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:
Aug. 10, 1993
Filed:
Jun. 02, 1992
Richard K Hester, Whitewright, TX (US);
Khen-Sang Tan, Singapore, SG;
Michiel de Wit, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A capacitor array circuit is disclosed herein. A main capacitor array includes at least a most significant array portion 12 and a least significant array portion 14. A coupling capacitor C.sub.C is formed between the two portions of the array. Typically, one plate of the coupling capacitor C.sub.C is coupled to a top plate of each of the capacitors in the least significant array portion 14 and a second plate of the coupling capacitor C.sub.C is coupled to a top plate of each of the capacitors in the most significant array portion 12. A variable calibration capacitor C.sub.CAL is also provided. In a preferred embodiment, the variable calibration capacitor C.sub.CAL is coupled between the coupling capacitor C.sub.C and an AC ground node. In alternate embodiment, the variable calibration capacitor C.sub.CAL is coupled in parallel with the coupling capacitor C.sub.C. In the preferred embodiment, the variable calibration capacitor C.sub.CAL comprises array 26 of calibration capacitors 28a-28n, each associated with a switch element 30a- 30n. The array 26 may be a binary weighted array.