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. 14, 2000
Filed:
Mar. 06, 1996
Burr-Brown Corporation, Tucson, AZ (US);
Abstract
A programmable gain delta sigma analog-to-digital converter includes an analog input terminal receiving an analog input voltage, a charge summing conductor, an input capacitive switching circuit, and a feedback reference capacitive switching circuit coupled to the charge summing conductor. An integrator is coupled between the charge summing conductor and a comparator which supplies a stream of digital pulses to a digital filter that produces a digital number representing the analog input voltage. The feedback reference capacitive switching circuit includes a plurality of reference sampling capacitors, selectively coupling charge between a feedback reference voltage source and an integrating capacitor of the integration in response to a programmable gain control circuit so as to provide a selected gain for the analog-to-digital converter. The sampling rate of the capacitive switching circuits is adjusted proportionally to the selected gain to improve the dynamic range of the analog-to-digital converter.