Offset compensation circuit for charge-coupled devices

Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock

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307311, 357 24, 357 30, H03K 3353, H03K 342, H01L 2978, H01L 2714

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active

043000622

ABSTRACT:
A circuit for removing the DC or background representing charge component of a signal to be retrieved from a charge-coupled device to individually compensate for variations of each charge-coupled device circuit. A threshold gate is interposed in a charge flow path between a charge integrating well and an output charge transfer gate. The threshold gate is connected to a potential level which is automatically adjusted to compensate for DC variations in a fixed level of the charge to be extracted from the integrating well. A feedback connection between the threshold gate and the integrating well adjusts the potential level during the integration of a reference charge between the integration of an information signal charge.

REFERENCES:
patent: 3876952 (1975-04-01), Weimer
patent: 3969634 (1976-07-01), Su et al.
patent: 4135104 (1979-01-01), Allen
patent: 4162411 (1979-07-01), Sakaue et al.
Sequin et al., Charge Transfer Devices, Academic Press, N.Y. (1975) pp. 48-50, 58-59, 270-274.
Zimmerman et al., "A New Role for Charge-Coupled Devices . . . " Electronics (Mar. 31, 1977) pp. 97-103.

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