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Apparatus for AC-to-DC conversion which provides a signed DC signal

  • US 6,442,210 B1
  • Filed: 07/24/2001
  • Issued: 08/27/2002
  • Est. Priority Date: 07/24/2000
  • Status: Expired due to Fees
First Claim
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1. An apparatus for obtaining phase and amplitude signal information from a displacement transducer that is excited by an AC excitation signal and provides an AC input signal indicative of transducer position, said apparatus comprising:

  • a first rectifier circuit that receives and sums the AC excitation signal and the AC input signal, and rectifies the sum to provide a rectified summed excitation and input signal indicative thereof;

    a second rectifier circuit that receives and rectifies the AC excitation signal and provides a rectified excitation signal indicative thereof; and

    a summing circuit that receives and determines the differences between said rectified summed excitation and input signal and said rectified excitation signal to provide a signed DC signal indicative of displacement transducer position.

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