Invention Grant
- Patent Title: System and method for multiple-phase clock generation
- Patent Title (中): 用于多相时钟生成的系统和方法
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Application No.: US11616742Application Date: 2006-12-27
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Publication No.: US07642865B2Publication Date: 2010-01-05
- Inventor: Tanmoy Sen , Anand Kumar , Deependra Kumar Jain
- Applicant: Tanmoy Sen , Anand Kumar , Deependra Kumar Jain
- Applicant Address: IN Greater Noida, UP
- Assignee: STMicroelectronics Pvt. Ltd.
- Current Assignee: STMicroelectronics Pvt. Ltd.
- Current Assignee Address: IN Greater Noida, UP
- Agency: Hogan & Hartson LLP
- Priority: IN3550/DEL/2005 20051230
- Main IPC: H03B27/00
- IPC: H03B27/00

Abstract:
A multiple phase clock circuit includes a multiple stage voltage controlled oscillator (VCO) and multiple clock dividers. The VCO is operative at a frequency ‘N’ times higher than the required output frequency and generates ‘M’ equally spaced outputs having different phases but same frequency which are sent to multiple clock dividers. A modified Johnson counter is used as a clock divider. Each counter divides the frequency of the clock signal by N. As a result, each of the M outputs of the VCO are divided into N outputs, thereby making a total of ‘M×N’ equally spaced outputs. These output clock pulses have same frequency but different phases. A sequential logic is provided within the device for enabling the Johnson counters as soon as the VCO starts giving output, thus maintaining the sequence of the output of the Johnson counters.
Public/Granted literature
- US20070200641A1 SYSTEM AND METHOD FOR MULTIPLE-PHASE CLOCK GENERATION Public/Granted day:2007-08-30
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