SOME PROBLEMS REGARDING THE CONSTRUCTION OF ANALOG-TO-DIGITAL CONVERTERS APPLICABLE FOR LOW-LEVEL INPUT SIGNALS,
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 29, 1967
- Accession Number
- AD0677693
Entities
People
- I. G. Ptakhovskii
- P. N. Kopay-gora
Organizations
- National Air and Space Intelligence Center