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:
Sep. 13, 1983
Filed:
Apr. 28, 1981
Tousaku Nakanishi, Nara, JP;
Hiroshi Tsuda, Uji, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
Errors in determining a measured voltage are mathematically canceled in an analog-to-digital converter circuit useful for dual slope type using positive and negative values of a reference voltage. The errors are due to the off-set voltages inherent to operational amplifiers employed for an integrator and a comparator included within the analog-to-digital converter circuit. A counter circuit is provided for storing time information related to first and second dual slopes. A mathematical calculation is conducted with the aid of all the time information of the first and second dual slopes, whereby the measured voltage can be determined with eliminating the influence by the off-set voltage.