Low voltage serial to parallel to serial charge coupled device
AssigneeInternational Business Machines Corporation
InventorsJohn J. Byrne, Jean M. Ferre, Yelandur R. Gopalakrishna
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Abstract
This serial to parallel to serial (SPS) charge coupled device (CCD) shift register memory has a serial output shift register with stage gate electrode structures that are interdigitated with the gate electrode structures of each last stage of a plurality of parallel shift registers to transfer interlaced data bits from the parallel shift registers to the serial output register in a sequential order. This is done without employing a fixed voltage midway between the highest clock voltage and reference potential in the parallel registers in what is commonly called a midway store to regulate the transfer of data to the interdigitated gate electrode structures.
Claims3
A serial to parallel to serial charge coupled device shift register memory of the type having a plurality of channels in a semiconductor substrate with transfer diodes positioned thereover activated by a series of sequential transfer pulses for transfer of data in the form of charge packets along the parallel channel to form parallel shift registers and additional channel for a single serial shift register at the output ends of said plurality of parallel channels, comprising,
- a plurality of gate electrodes of two different lengths overlying the channel of said serial register with the longer electrodes also overlying the ends every other of the plurality of channels for said parallel shift registers and the shorter gate electrodes positioned between each two longer electrodes at the end of the intervening channels for the parallel registers,
- a single gate electrode overlying all of the channels of said parallel shift register adjacent to said plurality of said gate electrodes and having extensions juxtaposed between said longer electrodes and facing said shorter electrodes, said single gate electrode being activated by one of said series of sequential pulses, and
- transfer electrode means overlying said longer of the plurality of gate electrodes and said extensions for transfer of data from said parallel registers to said serial registers in two groups.
Dependencies are inferred from the claim text.