Switch circuit and method of switching radio frequency signals

  • US 7,860,499 B2
  • Filed: 12/01/2008
  • Issued: 12/28/2010
  • Est. Priority Date: 10/10/2001
  • Status: Active Grant
First Claim
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1. An RF switch circuit for switching RF signals, comprising:

  • a) a first RF port capable of outputting or receiving a first RF signal;

    b) a second RF port capable of outputting or receiving a second RF signal;

    c) a switch transistor grouping having a first node coupled to the first RF port and a second node coupled to the second RF port, wherein the switch transistor grouping is controlled by a first switch control signal (SW); and

    d) a shunt transistor grouping having a first node coupled to the first RF port and a second node coupled to ground, wherein the shunt transistor grouping is controlled by a second switch control signal (SW);

    wherein the RF switch circuit is fabricated in a fully integrated device, wherein the fully integrated device includes a negative voltage generator coupled to the RF switch circuit wherein the negative voltage generator generates a negative power supply voltage, and wherein the negative voltage generator comprises a charge pump circuit;

    and wherein when the first switch control signal SW is enabled, the switch transistor grouping is enabled and the shunt transistor grouping is disabled thereby electrically coupling the first RF port to the second RF port, and wherein when the second switch control signal SW is enabled, the shunt transistor grouping is enabled while the switch transistor grouping is disabled thereby shunting the first RF port to ground.

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