Cyclic analog-to-digital converter that reduces the accumulation of offset errors
Patent 5995035 Issued on November 30, 1999. Estimated Expiration Date: 
December 15, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 15, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3035258 3187325 Method and apparatus for sampling and holding an analog input voltage which eliminates offset voltage error Serial-type A/D converter utilizing folding circuit cells Pipelined A/D converter Patent #: 4745394 InventorsAssigneeApplicationNo. 990335 filed on 12/15/1997US Classes:341/163, Recirculating341/155Analog to digital conversionExaminersPrimary: Williams, Howard L.Assistant: Pierre, Peguy Jean Attorney, Agent or FirmInternational ClassH03M 001/34Foreign Application Priority Data1996-12-16 SEAbstractCyclic A/D-conversion of an analog input signal is performed according to a new and inventive recursive algorithm which generates a Gray coded digital output signal. In cyclic A/D-conversion, the output bits are generated cyclically, one by one. According to the inventive Gray coding algorithm, the analog input signal is cyclically subjected to a sample and hold operation, selectively, depending on the previously generated output bit, to a signal inversion, to an amplification by two, and to an addition of a predetermined reference signal. In a cyclic A/D-converter architecture based on the recursive Gray coding algorithm according to the invention, the accumulation of offset errors will generally be very low. Furthermore, the fact that the signal inversion is digitally controlled enables high precision implementations which further improve the performance of the cyclic A/D-converter according to the invention.Other References
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