Broadcom Corporation

Hsin-An Liu

Thomas J Kolze

Bruce Joseph Currivan

Jonathan S Min

Tak Kwan Lee

Loke Kun Tan

Fang Lu

Kevin Lee Miller

Thuji Simon Lin

Jeffrey Scott Putnam

Ravi Bhaskaran

Gopal Triplicane Venkatesan

James P Cavallo

All digital reference frequency locking. An all digital approach is provided for operation within one or more CMs within a cable modem communication system to lock the upstream of the one or more CMs to the downstream symbol clock provided from a CMTS. The locking of the CM's upstream may be performed using one of at least three different functions: (1) Locking the upstream symbol clock phase to the downstream symbol clock phase, (2) Locking the downstream symbol clock phase to the headend reference clock phase (typically 10.24 MHz or integer multiple thereof), and (3) Locking the upstream carrier frequency to the downstream symbol clock frequency. The all-digital techniques for supporting all digital reference frequency locking functionality provide high performance to support S-CDMA and other synchronous modulation techniques.

All digital reference frequency locking

Growing community of inventors

Irvine, CA, United States of America

Hsin-An Liu