Charge coupled device subtractor

Details Charge coupled device subtractor Charge coupled device subtractor

1981-01-12

1984-10-09

Munson, Gene M.

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

Charge transfer device

Particular input or output means

357 24, G11C 1928, H01L 2978

Patent

active

044765681

ABSTRACT:
A non-destructive charge subtraction output system for charge coupled devices (CCD) in which a floating electrode is clamped in the presence of a first charge so that when the first charge leaves the potential well and a second charge enters, the signal sensed is representative of the difference between the first and second charges with excellent common mode rejection, high bandwidth, and low power. The system operates so as to either provide a difference of adjacent charges along a channel either with or without an isolating bit or bits or to provide subtraction of the charges selected along a sequence of charges passing through the CCD channel. One use of the system in accordance with the invention is to sense moving targets in a scene having a substantially fixed or non-moving background.

REFERENCES:
patent: 3623132 (1971-11-01), Green
patent: 3801883 (1974-04-01), Tiemann
patent: 3999152 (1976-12-01), Sato et al.
patent: 4034199 (1977-07-01), Lampe et al.
patent: 4123733 (1978-10-01), Poierier
Engeler et al., "The Surface-Charge Transistor", IEEE Trans. Electron Devices, vol. ED-18, (12/78), pp. 1125-1136.
Melen et al., "One-Phase CCD: A New Approach to Charge Coupled Device Clocking", IEEE J. Solid-State Circuits, vol. SC-7, (2/72), pp. 92-93.
Sequin et al., Charge Transfer Devices, Academic Press, N.Y., (1975), pp. 18-21, 38, 39, 47-53, 70-73, 98-101, 218, 219.
MacLennan, "Charge-Coupled Devices-Signal Processing", Wireless World, (2/75), pp. 61-65.

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