发明名称 |
ELECTRICAL CIRCUIT, APPARATUS AND METHOD FOR THE DEMODULATION OF AN INTENSITY-MODULATED SIGNAL |
摘要 |
<p>A modulated optical radiation field (I) whose modulation amplitude and temporal phase depend on the local position can be detected with a plurality of pixels 1. Each pixel 1 consists of a transducing stage (T) that converts incoming light (I) into a proportional electric signal, a sampling stage (S), two subtraction/summation stages (SUB1, SUM1; SUB2, SUM2), and an output stage. Each pixel can be addressed individually. The optical radiation field (I) is locally sensed and sampled at a frequency that is four times the wavefield's modulation frequency. The subtraction/summation stages (SUB1, SUM1; SUB2, SUM2) accumulate differences of two samples per modulation period, separated by half the period, during several averaging periods; the two stages are time shifted with respect to each other by a quarter period. The resulting two output signals are employed for the determination of the local envelope amplitude and the temporal phase. These pixels 1 can be realized with circuits that consume very little electric power and require small areas, enabling the realization of large numbers of pixels in linear or two-dimensional array sensors.</p> |
申请公布号 |
WO2004082131(A1) |
申请公布日期 |
2004.09.23 |
申请号 |
WO2004CH00122 |
申请日期 |
2004.03.03 |
申请人 |
CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA;BEER, STEPHAN;SEITZ, PETER |
发明人 |
BEER, STEPHAN;SEITZ, PETER |
分类号 |
H03D7/02;(IPC1-7):H03D3/00 |
主分类号 |
H03D7/02 |
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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