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1. (WO2013119209) GATED RING OSCILLATOR-BASED DIGITAL EYE WIDTH MONITOR FOR HIGH-SPEED I/O EYE WIDTH MEASUREMENT

Pub. No.:    WO/2013/119209    International Application No.:    PCT/US2012/024132
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Wed Feb 08 00:59:59 CET 2012
IPC: H03K 5/19
G01R 29/02
H04L 27/156
Applicants: INTEL CORPORATION
WEI, Fangxing
MANDAL, Subratakumar
Inventors: WEI, Fangxing
MANDAL, Subratakumar
Title: GATED RING OSCILLATOR-BASED DIGITAL EYE WIDTH MONITOR FOR HIGH-SPEED I/O EYE WIDTH MEASUREMENT
Abstract:
A novel digital eye width monitor (DEWM) system and method are disclosed. The DEWM system provides on-die capability to directly measure the left and right eye-width in picoseconds. The DEWM system measures the time from the phase interpolator (PI) clock position (data eye center, left edge, right edge) to a reference clock, and calculates the left and right eye width within a single-digit pico-second level of accuracy.