Coded data generation or conversion – Phase or time of phase change
Patent
1991-08-29
1993-03-02
Pellinen, A. D.
Coded data generation or conversion
Phase or time of phase change
341113, H03M 164
Patent
active
051913364
ABSTRACT:
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. The present invention outputs interpolator data, which represents this time-difference in digital form. The present invention includes a quadrature hybrid, a synchronizer, track-and-holds (T&Hs), analog-to-digital converters (ADC), an encoding circuit, and a boundary detector. 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 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, 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.
REFERENCES:
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C. Legrele and J. C. Lugol, "A One Nanosecond Resolution Time-to-Digital Converter," IEEE Transactions on Nuclear Science, vol. NS-30, No. 1, Feb. 1983, pp. 297-300.
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Juha Kostamovaara and Risto Myllyla, "Time-to-Digital Converter with an Analog Interpolation Circuit," Rev. Sci. Instrum. 57(11), Nov. 1986, pp. 2880-2885.
Paul S. Stephenson, "Frequency and Time Interval Analyzer Measurement Hardware," Hewlett-Packard Journal, Feb. 1989, pp. 35-41.
Hewlett--Packard Company
Pellinen A. D.
Young B. K.
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