Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1999-05-05
2000-08-22
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
327 7, 327 9, 327 12, 331 1A, 331 25, G01R 2500, H03D 1300, H03L 7091
Patent
active
061078905
ABSTRACT:
The phase of a pulsed test signal is measured with reference to a reference signal of constant frequency by sampling the test signal at times determined by transitions in the reference signal and comparing the sampled test signal with the output of a phase accumulator clocked by the reference signal. A resulting measurement signal represents a difference in the number of transitions occurring in the sampled test signal and a reference state signal output by the phase accumulator. The measurement signal may be averaged and integrated to obtain an error signal which may then be filtered to provide a control signal for an oscillator. A digital frequency synthesizer is provided by frequency dividing the output of the oscillator by a constant multiple to obtain the test signal and integrating an offset signal in addition to the averaged measurement signal so that the operating frequency of the oscillator is offset from a nominal frequency by an amount determined by the offset signal. The digital frequency synthesizer is suitable for use in a synchronous equipment timing source within a telecommunications multiplexer operating at a line transmission rate of 155.52 MHz.
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patent: 5781044 (1998-07-01), Riley et al.
patent: 5818304 (1998-10-01), Hogeboom
V. Reinhardt et al, "A Short Survey of Frequency Synthesizer Techniques" 40th Annual Frequency Control Symposium--1986, pp. 335 to 365 IEEE.
Brown Andrew
Carson Mark Brian
Grimm Siegfried H.
Nortel Networks Corporation
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