Teresa T Nguyen

US Patent:

62852299, Sep 4, 2001

Filed:

Dec 23, 1999

Appl. No.:

9/471898

Inventors:

Albert M. Chu - Essex Junction VT
Frank D. Ferraiolo - Essex Junction VT
John A. Fifield - Underhill VT
Teresa Thi Nguyen - Santa Clara CA
Michael Sofranko - Fort Collins CO

Assignee:

International Business Machines Corp. - Armonk NY

International Classification:

H03H 1126

US Classification:

327277

Abstract:

A variable digital delay line with an insertion delay as low as a single delay element yet capable of providing a large programmable delay with a small simple control mechanism. A loop connects an input to an output through selectable first delay elements such as 2:1 muxes and selectable second delay elements such as pairs of inverters by way of a plurality of intermediate nodes having a tap. A plurality of sneak paths are available wherein the loop by passes a remainder of first delay elements and/or second delay elements by way of the taps at the intermediate nodes.