Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1995-05-26
1996-09-24
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 8, 331 14, 331 16, 331 23, 331 36C, 331177V, 332127, 327157, 327105, 455260, H03L 708, H03L 7093, H03L 7099, H03L 718
Patent
active
055594743
ABSTRACT:
In accordance with a loop open/close control signal, an analog switch closes or opens a loop including a voltage controlled oscillator, a variable frequency divider, a phase comparator, and a first loop filter, the analog switch, and a second loop filter. In order to reduce the change of frequency caused when the open loop state is set immediately after the output frequency is changed, the second loop filter uses a capacitor which shows properties of a small change of capacitance in response to an applied voltage and a small hysteresis. In another embodiment, the voltage controlled oscillator includes a second diode, one terminal of which is grounded, connected in reverses parallel to a first diode switch which switches the output oscillation frequency ranges of the voltage controlled oscillator.
REFERENCES:
patent: 4433308 (1984-02-01), Hirata
patent: 4510461 (1985-04-01), Dickes et al.
patent: 4980653 (1990-12-01), Shepherd
patent: 5053724 (1991-10-01), Ogino et al.
patent: 5095288 (1992-03-01), Dent
patent: 5302919 (1994-04-01), Abe
patent: 5334954 (1994-08-01), Koblitz et al.
patent: 5420545 (1995-05-01), Davis et al.
Adachi Hisashi
Kosugi Hiroaki
Matsumoto Takayuki
Sakakura Makoto
Matsushita Electric - Industrial Co., Ltd.
Mis David
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