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Radio-frequency switch circuit

  • US 8,170,500 B2
  • Filed: 07/09/2009
  • Issued: 05/01/2012
  • Est. Priority Date: 09/25/2008
  • Status: Active Grant
First Claim
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1. A radio-frequency switch circuit comprising:

  • an antenna terminal;

    two or more radio-frequency terminals;

    n-stage through FETs (field effect transistors) connected in series between the antenna terminal and each of the radio-frequency terminals, where n is a natural number;

    a radio-frequency leakage prevention resistor, one end of the radio-frequency leakage prevention resistor being connected to a gate of the through FETs;

    a control signal line commonly connected to another ends of the radio-frequency leakage prevention resistors; and

    a resistor inserted in each of at least two of the control signal lines between the another end of the radio-frequency leakage prevention resistor and a control circuit supplying a control signal to the n-stage through FETs,each portion of the two control signal lines being capacitively coupled between the resistor and the another end of the radio-frequency leakage prevention resistor.

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