Catherine M Chow

US Patent:

8121183, Feb 21, 2012

Filed:

Jul 13, 2007

Appl. No.:

11/777337

Inventors:

Lizhi Zhong - Sunnyvale CA, US
Ye Liu - San Jose CA, US
Catherine Yuk-fun Chow - San Jose CA, US
Ryan Jungsuk Park - San Jose CA, US
Freeman V. Zhong - San Ramon CA, US
Amaresh V. Malipatil - Milpitas CA, US

Assignee:

LSI Corporation - Milpitas CA

International Classification:

H03K 5/159

US Classification:

375230, 375233, 375229, 375234

Abstract:

A method for adaptive selection of floating taps in a decision feedback equalizer including the steps of (A) determining values for a predefined metric for tap positions within a range covered by a decision feedback equalizer (DFE) and (B) setting one or more floating taps of the DFE to tap positions based upon the values of the predefined metric.

US Patent:

20080070537, Mar 20, 2008

Filed:

Sep 5, 2006

Appl. No.:

11/516382

Inventors:

Cathy Ye Lin - San Jose CA, US
Freeman Zhong - San Ramon CA, US
Catherine Chow - San Jose CA, US
Yi Zeng - Fremont CA, US
Ryan Park - San Jose CA, US

International Classification:

H04B 7/00

US Classification:

455260

Abstract:

A method, apparatus and/or system of a duty cycle counting phase calibration scheme of an I/O interface is disclosed. In one embodiment a control unit of a communication system exchanging a multiple-phase time-interleaved data includes a first-PLL to generate a set of un-calibrated multiple-phase signals of a first-clock; a second-PLL, a pulse generator, a pulse-width measurement unit and a phase calibration engine to evaluate adjustments required in a temporal location of a logically critical voltage transition edge in each signal in the un-calibrated set; and a phase adjustment unit to adjust the temporal location of the logically critical voltage transition edge in each signal in the un-calibrated set to generate a set of calibrated multiple-phase signals of the first-clock such that each signal in the calibrated set includes the logically critical voltage transition edge which is time skewed in a predetermined amount from the logically critical voltage transition edge in other signals in the same set within a predetermined accuracy.