshold voltage, a drain port, a gate port and a source port, the source port is connected to an electrical ground, the gate port is coupled to receive the RF input signal, the drain port is coupled to provide the RF output signal;

    a main power supply coupled to the drain port of the amplifier stage;

    a biasing power supply circuit coupled to receive the RF input signal, the RF input signal being the power supply for the biasing power supply circuit, the biasing power supply circuit to generate a RF generated negative biasing voltage and to supply the RF generated negative biasing voltage to the amplifier stage; and

    a gate threshold tracking circuit coupled to the gate port of the amplifier stage to track the RF generated negative biasing voltage.

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