Invention Grant
- Patent Title: Clock divide-by-three circuit
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Application No.: US15989619Application Date: 2018-05-25
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Publication No.: US10379570B1Publication Date: 2019-08-13
- Inventor: Conrado K. Mesadri , Bob W. Verbruggen
- Applicant: Xilinx, Inc.
- Applicant Address: US CA San Jose
- Assignee: XILINX, INC.
- Current Assignee: XILINX, INC.
- Current Assignee Address: US CA San Jose
- Agent William T. Paradice; Yipeng Li
- Main IPC: H03B19/00
- IPC: H03B19/00 ; G06F1/08 ; H03K5/15 ; G06F1/10

Abstract:
A clock divider circuit receives an input clock signal having a first frequency (f) and generates an output signal having a frequency equal to f/N, where N is an odd integer. The clock divider circuit includes an edge counter to count a number of consecutive edges of the input clock signal having a first plurality, and to assert a control signal when a threshold number (N) of consecutive edges has been counted. The clock divider circuit also includes a frequency multiplier to generate an intermediate clock signal having a frequency equal to 2f/N by doubling the frequency of the control signal based at least in part on transitions of the input clock signal, and a frequency divider to generate an output clock signal having a frequency equal to f/N by halving the frequency of the intermediate clock signal.
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