Continuous time correlator architecture
US8643619B2 · kind B2 · utility
4Cited by
7References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2012 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Aug 5, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An analog front end circuit utilizes coherent detection within a capacitance measurement application. The analog front end circuit uses coherent detection to measure capacitance of a touch screen display. An analog excitation signal is modulated by a capacitor to be measured. The modulated signal is synchronously demodulated using a correlator, which includes an integrated mixing and integration circuit. The correlator includes a programmable impedance element that generates a time-varying conductance according to a controlling digitized waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.