Dynamic Performance Comparison of the A/D Converters for the North Warning System
MITRE CORP BEDFORD MA
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During the full-scale development of the ANFPS-124 Radar, the Analog Devices Corporation ADC 12-bit, 4-MHz analog-to-digital AD converter was selected as the only one that met the performance requirements of the system at that time. The ADC converters have been in operation for three years with no known problems however, Paramax formerly Unisys Corporation is proposing to replace them with an AD converter from Data Device Corporation DDC. This paper describes these two converters and the digital test bed used to characterize them. Using the dynamic test results of the ADC converters as a baseline, the performance of the DDC unit is assessed and its applicability to the North Warning System based on the B2 requirements integral and differential nonlinearities, monotonicity, spurious-free dynamic range, signal-to-noise ratio, and transient and overvoltage recovery responses is evaluated. The performance of the new DDC converter was found to be better than the three-year- old units from ADC. However, neither unit met the overvoltage and transient response B2 requirements. Dynamic testing, AD Converters.
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