Circuits

Analog-Digital Conversion by Walt Kester

By Walt Kester

Facts Converter Histories
Fundamentals of Sampled information Systems
Data Converter structure, procedure expertise, checking out, Interfacing, aid Circuits, functions, layout innovations

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P. Barr, "Influence of Aperture Time and Conversion Rate on the Accuracy of A/D Converters," Data Systems Engineering, May 1964, pp. 30-34. 13. A. 44-46. 14. J. Freeman, "Specifying Analog to Digital Converters," The Electronic Engineer, June 1968, pp. 4448. 15. Bernard M. Gordon, "Speaking Out on Analog to Digital Converters," EEE Magazine, December 1968. 16. Bernard M. Gordon, "Bernard Gordon of Analogic Speaks Out on What's Wrong with A/D Converter Specs," EEE Magazine, February 1969, pp. 54-61.

39: Hybrid ADC and DAC Milestones of the 1970s Both the HDS-series DACs and the HAS-series ADCs utilized actively trimmed thick film resistors and discrete PNP transistor switches for the internal DACs. It should be noted at this point that none of the monolithic or hybrid ADCs of the 1970s were sampling ADCs with internal sample-and-holds (SHAs). 43 ANALOG-DIGITAL CONVERSION and timing circuits). This generated the need for hybrid SHAs, such as the HTC-0300 and the faster HTS-0025. Modular Data Converters of the 1970s Designers of modular data converters in the 1970s had even more flexibility than hybrid designers.

In 1964 and 1965, Fairchild introduced two famous Bob Widlar IC designs: the µA709 op amp and the µA710/µA711 comparator. These were quickly followed by a succession of linear ICs from Fairchild and other manufacturers. The 7400-series of transistor-transistor-logic (TTL) and high-speed emitter-coupled-logic (ECL) also emerged during this period as well as the 4000-series CMOS logic from RCA in 1968. In addition to these devices, Schottky diodes, Zener reference diodes, FETs suitable for switches, and matched dual JFETs also made up some of the building blocks required in data converter designs of the period.

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