×

Capacitive temperature compensation for a pressure sensor

  • US 4,807,477 A
  • Filed: 02/01/1988
  • Issued: 02/28/1989
  • Est. Priority Date: 02/01/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. A capacitor temperature compensation circuit for use at a predetermined operative frequency of an operative electrical signal to be applied to and/or determined by a capacitor, comprising:

  • a first capacitor connected between two end terminals, said first capacitor having a predetermined temperature coefficient of capacitance (TCC) with a predetermined polarity and providing a predetermined capacitive impedance at a predetermined operative signal frequency of a signal to be applied to and/or determined by said first capacitor;

    an additional compensation capacitor connected in series with a resistor, said additional capacitor having a predetermined temperature coefficient of capacitance with a predetermined polarity opposite to said first capacitor temperature coefficient of capacitance polarity, said series connection of said additional capacitor and said resistor being connected in parallel with said first capacitor across said two end terminals; and

    means for providing, at at least one of said two end terminals, a signal having a predetermined operative signal frequency, said resistor providing a nonnegligible resistive impedance at said predetermined operative signal frequency as compared to said first capacitor impedance and said additional capacitor impedance at said predetermined operative signal frequency, whereby the composite temperature coefficient of capacitance of said first and additional capacitors across said two end terminals is effectively determined by the magnitude of said resistor impedance.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×