PLL synthesizer providing rapid frequency changeover

Details PLL synthesizer providing rapid frequency changeover PLL synthesizer providing rapid frequency changeover

1989-12-21

1991-09-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 16, 331 17, 331 25, 331 36C, 331117R, 331177V, H03L 7093

Patent

active

050477331

ABSTRACT:
A PLL synthesizer includes a voltage-controlled oscillator generating an output signal having a frequency based on a first signal supplied thereto, a PLL control circuit which generates a second signal based on the output signal and a set frequency, a lowpass filter having an input terminal and an output terminal, for filtering the second signal supplied through the input terminal to thereby generate the first signal supplied to the voltage-controlled oscillator through the output terminal, and a switch circuit which is coupled between the input and output terminals of the lowpass filter and which supplies the second signal directly to the voltage-controlled oscillator during a predetermined time when the set frequency is changed.

REFERENCES:
patent: 4516083 (1985-05-01), Turney
patent: 4745372 (1988-05-01), Miwa
patent: 4752749 (1988-06-01), Moger
Grundig Technische Informationen, vol. 28, No. 1/2, 1981, pp. 7-9, R. Lehmann: "Der Synthesizerbaustein im ST 6000".

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