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Charge coupled device differencer

  • US 4,686,648 A
  • Filed: 12/03/1985
  • Issued: 08/11/1987
  • Est. Priority Date: 12/03/1985
  • Status: Expired due to Term
First Claim
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1. A charge coupled device differencer comprising:

  • a semiconductor substrate (10);

    first charge transfer means (12 and

         16) formed on said substrate for receiving and transferring a first quantity of charge carriers;

    second charge transfer means (24 and

         28) formed on said substrate for receiving and transferring a second quantity of charge carriers;

    a first charge subtraction means (34 and

         36) coupled to said first charge transfer means and responsive to said first quantity of charge carriers so as to form a first potential well in said substrate having a level determined by said first quantity of charge carriers;

    second charge subtraction means (42 and

         44) coupled to said second charge transfer means and responsive to said second quantity of charge carriers so as to form a second potential well in said substrate having a level determined by said second quantity of charge carriers; and

    charge reservoir means (144) for injecting a third quantity of charge carriers into said first and second potential wells and for removing a fourth quantity of charge carriers from said first and second potential wells, said fourth quantity of charge carriers being less than said third quantity of charge carriers when said first quantity of charge carriers is greater than said second quantity of charge carriers whereby the difference between said third and fourth quantity of charge carriers remains in said second potential well and represents the difference between said first and second quantity of charge carriers.

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