Phase-locked loop having a variable bandwidth

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

H - Electricity

03

L

H03L 7/107 (2006.01) H03L 7/089 (2006.01)

Patent

CA 2044257

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.

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