发明授权
- 专利标题: Frequency division network having low phase noise
- 专利标题(中): 分频网络具有低相位噪声
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申请号: US612485申请日: 1990-11-14
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公开(公告)号: US5091699A公开(公告)日: 1992-02-25
- 发明人: Bert K. Erickson , Robert R. Greenwood , Wilbert C. Kennedy , David W. Michel , David C. Allen , Victor J. Jacek
- 申请人: Bert K. Erickson , Robert R. Greenwood , Wilbert C. Kennedy , David W. Michel , David C. Allen , Victor J. Jacek
- 申请人地址: NY Syracuse
- 专利权人: General Electric Company
- 当前专利权人: General Electric Company
- 当前专利权人地址: NY Syracuse
- 主分类号: H03B19/00
- IPC分类号: H03B19/00
摘要:
A frequency division network is disclosed in which a sinusoidal signal is converted to a digital format for frequency division and then converted back to the sinusoidal format, the sinusoidal output waveform having low phase noise. In a preferred embodiment the frequency conversion takes place in an m-fold plurality of edge triggered flip-flops, connected to divide by two, and clocked by the sinusoidal waveform. Each flip-flop is subject to jitter causing phase noise, which is minimized when the output of two sets of four flip-flops are averaged, and then filtered to obtain the sinusoidal fundamental. When a crystal filter having a very narrow pass band is employed, the phase noise is further reduced. The frequency division network uses low cost components and the phase noise of the output waveform approaches that of a stable crystal oscillator.
公开/授权文献
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