Charge coupled device ripple adder with nearly instantaneous car

Details Charge coupled device ripple adder with nearly instantaneous car Charge coupled device ripple adder with nearly instantaneous car

1981-09-18

1984-08-07

Malzahn, David H.

Boots, shoes, and leggings

G06F 750

Patent

active

044647280

ABSTRACT:
A ripple adder is implemented as a charge coupled device in such a manner that each carry bit propagates between succeeding full adder stages substantially simultaneously as each stage computes the sum of its two bits, so that the addition in each full adder stage may be carried out in parallel rather than in succession. The i.sup.th one of the CCD full adder stages includes charge transfer means for receiving two bits of charge, namely the i.sup.th bits of the two n-bit words which are to be summed. First and second charge storage means are provided, each having the capacity to store one bit of charge only, so that excess charge will cause an overflow. Means for sensing overflow charge stored in the second charge storage means is connected to a carry bit charge injector in the i.sup.th +1 adder stage.

REFERENCES:
patent: 3932734 (1976-01-01), Parsons
patent: 4032767 (1977-06-01), Lagnado
patent: 4135104 (1979-01-01), Allen
patent: 4170041 (1979-10-01), Handy et al.
Zimmerman et al., "Charge Coupled Device Digital Arithmetic Functions: Experimental Results", Third International Conference on Charge Coupled Devices, University of Edinburgh, 1976, pp. 190-196.
Handy, "Use of CCD in the Development of Digital Logic", IEEE Trans. on Electron Devices, vol.-24, No. 8, Aug. 1977, pp. 1049-1061.

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