Capacitance difference detecting circuit and capacitance difference detecting method
US8264244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2010 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | May 2, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960745
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance difference detecting circuit includes a control circuit, for generating a control signal according to a first voltage and a second voltage; a first capacitor to be detected; a second capacitor to be detected; a first constant capacitor, having a terminal coupled to the first terminal of the first capacitor to be detected and the first input terminal; a second constant capacitor, having a terminal coupled to the first terminal of the second capacitor to be detected and the second input terminal; a voltage control unit, cooperating with the first capacitor to be detected, the second capacitor to be detected, the first constant capacitor and the second constant capacitor to control the first voltage and the second voltage. The voltage control unit is an adjustable capacitor and a capacitance value of the adjustable capacitor is controlled by the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.