Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2007-12-31
2011-10-18
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S345000, C375S371000
Reexamination Certificate
active
08040984
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.
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Aziz Pervez M.
Healey Adam B.
Mobin Mohammad S.
Schiessler Gary E.
Sheets Gregory W.
Agere System Inc.
Bocure Tesfaldet
Ryan & Mason & Lewis, LLP
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