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:
Nov. 26, 1991
Filed:
Sep. 13, 1988
Abstract
A noise shaping quantization D/A converter in which an input digital signal is supplied to a single-integration sigma delta modulation circuit having quantization levels which include zero level, with a quantization error signal from the single-integration circuit being supplied to a double-integration noise shaping quantization circuit having quantization levels which also include zero level, and an output signal from the double-integration circuit being differentiated and summed with the single-integration circuit output to obtain a bit-compressed digital signal for D/A conversion. Offset of the analog output signal during a zero hold status of the input digital signal is eliminated, and increased efficiency of supply voltage utilization is attained, together with increased S/N ratio.