Methods and apparatus for improved jitter tolerance in an SFP limit amplified signal
摘要
<p>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.</p>
申请公布号
EP2075930(A1)
申请公布日期
2009.07.01
申请号
EP20080173111
申请日期
2008.12.30
申请人
AGERE SYSTEMS, INC.
发明人
AZIZ, PERVEZ M.;HEALEY, ADAM B.;MOBIN, MOHAMMAD S.;SCHIESSLER, GARY E.;SHEETSS, GREGORY W.;SMITH, LANE A.;TRACY, PAUL H.;ZHANG, GEOFFREY