Patent Number: 6,294,945

Title: System and method for compensating the dielectric absorption of a capacitor using the dielectric absorption of another capacitor

Abstract: A system and method, wherein the dielectric absorption of a capacitor is cancelled by a compensating circuit. One embodiment uses a compensation circuit comprising a compensating capacitor with substantially identical characteristics as the capacitor to be compensated in an integrator circuit. The effects of the dielectric absorption of the capacitor in the integrator circuit are reduced or eliminated because the dielectric absorption of the compensating capacitor cancels the dielectric absorption of the capacitor in the integrator circuit. Another embodiment uses compensation circuitry to reduce or eliminate the effects of dielectric absorption in any particular capacitor. The compensation capacitor in the compensation circuitry has a higher rate of dielectric absorption and a lower capacitance value than the capacitor whose dielectric absorption effects are to be reduced or eliminated. In another embodiment, the effects of the dielectric absorption of a capacitor are reduced or eliminated by choosing a compensation capacitor in the compensation circuitry with the same dielectric absorption as the capacitor to be compensated. The dielectric absorption of the compensation capacitor is scaled by the resistors in the compensation circuitry which determine the gain of the amplifier in the compensation circuitry.

Inventors: Regier; Christopher G. (Cedar Park, TX), Daigle; Clayton (College Station, TX)

Assignee: National Instruments Corporation

International Classification: G06G 7/186 (20060101); G06G 7/00 (20060101); G06G 007/19 ()

Expiration Date: 09/25/2018