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Radio-frequency switch circuit and semiconductor device

  • US 20060103448A1
  • Filed: 11/17/2005
  • Published: 05/18/2006
  • Est. Priority Date: 11/17/2004
  • Status: Active Grant
First Claim
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1. A radio-frequency switch circuit for controlling flow of a radio-frequency signal, comprising:

  • a plurality of field-effect transistors inserted between an input/output terminal and a ground terminal and connected in series, a radio-frequency signal being input and output through the input/output terminal; and

    a plurality of resistance elements, wherein each of the plurality of resistance elements has two terminals, one of the two terminals is connected to a gate electrode of a corresponding one of the plurality of field-effect transistors, and a control voltage for switching an ON state and an OFF state of the corresponding field-effect transistor is applied to the other of the two terminals, wherein one of the plurality of resistance elements connected to a gate electrode of one of the plurality of field-effect transistors connected to the input/output terminal has a highest resistance value among the plurality of resistance elements.

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