The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 2000
Filed:
May. 27, 1999
Rami Ahola, Helsinki, FI;
Harri Kimppa, Salo, FI;
Nokia Mobile Phones Limited, Espoo, FI;
Abstract
A digital phase comparator comprises a first signal input (VCO) and second signal input (REF) as well as a first output (UP+) and second output (DOWN+). It is arranged so as to produce an output pulse (503, 504) to the first output and second output per each of the cycles of the periodic signals (501, 502) brought to the first signal input and second signal input. The duration of the output pulse produced to the first output is longer than the duration of the output pulse produced to the second output when the phase of the periodic signal brought to the first signal input is lagging with respect to the phase of the periodic signal brought to the second signal input. Correspondingly, the duration of the output pulse produced to the first output is shorter than the duration of the output pulse produced to the second output when the phase of the periodic signal brought to the first signal input is leading with respect to the phase of the periodic signal brought to the second signal input. The phase comparator is arranged so as to make the starting times of the output pulses produced to the first output and second output substantially simultaneous.