Signal monitoring and control system for an optical navigation sensor
US8541727B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2008 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Nov 27, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/4228
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit and method are provided to control the strength of signals from an array of photo-detectors (PDs) in an optical navigation sensor. The circuit includes a number of transimpedance-amplifiers (TIAs) each coupled to an output of at least one PD to receive a current signal therefrom and generate a signal in response thereto. A controller coupled to outputs of the TIAs receives the signals and executes an algorithm to adjust gain of a signal processor coupled to the array. In one embodiment, the signal processor includes differential transimpedance-amplifiers (DIFF-TIAs) each including inputs coupled to receive current signals from the array, and the controller outputs a control signal to adjust a time over which the DIFF-TIAs and the TIAs integrate the current signals. Optionally, the signal processor includes gain-amplifiers coupled to the DIFF-TIAs and TIAs, and the controller outputs a signal to adjust gain thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.