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. 05, 1999
Filed:
Jun. 30, 1997
Steven F Gillig, Roselle, IL (US);
Michael L Bushman, Hanover Park, IL (US);
Lawrence E Connell, Naperville, IL (US);
Motorola Inc., Schaumburg, IL (US);
Abstract
A communication device including a plurality of frequency synthesizers (24, 28, 30). At least one of the frequency synthesizers (24) is driven with a reference frequency from a crystal oscillator (58). The at least one frequency synthesizer (24) includes a phase locked loop with a fractional-N divider (48) which is programmed by a control circuit (64) to vary as a function of temperature compensation, frequency compensation, and a frequency multiplication factor. The output (46) of the at least one frequency synthesizer (24) is used to provide a compensated reference frequency input for the remaining frequency synthesizers (28, 30). The radio provides all the frequency synthesizers (24, 28, 30) with temperature and frequency compensation using a reference frequency from a crystal oscillator (58) and only one high resolution frequency compensating synthesizer (24).