Frequency synthesizer having DDS in place of VCO

Details Frequency synthesizer having DDS in place of VCO Frequency synthesizer having DDS in place of VCO

1994-11-04

1996-07-23

Grimm, Siegfried H.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327159, 331 17, 331 25, 331 34, H03L 7099, H03L 716

Patent

active

055393462

ABSTRACT:
A frequency synthesizer is able not only to keep a high frequency stability and follow a frequency of a reference signal that is set to cover or varies over a broad range, but also to provide stable phase-locked loop characteristics without a variable frequency oscillator being employed. In the frequency synthesizer, a phase-locked loop comprises phase comparator 1 for detecting a phase difference between reference signal A and comparison signal B to output phase error information; loop filter 2 for generating loop control information D in accordance with the phase error information C; and DDS 22 which generates the comparison signal B in accordance with the loop control information D which is a phase incremental value to take a required frequency out of waveform data corresponding to a phase by employing a clock signal from clock oscillator 32. Thus, synchronizing signal I which follows reference signal A, a frequency of which is set to cover or varies over a broad range can be obtained.

REFERENCES:
patent: 3973209 (1976-08-01), Nossen et al.
patent: 4151473 (1979-04-01), Coleman et al.
patent: 4577163 (1986-03-01), Culp
patent: 4965533 (1990-10-01), Gilmore
patent: 5184092 (1993-02-01), Shahriary et al.
Stephen M. Walters et al., "Digital Phase-Locked Loop with Jitter Bounded", IEEE Transactions On Circuits And Systems, vol. 36, No. 7, Jul. 1989, N.Y., U.S., pp. 980-987, XP54027.

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