Local oscillator system and frequency switching method for minim

Oscillators – Beat frequency – Plural beating

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331 49, 331 77, 4551991, 455255, 370123, H03B 2100, H03B 2101

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active

054971284

ABSTRACT:
A local oscillator system carries out a frequency switching method, in which local signals with fewer spurious components can be obtained. The local oscillator system is provided with frequency generators for generating signals with different frequencies and frequency dividers connected to the frequency generators. The dividers divide the frequency of the signals to output the frequency-divided signals while operating in an active mode and output undivided signals while the dividers are operating in inactive mode. The dividers are controlled so that one of the dividers is in the active mode and the remaining dividers are in the inactive mode. The output signals from the dividers are combined with each other to form a single output signal and then the single output signal is sent to a filter. The filter selects a component having a desired local frequency from the single output signal. Spurious components caused by unselected frequencies are removed by the filter because they are not divided.

REFERENCES:
patent: 3332038 (1967-07-01), Stanley et al.
patent: 3379992 (1968-04-01), Hoo
patent: 4659999 (1987-04-01), Motoyama et al.
Patent Abstracts of Japan, JP 60 229 535, vol. 10, No. 87 (E-393) (2144) Apr. 5, 1986.

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