US 6,982,604 B2
CDR lock detector with hysteresis
David Kyong-sik Chung, Newport Beach, Calif. (US)
Assigned to Broadcom Corporation, Irvine, Calif. (US)
Filed on Nov. 02, 2004, as Appl. No. 10/979,925.
Application 10/979925 is a continuation of application No. 10/829755, filed on Apr. 22, 2004, granted, now 6,833,763.
Application 10/829755 is a continuation of application No. 10/335190, filed on Dec. 30, 2002, granted, now 6,747,518, filed on Jun. 08, 2004.
Prior Publication US 2005/0062546 A1, Mar. 24, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. H03L 7/095 (2006.01)
U.S. Cl. 331—1A 12 Claims
OG exemplary drawing
 
1. A lock-detect method comprising:
generating a user-configurable signal for selecting between a first mode of operating a lock-detect circuit and a second mode of operating the circuit;
generating a first pulse and a second pulse based on the selected mode of operating the circuit;
determining whether an input signal is in-lock with a reference signal based on the first pulse; and
determining whether the input signal is out-of-lock with the reference signal based on the second pulse.