JUSTIFICATION OF CIRCUIT DESIGN SUGGESTIONS FOR IMPROVING ACCURACY PARAMETERS OF THE INTEGRATING ACCELEROMETER

Abstract

Background. Most modern digital voltmeters use an integrating time-to-pulse analogue-to-digital converter (ADC). The conversion process can be divided into two stages – integration and counting. During the counting, in accordance with the principle of the converter, the integrated input value is compared with the reference value stored in the converter. The goal is to develop a methodology for building f bipolar reference voltage source without reducing the accuracy parameters. Materials and methods. An approach to the construction of a bipolar reference voltage source of an integration analogue-digital converter is presented, in which integration occurs during the entire time of the input signal conversion. The novelty of the approach lies in the development of circuitry solutions for the use of a single precision Zener diode to form a bipolar reference voltage. Results. Presented: principal electrical scheme of a bipolar reference voltage source and its mathematical model of error; recommendations for the choice of a radio elements used; method of the schematic construction of a bipolar reference voltage source. Conclusions. The use of the considered technique allows to increase the stability of the threshold levels of comparison of the Schmitt trigger and, thus, to more accurately integrate the input signal. The results can be used to build integrating ADC for wide application in industrial devices and other fields of science and technology.

Keywords

• analog-to-digital converter
• integrating adc
• linearly varying voltage generator
• voltage-time interval converter
• schmitt trigger