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Electrically tuned integrated amplifier for wireless communications

  • US 6,509,799 B1
  • Filed: 11/09/2000
  • Issued: 01/21/2003
  • Est. Priority Date: 11/09/2000
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) amplifier comprising:

  • a resonant circuit having a plurality of circuit elements, said plurality of circuit elements including a voltage variable capacitance, said resonant circuit having a resonant frequency that depends upon a present value of said voltage variable capacitance; and

    a voltage adjustment unit in communication with said voltage variable capacitance to vary a bias voltage on said voltage variable capacitance to modify a capacitance value thereof;

    wherein said voltage variable capacitance is a diffusion capacitance associated with a first transistor within the RF amplifier, and wherein said voltage adjustment unit includes a third transistor having an input terminal to receive a control signal, said third transistor to vary a voltage drop between a supply node and said first transistor in response to variations in said control signal.

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