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By Walt Kester

Info Converter Histories
Fundamentals of Sampled info Systems
Data Converter structure, procedure expertise, checking out, Interfacing, aid Circuits, functions, layout ideas

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TEST TOTALS: ASSUME X = 45 X IS X ≥ 32 ? YES RETAIN 32 1 IS X ≥ (32 +16) ? NO REJECT 16 0 IS X ≥ (32 +8) ? YES RETAIN 8 1 IS X ≥ (32 +8 + 4) ? YES RETAIN 4 1 IS X ≥ (32 +8 + 4 + 2) ? NO REJECT 2 0 IS X ≥ (32 +8 + 4 + 2 + 1) ? 23: Basic Successive Approximation ADC (Feedback Subtraction ADC) It is interesting to note that all the fundamental ADC architectures used today had been discovered and published in one form or another by the mid-1960s. 24 shows a detailed timeline for the development of the successive approximation ADC.

Bernard M. Gordon and Evan T. S. Patent 2,997,704, filed February 24, 1958, issued August 22, 1961. (classic patent describes the logic to perform the successive approximation algorithm in a SAR ADC). 20. W. W. Rouse Ball and H. S. M. Coxeter, Mathematical Recreations and Essays, Thirteenth Edition, Dover Publications, 1987, pp. 50, 51. (describes a mathematical puzzle for measuring unknown weights using the minimum number of weighing operations. The solution proposed in the 1500's is the same basic successive approximation algorithm used today).

1, April 1967 (The premier issue of Analog Dialogue— 'A Journal for the Exchange of Operational Amplifier Technology'). 3. Ray Stata, "Operational Integrators," Analog Dialogue, Vol. 1, No. 1, April, 1967 (Reprinted as ADI AN357). 4. Ray Stata, "User's Guide to Applying and Measuring Operational Amplifier Specifications," Analog Dialogue, Vol. 1, No. 3 (Reprinted as ADI AN356). 5. Analog Dialogue, Vol. 3, No. 1, March 1969 (The first issue of Analog Dialogue under the editorial guidance of Dan Sheingold).

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