Parallel analog-to-digital converter
Patent 4990917 Issued on February 5, 1991. Estimated Expiration Date: 
March 7, 2009. 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.
March 7, 2009. 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 3688221 3735264 3736586 InventorAssigneeApplicationNo. 319621 filed on 03/07/1989US Classes:341/159, Parallel type341/138NonlinearExaminersPrimary: Shoop, William M. Jr.Assistant: Hoff, Marc S. Attorney, Agent or FirmInternational ClassH03M 001/36Foreign Application Priority Data1988-03-08 JPAbstractA parallel analog-to-digital converter having reference-voltage generating means dividing the fundamental reference voltage into exponential reference voltages according to an exponential scale, and further dividing each voltage between two consecutive exponential reference voltages into a plurality of individual reference voltages. As a result, the individual reference voltages have a nonlinear (exponential) characteristic that as the amplitude of an analog input voltage increases, the increment of the individual reference voltages becomes larger exponentially, thus greatly reducing the number of comparators. | |
