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1 GHz leading zero anticipator using independent sign-bit determination logic

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2 Author(s)
Lee, K.T. ; IBM Austin Res. Lab., TX, USA ; Nowka, K.J.

The architecture and design methodology of a leading zero anticipator (LZA) using built-in sign-bit determination logic are described. The LZA was implemented in the 1 GHz floating point unit using a 1.8 V, 0.12/0.15(n/p)/spl mu/m L/sub eff/ IBM CMOS technology. The design shows 730 ps of latency and operates at 1 GHz with 5 levels of delayed reset dynamic circuit logic. With the LZA the sign-bit is determined in 446 ps with an area overhead of 8%, whereas a conventional adder generates the sign-bit in 770 ps.

Published in:

VLSI Circuits, 2000. Digest of Technical Papers. 2000 Symposium on

Date of Conference:

15-17 June 2000

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