Multiloop phase-locked loop circuit

Details Multiloop phase-locked loop circuit Multiloop phase-locked loop circuit

H - Electricity

03

L

H03L 7/18 (2006.01) H03L 7/087 (2006.01)

Patent

CA 2121390

PLL circuits which have both the merits of analog phase control, in which good C/N ratio can be realized, and the merits of digital phase control, in which broad-band lock can be performed. The PLL circuit includes a VCO for generating an output signal having a frequency which is variable in accordance with a control voltage; frequency-dividing means for frequency dividing the output signal of said VCO to obtain a feedback signal; reference-signal generating means for generating both a digital reference signal and an analog reference signal, each having a reference frequency first phase error-detecting means for comparing a phase of the feedback signal with a phase of the digital reference signal, to obtain a first phase error signal representing a phase error therebetween and integrating the first phase error signal; second phase error-detecting means for comparing the phase of the feedback signal with a phase of the analog reference signal, to obtain a second phase error signal representing a phase error therebetween, and adding the second phase error signal to the integrated first phase error signal to obtain a first composite phase error signal; third phase error-detecting means for comparing the phase of the feedback signal with the phase of the analog reference signal, to obtain a third phase error signal representing a phase error therebetween, and adding the third phase error signal to the first composite phase error signal to obtain a second composite phase error signal; and a low-pass filter for eliminating high-frequency components of the second composite phase error signal to obtain the control voltage for the VCO.

Affiliated with

Also associated with

Rating

Multiloop phase-locked loop circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiloop phase-locked loop circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiloop phase-locked loop circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1607535