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High frequency amplifier circuit

  • US 6,111,461 A
  • Filed: 10/14/1998
  • Issued: 08/29/2000
  • Est. Priority Date: 10/15/1997
  • Status: Expired due to Term
First Claim
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1. A high frequency amplifier circuit comprising a voltage supply means for supplying a power source voltage to an output side of a high frequency amplifying active element, said supply means including:

  • signal detecting means for detecting a difference frequency signal of an input signal at a frequency lower than said input signal of said high frequency amplifier circuit; and

    signal attenuation means for attenuating said difference frequency signal from an output signal by controlling said power source voltage on the basis of said difference frequency signal detected by said signal detecting means.

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