Signal adjustment receiver circuitry

Pulse or digital communications – Receivers

Reexamination Certificate

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Details

C375S229000, C375S230000, C375S231000, C375S232000, C375S233000

Reexamination Certificate

active

07733982

ABSTRACT:
Systems and methods for adjusting a signal received from a communication path are disclosed. A receiver can receive a signal from a communication path which attenuates at least some frequency components of the signal. The receiver can include an equalization block that adjusts at least some of the frequency content of the received signal, a signal normalization block that provides a normalized signal amplitude and/or a normalized edge slope, and a control block. In one embodiment, the control block controls frequency adjustment in the equalization block for high frequencies but not for low frequencies. For low frequency adjustment, the control block controls the normalized signal amplitude in the signal normalization block. In this manner, controlled adjustment for low frequency content is performed in the signal normalization block.

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Jong-Sang Choi et al., “A 0.18-μm CMOS 3.5-Gb/s Continuous-Time Adaptive Cable Equalizer Using Enhanced Low-Frequency Gain Control method”, IEEE Journal of Solid-State Circuits, vol. 39, No. 3, pp. 419-425 (2004).
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Office Action dated Jan. 7, 2010 for Japanese Application No. 2006-318128.

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