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True root-mean-square detection with a sub-threshold transistor bridge circuit

  • US 8,060,040 B2
  • Filed: 08/18/2008
  • Issued: 11/15/2011
  • Est. Priority Date: 08/18/2008
  • Status: Active Grant
First Claim
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1. A detector circuit comprising a sub-threshold transistor bridge circuit, each of the four branches of the bridge circuit comprising a transistor configured to operate in the sub-threshold region over a predetermined range of input signal levels so that an input radio-frequency signal applied to a first pair of opposing corners of the bridge circuit yields a bridge output signal at the remaining pair of opposing corners, the bridge output signal having a low-frequency component substantially proportional to a squared-amplitude of an envelope of the input radio-frequency signal.

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