Device for subtracting or adding a constant amount of charge...

Details Device for subtracting or adding a constant amount of charge... Device for subtracting or adding a constant amount of charge...

2006-02-21

2006-02-21

Lam, Tuan T. (Department: 2816)

Electrical pulse counters, pulse dividers, or shift registers: c

Charge transfer device

C377S062000, C377S063000

Reexamination Certificate

active

07003068

ABSTRACT:
A circuit for adding or subtracting an amount of charge from a charge sample, such as in a Charge Coupled Device (CCD), by portioning and pipelining the processing stages, to avoid introducing a memory effect. The operation, such as subtraction, is split into multiple stages, with each stage responsible for removing only a portion of the total amount of charge that is desired to be removed. The subtraction pipeline stages operate together to remove the total desired charge amount. In one embodiment each successive subtraction stage removes a corresponding lesser amount of charge. As a result, greater accuracy in the amount of charge removed is achieved as well operation at higher frequencies than previous charge subtraction approaches.

REFERENCES:
patent: 3999082 (1976-12-01), Early
patent: 5091922 (1992-02-01), Uehira
patent: 5760430 (1998-06-01), Kato

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