Invention Grant
- Patent Title: Techniques for generating fractional periodic signals
- Patent Title (中): 产生分数周期信号的技术
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Application No.: US13969427Application Date: 2013-08-16
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Publication No.: US08995599B1Publication Date: 2015-03-31
- Inventor: Tien Duc Pham , Leon Zheng , Sergey Shumarayev , Zhi Y. Wong , Paul B. Ekas
- Applicant: Altera Corporation
- Applicant Address: US CA San Jose
- Assignee: Altera Corporation
- Current Assignee: Altera Corporation
- Current Assignee Address: US CA San Jose
- Agent Steven J. Cahill
- Main IPC: H03D3/24
- IPC: H03D3/24 ; H03L7/08

Abstract:
A phase-locked loop circuit includes phase detection circuitry to generate a first control signal based on a phase comparison between first and second periodic signals. An oscillator circuit causes a frequency of a third periodic signal to vary based on the first control signal. A frequency divider circuit divides the frequency of the third periodic signal by a frequency division value to generate a frequency of the second periodic signal. A delta sigma modulator circuit controls the frequency division value based on second control signals. First storage circuits store the second control signals based on third control signals in response to a fourth periodic signal. A second storage circuit stores an output signal based on a fourth control signal. The fourth periodic signal is generated based on the output signal of the second storage circuit.
Information query
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