发明名称 |
READ-OUT CIRCUIT FOR A PHOTODETECTOR |
摘要 |
A read-out circuit for a photodetector incorporates a photodiode detector (1) connected via a preamplifier (2) to a storage capacitor (Cs). The capacitor (Cs) is also connected to a constant current circuit (Cc, T3 to T7) providing a correction current controlled by a voltage on a reference capacitor (Cc). The reference capacitor (Cc) is charged by the amplified photodiode output current during a calibration phase. During a measurement phase, the storage capacitor (Cs) integrates the difference between the amplified photodiode output current and the correction current. This provides pedestal signal subtraction at the signal integration point. An array of photodetectors may be provided with a corresponding array of read-out circuits integrated in a single semiconductor substrate. |
申请公布号 |
WO9003080(A1) |
申请公布日期 |
1990.03.22 |
申请号 |
WO1989GB01014 |
申请日期 |
1989.08.31 |
申请人 |
THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNI |
发明人 |
BALLINGALL, RONALD, ALEXANDER;BLENKINSOP, IAN, DUNCOMBE |
分类号 |
H04N5/33;H04N5/359;H04N5/361;(IPC1-7):H04N5/217 |
主分类号 |
H04N5/33 |
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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