Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1975-11-12
1977-01-04
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331 19, 331 25, 331 44, H03B 304
Patent
active
040017141
ABSTRACT:
A search and confirm frequency synthesizer for generating an output frequency which is a multiple of a predetermined reference frequency is disclosed. A first means is provided for generating a reference frequency signal. A second means is provided for generating a comparison frequency signal. A first spectrum generator means is coupled to the first means and produces a plurality of harmonics of the reference frequency signal. A second spectrum generator means is coupled to the second means and produces a plurality of harmonics of the comparison frequency signal. Means including a phase-locked loop and feedback and control circuitry is operatively coupled to the first and second spectrum generator means for controlling the operation of the phase-locked loop to produce an output signal having a frequency equal to a selected harmonic of the reference frequency signal. As a further feature of the disclosed apparatus the first means for generating a reference signal and the second means for generating a comparison frequency signal can be crystal oscillators.
REFERENCES:
patent: 3676794 (1972-07-01), Bidell et al.
patent: 3694766 (1972-09-01), Boelke
patent: 3848199 (1974-11-01), Weber
patent: 3904980 (1975-09-01), Hugenholtz
patent: 3916334 (1975-10-01), Hugenholtz
Grimm Siegfried H.
Motorola Inc.
Parsons Eugene A.
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