Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1992-06-02
1993-08-10
Logan, Sharon D.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341156, 341150, 341145, 341121, H03M 110, H03M 168, H03M 112
Patent
active
052353354
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.
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de Wit Michiel
Hester Richard K.
Tan Khen-Sang
Donaldson Richard L.
Kesterson James C.
Logan Sharon D.
Matsil Ira S.
Texas Instruments Incorporated
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