发明名称 |
LIGHT SOURCE FREQUENCY DETECTION CIRCUIT USING BIPOLAR TRANSISTOR |
摘要 |
An apparatus for measuring the power frequency of a light source includes a photo-sensitive transistor, a modulator 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.
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申请公布号 |
US2009128660(A1) |
申请公布日期 |
2009.05.21 |
申请号 |
US20070942604 |
申请日期 |
2007.11.19 |
申请人 |
OMNIVISION TECHNOLOGIES, INC. |
发明人 |
DAI TIEJUN;MANABE SOHEI;YAO HONGTAO;ZHANG JINGZHOU;DENG LIPING |
分类号 |
G01J1/18;G01J9/00;H01L29/73;H04N5/369;H04N5/58 |
主分类号 |
G01J1/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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