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. 23, 1993
Filed:
Nov. 25, 1991
Jean-Claude Abbiate, La Gaude, FR;
Gerard Richter, Nice, FR;
International Business Machines Corp., Armonk, NY (US);
Abstract
Sigma-delta converter for converting an analog input signal into a sigma-delta code. The converter includes a threshold device (222) for generating an output and feedback signal, a filter receiving said analog input signal and said feedback signal from at least one feedback loop. The sigma-delta converter further includes circuits (221, 222) located in said feedback loop for performing a return-to-zero of the sigma-delta code generated by said threshold device at every period of the sigma delta clock, whereby said sigma-delta converter is insensitive to the asymmetry of the rise and fall time of the threshold device. This results in an increase of the signal-to-noise ratio and linearity of the converter, allowing the manufacture of a sigma-delta convertor with discrete components without requiring the development of an integrated circuit using switched capacitor technology.