发明公开
EP0874449A2 A method and apparatus for phase detection in digital signals
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Verfahren undGerätzum Phasendetektieren在digitale Signalen
- 专利标题： A method and apparatus for phase detection in digital signals
- 专利标题（中）： Verfahren undGerätzum Phasendetektieren在digitale Signalen
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申请号： EP98303144.4申请日： 1998-04-23
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公开(公告)号： EP0874449A2公开(公告)日： 1998-10-28
- 发明人: Spagnoletti, Robert William , Sparks, Adrian Paul , Foster, Stephen Richard
- 申请人： NORTHERN TELECOM LIMITED
- 申请人地址： World Trade Center of Montreal, 380 St. Antoine Street West, 8th Floor Montreal, Quebec H2Y 3Y4 CA
- 专利权人： NORTHERN TELECOM LIMITED
- 当前专利权人： NORTHERN TELECOM LIMITED
- 当前专利权人地址： World Trade Center of Montreal, 380 St. Antoine Street West, 8th Floor Montreal, Quebec H2Y 3Y4 CA
- 代理机构： Humphrey-Evans, Edward John
- 优先权： US847426 19970424; US847424 19970424; US840000 19970424
- 主分类号： H03D13/00
- IPC分类号： H03D13/00
摘要：
The invention seeks to provide an improved method and apparatus for detecting the phase difference between a digital data signal and a clock signal. By ensuring that no pulse in the output phase signal is narrow enough to introduce a non-linearity, the present invention avoids a source of non-linearity exhibited in existing phase detectors.
In addition, by ensuring that critical timing paths through the circuit contain similar circuit blocks, with similar propagation delays, relative time relationships are preserved from clock and data inputs to XOR inputs. The circuit is therefore largely insensitive to changes in the characteristics of the components so long as they all move together, as they would in an integrated circuit implementation.
The present invention also seeks to provide an improved digital signal threshold detector and a digital signal regenerator based on said apparatus.
In addition, by ensuring that critical timing paths through the circuit contain similar circuit blocks, with similar propagation delays, relative time relationships are preserved from clock and data inputs to XOR inputs. The circuit is therefore largely insensitive to changes in the characteristics of the components so long as they all move together, as they would in an integrated circuit implementation.
The present invention also seeks to provide an improved digital signal threshold detector and a digital signal regenerator based on said apparatus.
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