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:
May. 08, 2001
Filed:
Apr. 15, 1998
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A multiband PLL frequency synthesizer is disclosed which includes: a reference signal generation circuit for generating a reference signal of which frequency is controlled; a phase comparator for generating a phase difference signal; a low-pass filter circuit for low-pass-filtering the phase difference signal with one of a plurality of cutoff frequencies selected; a VCO for generating and outputting a LO signal according to an output of the low-pass filter; a frequency dividing circuit having an integer frequency dividing mode and a fraction frequency dividing mode to supply the frequency-divided signal to the phase comparator; and a control circuit for supplying the reference frequency control signal to the reference signal generation circuit, a filter control signal to the low-pass filter circuit, and frequency dividing control signal (data) to the frequency dividing circuit in accordance with a frequency command signal. The cutoff frequencies and the frequency dividing mode are selected to control the loop condition in accordance with the frequency command signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile