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. 29, 1994
Filed:
Mar. 12, 1993
Manfred Mauthe, Aying/Grosshelfendorf, DE;
Rudolf Koch, Oberhaching, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A sigma-delta modulator includes a first integrator receiving a difference between an input signal being weighted by a first coefficient, and a first reference signal being weighted by a second coefficient. A second integrator receives a difference between the output signal of the first integrator being weighted by a third coefficient, and the first reference signal being weighted by a fourth coefficient. A first quantizer receives the output signal of the second integrator being weighted by a fifth coefficient. A first digital/analog converter converts the output signal of the first quantizer into the first reference signal. A third integrator receives a difference between the output signal of the second integrator being weighted by a sixth coefficient, and a second reference signal being weighted by a seventh coefficient. A second quantizer receive the output signal of the third integrator being weighted by an eighth coefficient. A logic circuit adds together the output signals of the first and second quantizers. A second digital/analog converter converts the output signal of the logic circuit into the second reference signal. A first digital filter is connected downstream of the first quantizer, a second digital filter is connected downstream of the second quantizer, and the digital filters supply output signals being added together.