发明公开
EP1255355A1 System and method for time dithering a digitally-controlled oscillator tuning input
审中-公开
系统和方法，用于产生一个抖动信号到数字控制振荡器的调谐输入
- 专利标题： System and method for time dithering a digitally-controlled oscillator tuning input
- 专利标题（中）： 系统和方法，用于产生一个抖动信号到数字控制振荡器的调谐输入
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申请号： EP01000127.9申请日： 2001-04-26
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公开(公告)号： EP1255355A1公开(公告)日： 2002-11-06
- 发明人: Staszewski, Robert B. , Maggio, Kenneth , Leipold, Dirk
- 申请人： Texas Instruments Incorporated
- 申请人地址： 7839 Churchill Way, Mail Station 3999 Dallas, Texas 75251 US
- 专利权人： Texas Instruments Incorporated
- 当前专利权人： Texas Instruments Incorporated
- 当前专利权人地址： 7839 Churchill Way, Mail Station 3999 Dallas, Texas 75251 US
- 代理机构： Holt, Michael
- 主分类号： H03L7/099
- IPC分类号： H03L7/099 ; H03L7/093 ; H03B1/04
摘要：
A technique of time dithering a fully digitally-controlled oscillator (DCO) tuning input employs a shift register 1306 and a multiplexer 1308 responsive to a sigma-delta modulated delay control to minimize spurious tones generated by a DCO 200. The shift register 1306 is clocked via a divided-down high-frequency reference provided by the DCO 200 output signal. The multiplexer 1308 is clocked via a frequency reference that is reclocked and synchronized to the DCO 200 output signal. The multiplexer 1308 output is thus time dithered in response to a delay control to minimize perturbations caused by switching.
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