Invention Grant
- Patent Title: High-speed programmable frequency divider with 50% output duty cycle
- Patent Title (中): 高速可编程分频器,占空比为50%
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Application No.: US14839817Application Date: 2015-08-28
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Publication No.: US09590637B1Publication Date: 2017-03-07
- Inventor: Pak-Kim Lau , Min Chu
- Applicant: Integrated Device Technology, Inc.
- Applicant Address: US CA San Jose
- Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.
- Current Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.
- Current Assignee Address: US CA San Jose
- Agency: Glass & Associates
- Agent Kenneth Glass
- Main IPC: H03K21/00
- IPC: H03K21/00 ; H03K23/40 ; H03K23/66 ; H03K21/10

Abstract:
A frequency divider includes a multiplexer having a first input terminal coupled to receive a first value M and a second input terminal for receiving a second value that is M+LSB, the multiplexer is configured to alternately output the first value M and the second value. The frequency divider includes a multi-modulus divider coupled to the multiplexer for receiving the output of the multiplexer, the multi-modulus divider operable to alternately generate an output pulse at M input clock cycles and at M+LSB clock cycles. A divide-by-two counter having an input coupled to the output of the multi-modulus divider, is operable to divide the output of the multi-modulus divider to generate a divided clock signal having a frequency of N, where N is equal to 2M+LSB. Duty cycle correction logic is coupled to the output of the divide-by-two counter and is configured to correct the duty cycle of the divided clock signal to a fifty percent duty cycle when N is odd.
Public/Granted literature
- US1235190A Shock-absorbing spring. Public/Granted day:1917-07-31
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