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Variable-gain amplifier

  • US 7,649,418 B2
  • Filed: 06/11/2007
  • Issued: 01/19/2010
  • Est. Priority Date: 06/12/2006
  • Status: Active Grant
First Claim
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1. A variable-gain amplifier comprising:

  • n number/numbers of cascode amplifiers each including a plurality of cascode-connected field effect transistors, n being an integer not fewer than two; and

    an attenuator;

    wherein said n number/numbers of cascode amplifiers are mutually connected in parallel via said attenuator,wherein a first-stage cascode amplifier among the n number/numbers of cascode amplifiers comprises a first field effect transistor among the plurality of cascode-connected field effect transistors, andwherein an operating point of the first field effect transistor is transferred from a saturation region to a linear region during an intermediate stage of operation of the variable-gain amplifier.

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