Invention Grant
- Patent Title: Clock and data recovery circuit and communications apparatus including the clock and data recovery circuit
- Patent Title (中): 时钟和数据恢复电路和通信设备包括时钟和数据恢复电路
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Application No.: US12048020Application Date: 2008-03-13
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Publication No.: US07889816B2Publication Date: 2011-02-15
- Inventor: Isamu Moriwaki
- Applicant: Isamu Moriwaki
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Dickstein Shapiro LLP
- Priority: JP2007-068516 20070316
- Main IPC: H04L27/00
- IPC: H04L27/00 ; H04L7/00 ; H03D3/18

Abstract:
A clock and data recovery circuit that includes a unit to output N-phase clocks each of which has a phase shifted from the others by a time T2 obtained by dividing a clock period P1 by N, a unit to obtain sampling data serially transferred every time T2, a unit to convert the sampling data into first N-bit parallel data every period P1, a unit to convert the first N-bit parallel data into second N-bit parallel data indicating a change point in the sampling data, and a unit to use the second N-bit parallel data as input of phase information and output third N-bit parallel data indicating substantially a center position of the change point. N is an integer greater than 2 and data of the first N-bit parallel data at a position equal to the position indicated by the third N-bit parallel data is determined to be recovered data.
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