PLL frequency synthesizer and PLL frequency synthesizing method

Details PLL frequency synthesizer and PLL frequency synthesizing method PLL frequency synthesizer and PLL frequency synthesizing method

1994-08-19

1995-06-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 16, 331 17, 331 18, 331 25, 331DIG2, 455260, H03L 7087, H03L 710, H03L 718

Patent

active

054246873

ABSTRACT:
According to an output from a voltage-controlled oscillator, there are generated by a fractional divider a high-frequency division signal and a low-frequency division number. A phase comparison is conducted between the high-frequency division signal and a high-frequency reference signal by a phase comparator. A phase comparison is carried out between the low-frequency division signal and a low-frequency reference signal by a phase comparator. Either one of the outputs from the phase comparators is selected by a selector to be fed to a filter, thereby producing a control voltage for the voltage-controlled oscillator. A high-resolution division is achieved by the fractional division; consequently, disturbance of the oscillation frequency due to a change-over of the selector is suppressed. There is obtained a PLL frequency synthesizer developing a high-speed lock-up and a highly stable oscillation.

REFERENCES:
patent: 4069462 (1978-01-01), Dunn
patent: 4365211 (1982-12-01), Lee
patent: 4459560 (1984-07-01), Kurihara
patent: 4511859 (1985-04-01), Dombrowski
patent: 4542351 (1985-09-01), Okada
patent: 4598257 (1986-07-01), Southard
patent: 4940952 (1990-07-01), Kegasa
patent: 4943788 (1990-07-01), Laws et al.
patent: 5315269 (1994-05-01), Fujii
patent: 5371480 (1994-12-01), Hedberg et al.

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