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:
Oct. 15, 1991
Filed:
May. 07, 1990
Rudolf Koch, Unterhaching, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A switched-capacitor sigma-delta modulator includes at least one memory element, at least one comparator connected to the at least one memory element, and at least one integrator connected to the at least one comparator. The at least one integrator has a first input stage including a series circuit of a first switch, a first capacitor with two terminals and a second switch, a third switch for connecting one of the two terminals of the first capacitor to ground potential, and a fourth switch for connecting the other of the two terminals of the first capacitor to ground potential. The at least one integrator also has a second input stage connected parallel ot the first input stage including a series circuit of a fifth switch, a second capacitor having two terminals and a sixth switch, a seventh switch for connecting one of the two terminals of the second capacitor to ground potential, and an eighth switch for connecting the other of the two terminals of the second capacitor to ground potential. Only one integrator with high amplication which is disposed in an outer feedback loop of the sigma-delta modulator, may have the second input stage. The first and second capacitors and the switches of the first and second input stages may be substantially identically set up and the switches have various switching phases.