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:
Nov. 17, 1992
Filed:
Apr. 04, 1991
Mika E Niemio, Salo, FI;
Nokia Mobile Phones Ltd., Salo, FI;
Abstract
The object of the description is a phase-locked loop circuit in the form of an integrated circuit (IC) including in sequential connection a digital phase comparator, to the input of which is supplied a reference frequency (fref); a loop filter; and a voltage-controlled oscillator, from which a feedback branch is fed to the second input of the phase comparator. The voltage (.phi.V; .phi.R) of the pulses obtained from the digital phase comparator is disposed so as to be adjusted by limiting means so as to modify the bandwidth and rate of the loop. The adjustment of the voltage of the pulses can be carried out, e.g., by limiting the supply voltage of the phase comparator or by means of an exterior diode or transistor limiter (Q2, Q3). The circuit is usable e.g. in radiotelephone applications, in which loop rate is increased during channel switching.