Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1977-06-30
1979-01-30
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331 19, 331 22, 331 25, 331 31, H03B 308
Patent
active
041375084
ABSTRACT:
A comparator-discriminator is provided, suitable for use with a phaselock control system of a frequency synthesizer, to permit automatic tuning of a variable oscillator to a selected frequency lying within a frequency band for which a phaselock may occur. This system permits the frequency of the variable oscillator to lock-on to an arbitrary value in the range other than the preselected value, at which time the phaselock is broken by an injected signal, thereby permitting the shifting of the oscillator frequency to a value lying closer to the selected frequency value. Upon achievement of phaselock to the selected frequency, in a slightly more elaborate embodiment, the injected signal is inhibited and no further breaking of phaselock can occur. In operation of both the embodiments the comparator-discriminator provides a control signal in the sense of driving the variable oscillator towards the preselected value, using a periodically actuated switch to connect the control signal to the oscillator control system. The two embodiments disclosed have the virtues of simplicity, low cost and enhanced reliability as well as a short channel selection time. A further embodiment of the system relates to a synthesizer with spectrum shift interpolation. In two further embodiments of the same system simplifications are described in which arrangements some functions of the channel selection and interpolation are combined. One of these embodiments employs a phaselock oscillator as the basic frequency source for the channel selection system while the second embodiment employs a system of mixing and filtering.
REFERENCES:
patent: 3904980 (1975-09-01), Hugenholtz
patent: 3916334 (1975-10-01), Hugenholtz
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