Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Reexamination Certificate
2005-04-12
2005-04-12
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
C331S008000, C331S017000, C331S03600C, C331S17700V, C332S124000, C332S127000
Reexamination Certificate
active
06879218
ABSTRACT:
A correction circuit for a voltage-controlled oscillator (VCO) is arranged outwardly of the voltage-controlled oscillator. The oscillation of the selected frequency and the frequency modulation are carried out independently of each other. The correction circuit includes a frequency selection controller generating a frequency selection signal of the DC potential, and a frequency modulation controller generating a modulation adjusting signal responsive to the input of a modulating signal. When a frequency modulation control signal, including the DC potential of the frequency selection signal and the modulation adjusting signal, is supplied to the voltage-controlled oscillator, the capacitance is lowered even if the frequency is increased, thus allowing the modulation degree to frequency to be decreased to a substantially constant level.
REFERENCES:
patent: 4378534 (1983-03-01), Goedken et al.
patent: 2001-196860 (2001-07-01), None
Mis David
Oki Electric Industry Co. Ltd.
Rabin & Berdo P.C.
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