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Impedance measuring circuit

  • US 9,329,216 B2
  • Filed: 01/29/2013
  • Issued: 05/03/2016
  • Est. Priority Date: 10/02/2009
  • Status: Active Grant
First Claim
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1. A circuit element parameter network, comprising:

  • a transconductance amplifier having first and second inputs and first and second outputs;

    a first detector having a first input and an output, the first input of the first detector coupled to the first output of the of the transconductance amplifier;

    a first converter having an input and a first output, the first input of the first detector coupled to the first output of the first converter; and

    a second detector having a plurality of inputs and an output, a first input of the second detector coupled to the first output of the first converter and the second input of the second detector coupled for receiving the first signal, wherein the first detector comprises;

    a first modulator having first and second inputs and an output; and

    a first low pass filter having an input and an output, the input of the first low pass filter coupled to the output of the first modulator and the output of the first low pass filter serving as the output of the first detector, and the second detector comprises;

    a second modulator having first and second inputs and an output;

    a phase shifting element having an input and an output, the input serving as the first input of the second detector; and

    a second low pass filter having an input and an output, the input of the second low pass filter coupled to the output of the second modulator and the output of the second low pass filter serving as the output of the second detector.

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