Pulse or digital communications – Equalizers
Reexamination Certificate
2011-01-11
2011-01-11
Ha, Dac V (Department: 2611)
Pulse or digital communications
Equalizers
C375S233000, C375S348000, C455S043000, C455S501000, C455S307000
Reexamination Certificate
active
07869494
ABSTRACT:
One or more embodiments of the invention comprise a continuous-time equalizer (CTE) for reducing both pre-cursor and post-cursor intersymbol interference (ISI) from data received from a communication channel. One such equalizer comprises two independent stages that process the input signal in parallel. One stage subtracts a scaled version of the derivative of the input signal from a scaled version of the input signal to reduce pre-cursor ISI from the input signal. The other stage adds a scaled version of the derivative of the input signal to a scaled version of the input signal to reduce post-cursor ISI from the input signal. The outputs from the two stages are then multiplied to arrive at an output signal in which both pre- and post-cursor ISI is minimized. Because the scalars used in each of the stages are independent, each can be adjusted for greater manipulation of the ISI-reduced signal.
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J.E.C. Brown et al., “A CMOS adaptive continuous-time forward equalizer, LPF, and RAM-DFE for magnetic recording,” IEEE J. Solid-State Circuits, vol. 34, no. 2, pp. 162-169 (Feb. 1999).
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Ha Dac V
Micro)n Technology, Inc.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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