Fast charge transfer analog-to-digital converter

Details Fast charge transfer analog-to-digital converter Fast charge transfer analog-to-digital converter

1980-04-25

1983-02-22

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

357 24, 340347M, H03K 1308

Patent

active

043750591

ABSTRACT:
A charge coupled device analog-to-digital converter includes a plurality of charge storage stages that are arranged in a serial pipeline register and are connected to pass input source charges from stage to stage down the pipeline register. A reference charge generator and a charge splitter at each stage generate two fixed reference signals. The first of the reference signals is compared by a comparator to a source charge that is temporarily stored at the stage. The comparator generates a binary 1 if the source charge is greater than or equal to the first reference charge and a binary 0 if the source charge is less than the first reference charge. If a binary 1 is generated, only the stored contents of the stage pass to the next successive stage. However, if a binary 0 is generated, the charge contents of the stage is passed to a next successive stage and the second reference charge is also passed by a transfer gate to the next successive stage, where the charges are combined. Buffer registers are provided to temporarily store the output bits of the comparators of the stages to form a digital word for each source charge packet as the packet and associated added charge components leave the pipeline.

REFERENCES:
patent: 3100298 (1963-08-01), Fluhr
patent: 3156913 (1964-11-01), Crocker et al.
patent: 4072938 (1978-02-01), Buchanan
patent: 4072939 (1978-02-01), Heller et al.
Taub, Restandardizing Circuits for Analogue CCD Shift Register, IBM Technical Disclosure Bulletin, vol. 20, No. 1, 6/1977, pp. 379-382.

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