Direct coupling of a capacitive sensor to a delta-sigma converter
US10317250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2016 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Jul 29, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Embodiments of an apparatus for direct coupling of a capacitive sensor to a delta-sigma converter are described. One apparatus includes a sensor, a charge coupling circuit configured to transfer at least a portion of charge generated by the sensor to an integrating circuit, a first charge feedback circuit configured to feed back charge to the sensor, a second charge feedback circuit configured to feed back charge to the integrating circuit, a comparing circuit configured to detect accumulated charge at the integrating circuit for a current cycle to determine a polarity of charge feedback for a subsequent cycle, and a logic circuit configured to provide a digital output corresponding to the sensed quantity and also configured to provide the polarity of charge feedback determined by the comparing circuit to the first charge feedback circuit and also to the second charge feedback circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.