Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1995-06-07
1996-11-26
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 25, 377 48, H03K 2366, H03K 2368, H03L 7197
Patent
active
055789684
ABSTRACT:
A frequency synthesizer includes a phase detector for comparing a reference frequency with a feedback frequency, a filter connected to the phase detector for permitting the passage of low frequency therethrough, a voltage controlled oscillator connected to the filter, a multistage frequency converter for receiving the oscillator signal from the voltage controlled oscillator as an input, and a divider for dividing the output of the multistage frequency converter to form the feedback frequency. The multistage frequency converter includes a plurality of frequency converters connected in series or parallel to each other, each of the frequency converters being adapted to perform a non-integer division. The division ratio can be set arbitrarily and finely. Thus, the feedback frequency inputted to the phase detector can be maintained constant and yet higher, irrespectively of the output frequency of the frequency synthesizer. Therefore, the reference frequency can be also maintained higher as is the feedback frequency, irrespectively of the frequency interval in the output frequency of the voltage controlled oscillator. This enables the acquisition time to be greatly reduced.
REFERENCES:
patent: 3605025 (1971-09-01), Lincoln et al.
patent: 3808347 (1974-04-01), Gehrig
patent: 3872397 (1975-03-01), Hanneman
patent: 3928813 (1975-12-01), Kingsford-Smith
patent: 4573176 (1986-02-01), Yeager
Duk-Kyu Park and Shinsaku Mori, "Fast Acquisition Frequency Synthesizer with N-Stage Novel Type Cycle Swallowers," IEEE Communications Society, Conference Proceedings of IEEE International Conference on Communicaitons, Jun. 14-18, 1992, Chicago, IL., pp. 319.6.1-319.6.5.
Miyagi Hiroshi
Mori Shinsaku
Park Duk-Kyu
Grimm Siegfried H.
Mori Shinsaku
Park Duk-Kyu
Shintom Co., Ltd.
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