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:
Feb. 17, 2004
Filed:
Feb. 04, 2003
Omid Oliaei, Schaumburg, IL (US);
Matthew R. Miller, Palatine, IL (US);
Patrick L. Rakers, Kildeer, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Systems and methods are described for a digital tuning scheme for continuous-time sigma-delta modulation. The method includes integrating a voltage from a voltage source using a discrete-time integrator to produce a discrete-time integrator output, continuous-time integrating a current from a controllable current source to produce a continuous-time integrator output, quantizing the difference between the continuous-time integrator output and the discrete-time integrator output to produce a quantizer output, controlling a polarity of the controllable current source with the quantizer output, counting the quantizer output to produce a feedback signal, and tuning the controllable current source as a function of the feedback signal.