Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2005-07-20
2009-02-24
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
Reexamination Certificate
active
07496161
ABSTRACT:
In one embodiment, a communication receiver includes an adaptive filter, a clock and data recovery (CDR) unit, and an adaptation control unit. The adaptive filter equalizes an input signal received over a communication channel to generate a compensated signal. The CDR unit processes the compensated signal to generate a sampling clock signal, a data signal, and a transition signal, the transition signal comprising samples of the compensated signal taken at an edge of the sampling clock signal, the data signal comprising data recovered from the input signal. The adaptation control unit receives the sampling clock signal, data signal, and transition signal and uses them to generate a control signal. The control signal may be used to control a gain of an amplifier in the adaptive filter to equalize the input signal. The adaptive filter, CDR unit, and adaptation control unit may be implemented using electrical circuits disclosed herein.
REFERENCES:
patent: 5103466 (1992-04-01), Bazes
patent: 5991339 (1999-11-01), Bazes et al.
patent: 6088415 (2000-07-01), Gaudet
patent: 6411145 (2002-06-01), Kueng et al.
patent: 2005/0078780 (2005-04-01), Chou et al.
Chou Gerchih
Lin Chia-Liang
Ahn Sam K
Okamoto & Benedicto LLP
Realtek Semiconductor Corporation
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