Readout of a densely packed CCD

Details Readout of a densely packed CCD Readout of a densely packed CCD

1978-08-24

1979-12-11

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

357 24, 357 30, 307221D, 365183, H04N 314, H01L 2710, H01L 2978, H01L 3110

Patent

active

041786149

ABSTRACT:
High vertical resolution can be obtained in a charge-coupled device (CCD) imager of the field transfer type by integrating charge in the A register in storage potential wells separated by potential barriers, with no empty potential wells separating the storage wells. Transfer of the integrated charge from the A to the B register at a speed which meets commercial television standards is obtained by employing a new type of multiple-phase clocking. Starting with the first row of charges S.sub.j =S.sub.1, the clock pulses successively separate each row of charges S.sub.j from the following row S.sub.j+1 by a space for a potential well and a potential barrier, and in synchronism with each such separation, the clock pulses shift the rows S.sub.j-1, S.sub.j-2. . . , if any, which previously have been separated, in unison, all by one row position. Then, after the first row of charges S.sub.1 from the A register reaches the first row of the B register it becomes statically stored there, and the process reverses, that is, the spaces between adjacent rows of charges successively are eliminated, to obtain high charge packing density in the B register and to completely empty the A register. Then the B-to-C register readout is accomplished in a manner similar to the first part of the A-to-B register readout.

REFERENCES:
patent: 3967254 (1976-06-01), Kosonocky et al.
patent: 4094009 (1978-06-01), Schneider et al.
Collins et al., "CCD and Photosensitive Devices," 1973 IEEE International Solid-State Circuits Conference, Feb. 15, 1973, pp. 136, 137 and 210.

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