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CURRENT TRANSMITTER CIRCUITRY TO PROVIDE AN OUTPUT VARYING AS THE SQUARE ROOT OF A MEASURED VARIABLE CONDITION

  • US 3,854,039 A
  • Filed: 04/30/1973
  • Issued: 12/10/1974
  • Est. Priority Date: 04/30/1973
  • Status: Expired due to Term
First Claim
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1. A two wire current transmitter having first and second terminals for connection to a power source and to deliver a current signal proportional to the square root of a parameter including first means to provide an input signal which varies as a function of the parameter, a current control circuit providing a variable output current signal in response to a control signal, a squaring circuit having input means providing a first current signal which is a function of said variable output current signal and including second means providing a second signal proportional to the square of said first current signal, a comparison amplifier having an input coupled to the first means and second means and having an output providing a control signal which is a function of the input signal and the second signal, and means connecting the output of said comparison amplifier to provide said control signal to said control circuit and means connected to said first means, said control circuit, said squaring circuit and said comparison amplifier, respectively, to provide power therefore solely through said first and second terminals.

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