Texas Instruments Corporation

Tripath Technology, Inc.

Kar Shing Chiu

Adya S Tripathi

Delon Hanson

Raman Dakshinamurthy

Ki Chun Fu

Ming-Tak Leung

Ming-Tak Leving

According to the present invention, methods and apparatus are provided for improving the signal quality of received transmission. An adaptive equalizer includes multiple output delay lines. One output delay line is configured to provide gradient elements. Another output delay line is configured with coefficient multipliers calculated using the gradient elements. The coefficient multipliers are used to alter a received signal to more closely correspond to an expected signal. The adaptive equalizer can be used in systems such as optical transceivers.

Methods and apparatus for adaptive equalization

A read clock interface includes a serial-to-parallel converter for receiving two interleaved serial data streams read out from a disk and converting the serial data to 17-bit parallel data, and a state machine for receiving a clock signal having a frequency one-half that of a frequency at which the serial data is read out from the disk and frequency dividing the clock signal to generate a conversion clock signal consisting of alternating conversion cycles each having an even number of cycles of the clock signal, wherein the serial-to-parallel converter converts the serial data to parallel data at each conversion cycle of the conversion signal. In the preferred embodiment, the conversion signal consists of alternating conversion cycles of 16 and 18 cycles of the clock signal.

Read clock interface for read channel device

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Sunnyvale, CA, United States of America

Kar Shing Chiu