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. 02, 1993
Filed:
Mar. 16, 1992
Bahram Fotouhi, Cupertino, CA (US);
Roubik Gregorian, San Jose, CA (US);
Other;
Abstract
A circuit technique to achieve 14-bit resolution in a charge-redistribution CMOS analog-to-digital converter. The sign bit plus the six most significant bits are obtained using a 6-bit capacitor array, the next five bits are determined using a resistor array, and finally the last two bits are obtained by use of a second 2-bit capacitor array. The area of the resulting 14-bit A/D converter is not appreciably larger than a corresponding 12-bit A/D converter. The 6-bit capacitor array is realized by connecting unit capacitors of a unit capacitor array. In the second capacitor array, at least one of the capacitors is realized by subdividing the unit capacitor. Since the accuracy of capacitors in the second capacitor array need not be as great as the accuracy of capacitors in the 6-bit capacitor array, subdividing the unit capacitor does not affect the accuracy of the converter.