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:
Jan. 07, 1992
Filed:
Jan. 07, 1991
Juha Rapeli, Oulu, FI;
Nokia Mobile Phones Ltd., Salo, FI;
Abstract
The invention concerns are interpolating frequency synthesizer based on digital phase locking, with which frequencies can be produced which lie between frequencies defined by integer divisors. Traditional frequency synthesizers employ frequency dividers in which the dividing ratio is an integer. The circuit of the invention comprises member (8, 9), in one of which the reference frequency (f.sub.o) or the VCO frequency (f.sub.x), or the frequency obtained from them by division, is multiplied with a coefficient L and in the other member the corresponding frequency is multiplied by L+ .DELTA.L; and members (2, 7), in which the first pulses going to the phase detector (3) are lengthened by a time corresponding to a given integer number k1 of pulses formed in the number (8), and the other pulses are lengthened by a time corresponding to a given integer number k2 of pulses formed in the member (9).