发明授权
- 专利标题: Method to program the starting phase of the spread spectrum
- 专利标题(中): 编程扩频开始阶段的方法
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申请号: US12054328申请日: 2008-03-24
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公开(公告)号: US08218598B1公开(公告)日: 2012-07-10
- 发明人: Gabriel Li
- 申请人: Gabriel Li
- 申请人地址: US CA San Jose
- 专利权人: Cypress Semiconductor Corporation
- 当前专利权人: Cypress Semiconductor Corporation
- 当前专利权人地址: US CA San Jose
- 主分类号: H04B1/00
- IPC分类号: H04B1/00
摘要:
Disclosed is a circuit and method to program the starting phase of the spread spectrum of a clock output. The circuit includes a plurality of phase locked loop (PLL) circuits for generating a plurality of spread spectrum waveforms. The circuit also includes a spread control circuit for controlling each of the plurality of PLL circuits in accordance with a plurality of respective spread profiles. The spread profiles are configured to vary a starting phase of each spread spectrum waveform such that a total energy of each spread spectrum waveform is out of phase with other spread spectrum waveforms.
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