Patent ID: 7120217

Claim:
A phase-locked loop circuit comprising: a voltage-controlled oscillator that has plural voltage inputs including at least one first voltage input and at least one second voltage input, and an oscillation output; a phase detector that has an actual frequency input and plural control outputs including first and second control outputs, and that is adapted to detect a phase deviation of an actual frequency received at said actual frequency input relative to a reference frequency, and to produce first synchronization pulses having useful signal components and disturbance signal components at said first control output when said phase deviation is a lagging phase deviation, and to produce second synchronization pulses having useful signal components and disturbance signal components at said second control output when said phase deviation is a leading phase deviation; a feedback path connecting said oscillation output of said voltage-controlled oscillator to said actual frequency input of said phase detector; and a control arrangement interposed and connected between said control outputs of said phase detector and said voltage inputs of said voltage-controlled oscillator; wherein: said control arrangement includes a first channel and a second channel that connect said control outputs to said voltage inputs, said first channel includes respective control inputs respectively connected to said first control output and said second control output, a first charge pump arrangement, and a first loop filter arrangement including at least one first capacitor dimensioned and connected so as to produce a first control voltage signal dependent only on said useful signal components of respective ones of said first and second synchronization pulses, said first channel is connected to said at least one first voltage input of said voltage-controlled oscillator so as to provide said first control voltage signal to said at least one first voltage input, said second channel includes respective control inputs respectively connected to said first control output and said second control output, a second charge pump arrangement, and a second loop filter arrangement differing from said first loop filter arrangement and including at least one passive filter element dimensioned and connected so as to produce a second control voltage signal dependent only on said disturbance signal components of respective ones of said first and second synchronization pulses, and said second channel is connected to said at least one second voltage input of said voltage-controlled oscillator so as to provide said second control voltage signal to said at least one second voltage input.