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:
Sep. 28, 1993
Filed:
Apr. 03, 1992
Nokia Matkapuhelimet Oy, Salo, FI;
Fincitec Oy, Kemi, FI;
Abstract
The invention relates to a method and an arrangement for stabilizing a high-order sigma-delta modulator comprising at least two integrator stages and a quantizing means. The first, the first two or the first three integrator stages of the high-order modulator form a low-order modulator which is stable at all input signal values. The arrangement comprises a means for resetting the integrator stages following the low-order modulator when the stable operation range of the high-order modulator is exceeded. For an MF modulator the arrangement further comprises a coupling means for decoupling the output of the last integrator of the high-order modulator from the quantizing means and for coupling the output of said low-order modulator to the quantizing means simultaneously with the resetting.