Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Patent
1995-12-22
1997-07-15
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
331 14, 331 16, 331 17, 331 25, 331 36C, 331177V, 331179, H03L 7099, H03L 710
Patent
active
056487444
ABSTRACT:
A system and method for establishing the frequency of a voltage controlled oscillator ("VCO") within narrowly defined frequency bands. The resonant circuit of the VCO uses selectable elements, such as varactor diodes, to establish the operating frequency band. The control voltage of the VCO is varied within a voltage range to adjust the VCO output frequency. A phase detector compares the VCO output to a reference signal. If the phase detector determines that there is an imbalance between the VCO output and the reference signal, then it produces a signal which indicates whether the VCO frequency should be increased or decreased to match the reference signal frequency. If the control voltage is outside of the voltage range, then the system allows the operating frequency band to be changed by varying the number of selectable elements in response to the phase detector signal.
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Prakash Jaideep
Rotzoll Robert Rudolf
Grimm Siegfried H.
Microtune, Inc.
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