Numerically controlled oscillator circuit

Details Numerically controlled oscillator circuit Numerically controlled oscillator circuit

1997-09-16

1999-05-18

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 25, H03L7/06

Patent

active

059054115

ABSTRACT:
A numerically controlled oscillator including an RTS value producing circuit which produces a series of residual time stamp (RTS) values indicative of a relation between the setting value and an actual oscillation frequency. A pulse train generator generates a pulse train in a period corresponding to the produced series of RTS values and a phase synchronous oscillator oscillates at a frequency in synchronism with the pulse train output from the pulse train generator. Preferably, the pulse train generated by the pulse train generator is supplied to the RTS value producing circuit as a signal indicative of the actual oscillation frequency.

REFERENCES:
patent: 5517534 (1996-05-01), Knierim
patent: 5656976 (1997-08-01), Jung et al.
K. Murakami, "Jitter in Synchronous Residual Time Stamp", IEEE Transactions on Communication, vol. 44, No. 6, Jun. 1996, pp. 742-748.
R.C. Lau, et al., "Synchronous Techniques for Timing Recovery in BISDN", IEEE Transactions on Communication, vol. 43, No. 2/3/4, Feb./Mar./Apr. 1995, pp. 1810-1818.

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