DEVELOPMENT OF 10 BIT AIRBORNE ANALOG TO DIGITAL CONVERTER
Abstract
The development of a radically new type of successive approximation, analog to digital converter employing the rapid and accurate exchange of charge between several capacitors is described. The method makes possible a startling reduction in number of circuit components, total power consumption, size and weight. Furthermore, the technique offers added performance capability with regard to accuracy and speed. Two experimental units were constructed and tested. These units provide 10-bit resolution, 18181 encodings per second, 200-kc bit rate, NRZ output, fullscale input of 0 to +5 volts, input impedance of 1 megohm, inherent sample and hold, continuous operation, or encode upon command. The units use only 45 transistors, require only 6.3 watts from the power supply, and have a volume of only 125 cubic inches and a weight of 3.25 pounds. Recommendations are included for several extensions of the development program to provide higher speeds, with further simplification, military prototype design, lower power consumption, and an unusual multiplexer based on capacitive charge transfer. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 16, 1961
- Accession Number
- AD0259561
Entities
People
- Charles W. Barbour
- Gerald B. Gilbert