Phase-locked loop having a variable bandwidth

Details Phase-locked loop having a variable bandwidth Phase-locked loop having a variable bandwidth

1990-11-13

1992-03-10

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03L 700

Patent

active

050952889

ABSTRACT:
The invention relates to a phase-locked loop having a variable bandwidth and comprising a controlled oscillator, a phase comparison device, two current generating devices (21-22, 25-26) and a loop filter (23-24). Each of the current generating devices is intended to produce a positive or a negative pulsed current in response to signals from the phase comparison device. The outputs of the current generating devices are each connected to a respective point in the loop filter. The loop bandwidth can be varied continuously while maintaining a desired damping factor, by increasing the amplitude of the currents from each of the current generating devices (21-22, 25-26) when the bandwidth is to be increased, and vice versa.

REFERENCES:
patent: 4546330 (1985-10-01), Okada
patent: 4562411 (1985-12-01), O'Rourke et al.
patent: 4617711 (1979-09-01), Smoot

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