Signal processing circuit and method using analog voltage signal to pulse width modulation conversion
US7247832B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2005 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Sep 9, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal processor and processing method are provided for measuring current received from a photo-detector. Generally, the processor includes a transimpedance amplifier (TIA) to integrate a current received from a photo-detector in the optical navigation system to generate a voltage signal having a slope that is proportional to the received current, and a comparator having a first input coupled to an output of the TIA to receive the voltage signal, and a second, inverting, input coupled to a threshold voltage. The comparator is configured to compare the voltage signal to the threshold voltage and to generate an output pulse having a predetermined voltage and a duration or width that is a function of the received current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.