Local oscillation frequency synthesizer for vibration suppressio

Details Local oscillation frequency synthesizer for vibration suppressio Local oscillation frequency synthesizer for vibration suppressio

1993-12-07

1995-06-06

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 17, 331 25, 331 46, 455260, H03L 707

Patent

active

054226040

ABSTRACT:
A local oscillation frequency synthesizer has first and second phase locked loop synthesizers for providing first and second oscillation frequency signals. The local oscillation frequency synthesizer also includes a controller which increases a frequency of the first oscillation frequency signal by a predetermined frequency amount corresponding to the change-over of channels and thereafter decreases the frequency of the first oscillation frequency signal to its original frequency. The controller also increases a frequency of the second oscillation frequency signal after the increase of the first oscillation frequency signal without thereafter decreasing the second oscillation frequency signal to its original frequency. The first and second frequency signals controlled in this manner are combined to form an output frequency signal such that the lowest level in the vibration of the first oscillation signal occurs at the same time that the highest level of the second oscillation signal occurs so that the vibrations of the first and second oscillation signals cancel each other out. Thus, the output oscillation signal resulting from the combination of the first and second oscillation frequency signals has a suppressed vibration disturbance.

REFERENCES:
patent: 3588730 (1971-06-01), Schreuer et al.
patent: 4940950 (1990-07-01), Helfrick
patent: 4965533 (1990-10-01), Gilmore
patent: 4994762 (1991-02-01), Tay
Patent Abstracts of Japan, vol. 10, No. 129 (E-403) May 14, 1986; JP A 60 261 220, Dec. 24, 1985.

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