H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/128
H03K 19/21 (2006.01) G06F 7/50 (2006.01) H03K 19/094 (2006.01)
Patent
CA 1167936
- 13 - ABSTRACT IMPROVEMENTS IN OR RELATING TO CARRY CIRCUITS A chain-type ripple-carry generating circuit having a plurality of cascaded stages is provided with a regeneration network in each stage for restoring the logic level of a carry signal propagating through the stage. In one embodiment of the invention the regeneration network is designed to restore a carry-not bit and comprises an MOS transistor having its conduction channel coupled between the input of the stage and a ground terminal, the gate of the transistor being driven by a two-input NOR gate, one input of the NOR gate being connected to receive a precharge clock signal and the other input being connected to the input of the stage. When the precharge clock signal is at a logic "0" level and the input of the stage receives a carry-not bit at a logic "0" level, the NOR gate drives the MOS transistor into conduction causing the input of the stage to be pulled to substantially ground potential.
382753
Kirby Eades Gale Baker
Western Electric Company Incorporated
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