Capacitive integrate and fold charge-to-digital converter
US7936299B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2009 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | Jul 11, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/56
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for converting a charge signal into a binary format of output bits comprises: an integration circuit including an operational transconductance amplifier having an inverting input terminal and an output terminal, an integrating capacitor connected between the inverting input terminal and the output terminal, the integrating capacitor for storing a charge input selectively provided by a sensor diode; and a folding circuit having a fold capacitor, the fold capacitor switchably coupled either to a fold voltage source via a fold buffer for charging the fold capacitor to a predetermined fold charge value, or to the integrating capacitor for selectively removing at least a portion of the stored charge input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.