Invention Grant
- Patent Title: Digital second-order CDR circuits
- Patent Title (中): 数字二阶CDR电路
-
Application No.: US13679123Application Date: 2012-11-16
-
Publication No.: US08995597B2Publication Date: 2015-03-31
- Inventor: Chin-Ming Fu , Tsung-Hsin Yu , Chi-Chang Lu , Wei Chih Chen
- Applicant: Taiwan Semiconductor Manufacturing Company, Ltd.
- Applicant Address: TW Hsin-Chu
- Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
- Current Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
- Current Assignee Address: TW Hsin-Chu
- Agency: Slater & Matsil, L.L.P.
- Main IPC: H04L7/00
- IPC: H04L7/00 ; H04L7/033

Abstract:
A method for performing a clock and data recovery includes providing data and a clock; determining early/late values of the data to generate a first-order phase code using the data and the clock; and accumulating first-order phase codes retrieved from different finite state machine (FSM) cycles to generate a second-order phase code. A plurality of candidate total phase codes is generated from the second-order phase code. A multiplexing is performed to the plurality of candidate total phase codes to output one of the plurality of candidate total phase codes as a total phase code. The multiplexing is controlled by the first-order phase code. A brake machine may be implemented to prevent over-compensation of phases.
Public/Granted literature
- US20140140458A1 Digital Second-Order CDR Circuits Public/Granted day:2014-05-22
Information query