Accession Number:

AD0677693

Title:

SOME PROBLEMS REGARDING THE CONSTRUCTION OF ANALOG-TO-DIGITAL CONVERTERS APPLICABLE FOR LOW-LEVEL INPUT SIGNALS,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1967-11-29

Pagination or Media Count:

11.0

Abstract:

Usually for conversion of low voltages, on the order to 10-100 mv, to digital code, these voltages are first amplified by a factor of about 1000. Another method is suggested for construction of a converter which does not require pre-amplification of the signal. In this method the converter uses a high sensitivity comparison circuit sensitivity on the order of 5-10 microvolts, and a compensating voltage received from a code-to-voltage converter is fed to a divider and then to the comparison circuit. The divider achieves equality of the input and compensating voltages. A block diagram of the comparison circuit is presented and briefly described. It is a highly sensitive dc amplifier constructed on the modulation-demodulation scheme. Schematic diagrams of the transistorized keys used in the modulator and code-voltage converter are presented. It is noted that in order to provide the required accuracy of measurements, a portion of the converter must be kept under temperature control, and strobing must be used in the comparison circuit.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE