Low-power, high-speed word comparator

Details Low-power, high-speed word comparator Low-power, high-speed word comparator

2004-02-25

2008-10-14

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C340S146200

Reexamination Certificate

active

07437402

ABSTRACT:
Apparatus and method for performing a high-speed, low-power bit-wise comparison of two digital words. For each bit, a bit comparator is shown, employing a compare node and a discharge node. After both nodes are charged, the discharge node is discharged and the condition of the compare node signals the result of the comparison. For each bit, a bit comparator is provided including a single transistor switch across the compare node and the discharge node. An exclusive-OR circuit connected to receive the corresponding bits of the words drives and selectively actuates the switch when the values of the corresponding bits are mismatched. Words may be segmented such that comparisons may be done segment-wise and the detection of a mismatch in any segment obviates the discharging of the compare node in segments containing more significant bits, to save power.

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patent: 6292818 (2001-09-01), Winters
patent: 2002/0149471 (2002-10-01), Coppin

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