发明申请
- 专利标题： LIGHT SOURCE FREQUENCY DETECTION CIRCUIT USING BIPOLAR TRANSISTOR
- 专利标题（中）： 使用双极晶体管的光源频率检测电路
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申请号： US11942604申请日： 2007-11-19
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公开(公告)号： US20090128660A1公开(公告)日： 2009-05-21
- 发明人: Tiejun Dai , Sohei Manabe , Hongtao Yao , Jingzhou Zhang , Liping Deng
- 申请人： Tiejun Dai , Sohei Manabe , Hongtao Yao , Jingzhou Zhang , Liping Deng
- 申请人地址： US CA Sunnyvale
- 专利权人： OMNIVISION TECHNOLOGIES, INC.
- 当前专利权人： OMNIVISION TECHNOLOGIES, INC.
- 当前专利权人地址： US CA Sunnyvale
- 主分类号： G01J1/18
- IPC分类号： G01J1/18 ; H04N5/217
摘要：
An apparatus for measuring the power frequency of a light source includes a photo-sensitive transistor, a modulators and a logic unit. The photo-sensitive transistor generates an electrical signal that is responsive to light incident thereon from the light source. The modulator generates a modulated signal based on the electrical signal that toggles at a rate substantially proportional to the power frequency of the light source. The logic unit is coupled to receive the modulated signal and determine its toggling frequency.