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Apparatus and method for diffusion sensing

  • US 8,421,438 B2
  • Filed: 07/27/2010
  • Issued: 04/16/2013
  • Est. Priority Date: 06/07/2010
  • Status: Active Grant
First Claim
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1. An apparatus for sensing a bias voltage of a switch, the apparatus comprising:

  • a complimentary metal oxide semiconductor (CMOS) switch having a gate, a drain, a source, and a well, the source and drain formed in the well, the gate formed adjacent the well between the source and drain, and the source configured to receive a bias voltage from a power amplifier;

    a switch sense block configured to measure a signal indicative of the voltage of at least one of the source or drain of the switch and to generate an output signal based on the measurement; and

    a well bias control block for biasing the well of the switch, the well bias control block configured to bias the well to at least two voltage levels.

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