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Charge collection control circuit for use with charge-coupled photodetector arrays
| Details |
Inventors: Bowlby, Jr., James O.; Johnston, Gregory E.; Malm, Robert E.;
Assignee: X-Ray Scanner Corporation (Torrance, CA)
Primary Examiner: Nelms; David C.
Assistant Examiner:
Attorney, Agent or Firm: Malm; Robert E.
The charge collection control circuit generates a time-varying voltage that is used to control the charge collection process in an MOS photodetector for the purpose of obtaining greater dynamic range. Control is exercised either by means of an integration control electrode that controls the flow of charge from a charge-collecting region to a sink or by means of a transfer electrode that controls the flow of charge from the charge-collecting region to a charge-transport region through which the collected charge flows to an output circuit. |
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DETAILED DESCRIPTION What is claimed is: 1.
A charge collection control circuit for use with an imaging system comprising a plurality of photodetector cells, each photodetector cell comprising a charge-collecting region, a charge-transport region, a sink region, an integration control electrode, and a transfer electrode, said charge-collecting region being used to store charge generated by light incident on said cell during each of a plurality of exposures, all of said exposures being equal in duration, said imaging system generating a start signal at the beginning of each exposure, said sink region being used as a means for disposing of excess charge in said charge-collecting region, said charge-transport region being used to receive and temporarily store charge collected in said charge-collecting region, the transfer of charge from said charge-collecting region to said sink region being controlled during an exposure by a charge collection control voltage applied to said integration control electrode, the magnitude of said charge collection control voltage at a particular time establishing the amount of charge that can be stored in said charge-collecting region at said particular time, the transfer of charge from said charge-collecting region to said charge-transport region being controlled by a transfer voltage applied to said transfer electrode, the transfer of charge being accomplished by a change in said transfer voltage from a first value to a second value, said charge collection control circuit comprising: a means for storing a representation of a charge collection control function, said function being a continuous function of time defined for a time period extending from zero to a time equal to the duration of an exposure; a means for retrieving said representation from said storing means and generating said charge collection control voltage from said stored representation each time a start signal is inputted, the zero reference time of said representation corresponding to the time at which said start signal is inputted
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Audio Signal Processing 
