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Constant gate drive MOS analog switch

  • US 6,154,085 A
  • Filed: 09/08/1998
  • Issued: 11/28/2000
  • Est. Priority Date: 09/08/1998
  • Status: Expired due to Term
First Claim
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1. An analog switch coupled to an input terminal and an output terminal, comprising:

  • a first device including a source coupled to the input terminal, a drain coupled to the output terminal, and a gate;

    a second device including a source coupled to the input terminal, a drain, and a gate;

    a third device including a source coupled to the drain of the second device, a drain coupled to the output terminal, and a gate coupled to the gates of the first and second devices; and

    a level shifter including an input coupled to the drain of the second device and an output coupled to the gates of the first, second, and third device, the level shifter providing an approximately constant gate-to-source voltage relative to source-to-drain voltage of the first device.

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