Phase-locked loop

Details Phase-locked loop Phase-locked loop

H - Electricity

03

L

331/35, 329/8

H03L 7/097 (2006.01) H01L 21/70 (2006.01) H03L 7/091 (2006.01)

Patent

CA 1282465

ABSTRACT OF THE DISCLOSURE A PLL comprising a phase comparator circuit for detecting the phase of a pulse signal based upon the input signal and the phase of a pulse signal based upon the output signal, a smoothing filter for smoothing the output of the phase comparator circuit, a loop filter for controlling the oscillation frequency on the basis of the smoothing filter, and a voltage controlled oscillator circuit for sending out the output signal having a frequency corresponding to the voltage based upon the output of the loop filter. Since the smoothing filter is separated from the loop filter, time constants of the smoothing filter and the loop filter can be set inde- pendently and with precision. If the time constant of the smoothing filter is chosen to be extremely small, for example, the time constant of the phase-locked loop is defined by the time constant of the loop filter. It is thus possible to define the time constant of the phase-locked loop by only selecting the time constant of the loop filter. And it is possible to suppress the jitter of the phase-locked loop and reduce the frequency ripple, for example.

530439

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