Phase-locked loop with switchable loop filter

Details Phase-locked loop with switchable loop filter Phase-locked loop with switchable loop filter

H - Electricity

03

L

331/40

H03L 7/06 (2006.01) H03L 7/107 (2006.01)

Patent

CA 1078472

ABSTRACT: Phase-locked loop having a controllable oscillator and a phase detector for generating an output signal which is applied as control signal to the oscillator through a loop filter comprising a storage element, which loop filter is switchable un- der the control of a control circuit between a first state wherein the loop filter has a wide passband and a secind state wherein the loop filter has a narrow passband, provided with an arrangement con- nected to said storage element for determining the instants at which the instantaneous value of the signal stored in the storage element is equal to the average value of the control signal for the oscillator, the control circuit being arranged such that, after locking, switching-over of the loop filter from the first to the second state is done at one of the instants determined by said arrange- ment. - 15 -

285193

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