Paul Dobson Tracy

US Patent:

8315298, Nov 20, 2012

Filed:

Oct 31, 2007

Appl. No.:

11/930780

Inventors:

Pervez M Aziz - Dallas TX, US
Mohammad S Mobin - Orefield PA, US
Gregory W Sheets - Breinigsville PA, US
Lane A Smith - Easton PA, US
Paul H. Tracy - Schnecksville PA, US

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H03H 7/30

US Classification:

375232

Abstract:

Methods and apparatus are provided for equalizing a received signal. A received signal is equalized by determining a data rate of the received signal; obtaining one or more equalization parameters associated with the determined data rate; and equalizing the received signal using the obtained one or more equalization parameters. The equalization parameters may comprise, for example, one or more of a gain parameter, zero control for a high pass filter and one or more threshold settings for one or more latches used during the equalizing step, such as data latches or transition latches (or both).

US Patent:

8432959, Apr 30, 2013

Filed:

Oct 31, 2007

Appl. No.:

11/930814

Inventors:

Pervez M. Aziz - Dallas TX, US
Mohammad S. Mobin - Orefield PA, US
Gregory W Sheets - Breinigsville PA, US
Lane A. Smith - Easton PA, US
Paul H. Tracy - Schnecksville PA, US

Assignee:

Agere Systems LLC - Allentown PA

International Classification:

H03H 7/30
H03K 5/159

US Classification:

375232, 375230, 375231

Abstract:

Methods and apparatus are provided for equalizing a received signal. A received signal is equalized by updating one or more equalization parameters; and discarding the updated equalization parameters if one or more predefined qualifier conditions are detected during the equalizing step. The received signal can optionally be equalized using the updated equalization parameters if the predefined qualifier conditions are not detected during the equalizing step. The updated equalization parameters can optionally be stored if the one or more predefined qualifier conditions are not detected during the equalizing step.

US Patent:

20090168940, Jul 2, 2009

Filed:

Dec 31, 2007

Appl. No.:

11/967602

Inventors:

Pervez M. Aziz - Dallas TX, US
Adam B. Healey - Newburyport MA, US
Mohammad S. Mobin - Orefield PA, US
Gary E. Schiessler - Allentown PA, US
Gregory W. Sheets - Breinigsville PA, US
Lane A. Smith - Easton PA, US
Paul H. Tracy - Schnecksville PA, US
Geoffrey Zhang - Allentown PA, US

International Classification:

H04L 7/00

US Classification:

375371

Abstract:

Methods and apparatus are provided for improving the jitter tolerance in an SFP limit amplified signal. Jitter tolerance is improved in a communications receiver by applying a received signal to an SFP limiting amplifier; and applying an output of the SFP limiting amplifier to a low pass filter to improve the jitter tolerance. The low pass filter optionally applies a programmable amount of attenuation to high frequency components of the output. The low pass filter slew rate controls (i.e., rotates) a data eye representation of the received signal to increase the data eye representation along a time axis. The noise margin of the received signal can optionally be improved by applying an output of the low pass filter to an all pass filter. A slew rate controller can evaluate the data eye statistics to determine a setting for the low pass filter.