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:
Jul. 11, 2006
Filed:
Oct. 12, 2004
Leopold E. Pellon, Hainesport, NJ (US);
Leopold E. Pellon, Hainesport, NJ (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
A Σ) analog-to-digital converter (ADC) includes an ADC converter element which receives resonated signals for generating output digital signals, and also a DAC for generating a reconstituted analog signal therefrom. A summer sums the reconstituted and input analog signals with filtered signals to generate resonated signals for the ADC element. A resonator includes a filter receiving the resonated signals, for producing the filtered signals for application to the summer. The summing circuit, the ADC element, and the digital-to-analog converter are in a first feedback loop, and the summer and the filter are in a second loop. The only coupling between the loops is the summing circuit. The delays of the loops become isolated from each other, and the overall performance of the sigma-delta ADC is dependent only on the longer of the two individual delays, rather than on the sum of the delays. This provides wider bandwidth A-D conversion ().