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Bypassable amplifier

  • US 6,137,354 A
  • Filed: 05/18/1998
  • Issued: 10/24/2000
  • Est. Priority Date: 05/18/1998
  • Status: Expired due to Term
First Claim
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1. A method for dynamically improving the efficiency of an RF amplifier, the method comprising:

  • amplifying an RF signal through a driver;

    providing the flow of power to said RF amplifier and amplifying said RF signal through said RF amplifier in response to a high RF output power condition;

    impeding the flow of power to said RF amplifier and bypassing further amplification of said RF signal through said RF amplifier in response to a low RF output power condition;

    wherein said power provided to said RF amplifier produces a supply current in said RF amplifier during a high RF output power condition, the method further comprising the steps;

    producing a signal;

    producing a supply current tracking signal indicating the present level of said supply current;

    determining the difference between at least said signal and at least said supply current tracking signal to obtain a gate biasing signal; and

    varying said supply current in proportion to said gate biasing signal.

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