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:
Mar. 06, 2012
Filed:
Apr. 30, 2010
Salvatore Finocchiaro, Dallas, TX (US);
Francesco Dantoni, Rome, IT;
Salvatore Finocchiaro, Dallas, TX (US);
Francesco Dantoni, Rome, IT;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
In many types of wireless applications (like wireless modems), it is important that the phase locked loops (PLLs) be able to synthesize clock frequencies in a wide tuning range. Because of the complexity of many conventional PLLs (which were deigned to cover wide tuning ranges), there was often a significant delay to achieve phase and frequency lock. Here, an open loop calibration system is provided to coarse tune a PLL very rapidly. Generally, this calibration system employs binary searches to coarsely adjust a voltage controlled oscillator (VCO) from a VCO bank to within a predetermined range around a target frequency.