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DIFFERENTIAL CAPACITANCE CIRCUITRY FOR DIFFERENTIAL PRESSURE MEASURING INSTRUMENTS

  • US 3,688,190 A
  • Filed: 09/25/1970
  • Issued: 08/29/1972
  • Est. Priority Date: 09/25/1970
  • Status: Expired due to Term
First Claim
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1. Capacitance measuring circuitry comprising:

  • a. a source of alternating current;

    b. a first capacitor having two plates, connected on one plate to a first terminal of the alternating current source;

    c. a second capacitor having two plates connected on one plate to the same terminal of the alternating current source;

    d. a first diode connected at its anode to the second plate of the first capacitor;

    e. a second diode connected at its cathode to the second plate of the first capacitor;

    f. a filter network connected to the cathode of the first diode and the anode of the second diode, the anode of the second diode being connected to a second terminal of the alternating current source;

    g. a third diode connected at its cathode to the second plate of the second capacitor; and

    h. a fourth diode connected at its anode to the second plate of the second capacitor;

    the anode of the third diode and the cathode of the fourth diode being connected to the filter network and the anode of the third diode being connected to the second terminal of the alternating current source.

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