Continuous time interpolator |
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| 申请号 | EP92307364.7 | 申请日 | 1992-08-12 | 公开(公告)号 | EP0529875A3 | 公开(公告)日 | 1993-12-01 |
| 申请人 | Hewlett-Packard Company; | 发明人 | Stephenson, Paul; | ||||
| 摘要 | A digital time interpolation system and method for quantizing the time-difference between two digital signals. The present invention measures the time-difference between consecutive zero crossings of a user signal and a reference oscillator (316). The present invention outputs interpolator data, which represents this time-difference in digital form. The present invention includes a quadrature hybrid (305), a synchronizer (304), track-and-holds (T&Hs) (306), analog-to-digital converters (ADC) (308), an encoding circuit (312), and a boundary detector (310). The present invention also includes a system for deskewing the recorded coarse time count and the fine time value. According to the present invention, the reference oscillator (316) is a continuous, two-phase signal having a unique pair of output values at any given instant of its period. By using this reference oscillator (316), the present invention accelerates conversion. The present invention uses a novel boundary detection scheme. By using this boundary detection scheme, the present invention avoids the timing errors which are traditionally introduced by measuring synchronizer outputs directly. | ||||||
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| 说明书全文 | |||||||
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