Capacitance measuring circuit
US10656191B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2017 |
| Grant date | May 19, 2020 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/955
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In various examples there is a capacitance measurement circuit for measuring capacitance of an electrode. The circuit comprises a charging/discharging circuit part which charges the electrode or discharges the electrode, and a counter which measures a charging measurement being a time taken by the charging/discharging circuit part to charge the electrode between two charging thresholds, and which measures a discharging measurement being a time taken by the charging/discharging circuit part to discharge the electrode between two discharging thresholds. The circuit has a controller configured to control the charging/discharging circuit part and the counter such that a plurality of discharging measurements are obtained and a plurality of charging measurements are obtained. The circuit has an averaging logic which computes the measured capacitance in relation to an average of the measurements. In this way high frequency and low frequency noise is attenuated and fine resolution, high accuracy capacitance measurements are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.