Invention Grant
US08283620B2 Optical sensor and sensing method with stray illumination compensation
有权
光学传感器和杂散照明补偿的感测方法
- Patent Title: Optical sensor and sensing method with stray illumination compensation
- Patent Title (中): 光学传感器和杂散照明补偿的感测方法
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Application No.: US12555535Application Date: 2009-09-08
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Publication No.: US08283620B2Publication Date: 2012-10-09
- Inventor: Jeffrey M. Raynor , David P. Baxter
- Applicant: Jeffrey M. Raynor , David P. Baxter
- Applicant Address: GB Marlow, Buckinghamshire
- Assignee: STMicroelectronics (Research & Development) Ltd
- Current Assignee: STMicroelectronics (Research & Development) Ltd
- Current Assignee Address: GB Marlow, Buckinghamshire
- Agency: Gardere Wynne Sewell LLP
- Priority: GBGB0816592.0 20080911
- Main IPC: H03F3/08
- IPC: H03F3/08
Abstract:
An optical sensor includes an infra red LED, a photodetector and a lock in charge amplifier. The photodetector passes charge to a feedback capacitor of the charge amplifier following an illumination cycle during which the LED is emitting and also following an illumination cycle during which the LED does not emit. An amplifier presents an output indicative of the difference between the charge generated at the photodetector during the illuminated and non-illuminated cycles.
Public/Granted literature
- US20100065720A1 OPTICAL SENSOR AND SENSING METHOD Public/Granted day:2010-03-18
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