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:
Jul. 20, 1999
Filed:
Apr. 01, 1997
Jae-Sun Park, Ahnsan-city, KR;
SamSung Electronics Co., Ltd., Suwon, KR;
Abstract
A PLL for improving a locking time in a radio communication system, includes: a storage unit for digitally storing a series of different control voltages; a digital/analog converter for converting a read control voltage into an analog control voltage; a voltage controlled oscillator oscillating at a frequency in accordance with a level of a supplied analog control voltage or signal; a variable divider for frequency dividing the voltage controlled oscillator output in accordance with a variable dividing ratio determined by a system operating mode; a phase comparator for comparing a phase of the variable divider output with an externally supplied reference signal, and for outputting a phase difference signal indicative of a comparison result; a low-pass filter low-pass for filtering the phase difference signal; a level detector for comparing a level of the low-pass filter output with a reference level, and for generating a digital comparison result signal; a controller for reading one of the series of stored control voltages using the level detector output supplied to the digital/analog converter, and for performing a read operation until the level detector output is within a predetermined range; and a switch for supplying the digital/analog converter output to the voltage controlled oscillator.