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A clock distribution network for microprocessors

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16 Author(s)
Restle, P.J. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; McNamara, T.G. ; Webber, D.A. ; Camporese, P.J.
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A global clock distribution strategy implemented on several microprocessor chips is described. The clock network consists of buffered, tunable tree networks, with the final trees all driving a common grid. This topology combines advantages of both trees and grids. A new tuning method was required to efficiently tune a single interconnect network with 6 m of wire and 50,000 resistors, capacitors, and inductors. Global clock skew as low as 22 ps was measured for large microprocessor chips.

Published in:

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

Date of Conference:

15-17 June 2000