Adder

Details Adder Adder

1987-09-28

1989-03-28

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 750

Patent

active

048170313

ABSTRACT:
In a carry adder of Manchester type, a carry is generated for each full adder and transmitted from a less significant bit to a more significant bit via a series-connected pass transistors. To increase the carry transmission speed, a carry skip circuit is usually connected across pass transistors classified as a block. However, since the skip circuit is still connected to turn-on resistances and stray capacitances of the pass transistors, the carry transmission speed is low and unstable. To overcome this problem, the skip circuit is selectively disconnected from the pass transistors, in response to a NAND signal indicative of the absence of carry signals of the full adder in the same block, by means of two mate clocked inverters alternatively activated by two opposite-level clocks .phi. and .phi..

REFERENCES:
patent: 3728532 (1973-04-01), Pryor
patent: 4764887 (1988-08-01), Lai et al.

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