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. 24, 2004
Filed:
Dec. 19, 2002
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 continuous-time sigma-delta modulator with discrete time common-mode feedback. The method includes calculating an integrator input signal as a difference between an input signal and a modulation feedback signal, continuous time integrating the integrator input signal to produce an integrator output signal having a common mode voltage, determining the common mode voltage of the integrator output signal using a discrete-time process, determining an integrator feedback signal as a function of the common-mode voltage and feeding back the feedback signal to the integrator in order to maintain the common mode voltage at a substantially constant value, sampling and quantizing the integrator output signal to produce a sigma-delta modulated output signal and converting the sigma-delta modulated output signal from a digital signal to an analog signal, to produce the modulation feedback signal.