CCD Input circuits
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United States of America
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Jun 26, 1984
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N/A
app pub date -
Jun 1, 1981
filing date -
Aug 2, 1977
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Abstract
The circuits include a floating diffusion, a source supplying a controllable amount of charge to the floating diffusion and a charge coupled device (CCD) reference register for periodically removing a fixed amount of charge from the floating diffusion. A feedback circuit senses the average voltage at the floating diffusion and adjusts the controllable amount of charge supplied to the diffusion to maintain its average voltage-level constant. The feedback circuit may be employed automatically to control the direct voltage bias at the input electrode of a DDC signal register. It may alternatively be employed to control a radiation source serving as the input to the system, or to operate a circuit for indicating the frequency at which the reference CCD register is being driven, or as an input to a current mirror amplifier.
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