Phase-lock-loop system with variable bandwidth and charge pump p

Details Phase-lock-loop system with variable bandwidth and charge pump p Phase-lock-loop system with variable bandwidth and charge pump p

1991-02-07

1992-09-29

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, H03L 7093

Patent

active

051516659

ABSTRACT:
An improved phase lock loop frequency synthesizer capable of handling both analog and digital transmission. The synthesizer includes a reference signal source, a phase detector coupled to the reference signal source, a phase lock loop filter coupled to the phase detector, and a voltage controlled oscillator coupled to the phase lock loop filter for providing an output and a feedback signal to the phase detector. The phase lock loop filter comprising a charge pump coupled to the phase detector for providing a phase lock signal to a charge pump output node, said phase lock signal being variable in response to a bandwidth control signal; and a filter coupled to the charge pump for filtering the phase lock signal at a given bandwidth, said bandwidth being variable in response to the bandwidth control signal.

REFERENCES:
patent: 4156855 (1979-05-01), Crowley
patent: 4546330 (1985-10-01), Okada
patent: 4745372 (1988-05-01), Miwa

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