The object of the dissertation research are the processes of signal conversion into current DACs in which generators of the same bit currents are used, which are switched to the nodes of resistive matrices.
The purpose of the dissertation research is to increase the linearity of multi-bit redundant DACs based on generators of the same currents by adhering to the principle of superposition of discharge weights in the output signal range, as well as the use of other analog nodes with increased linearity.
During the dissertation research methods were used, which were based on: ADC and DAC theory, theory of linear integrated circuits, theory of electric circuits and signals, methods of introducing excess weight in the form converter, methods of constructing two-stroke voltage buffers, two-stroke DC amplifiers construction of thermostable sources of direct current and voltage.
Theoretical results: for the first time a method of constructing multi-bit DACs with weight redundancy with switching of identical currents in resistive matrix nodes is used, which use discharge current generators with high and ultrahigh output resistances. nonlinearity characteristics of the transformation. The mathematical model for calculation of sectional resistive matrices of DAC depending on the type of configuration and characteristics of the redundant number system used is improved, which allows to perform sectional matrix calculations for arbitrary redundant number systems. Methods for improving the accuracy of broadband high-line two-stroke DC amplifiers through the use of folded transistors, the principle of amplification of currents and current feedback, which allows to increase their linearity and load capacity and two-stroke voltage buffers through the use of folded transistors and internal transistors connections, which increases their input resistance. Methods for constructing thermostable DC and voltage generators using the voltage of the band gap of the semiconductor through the use of folded transistors, current reflectors and additional feedback have been further developed, which allows to increase their thermal stability by 2-3 orders of magnitude.
The practical results are the development of structural and basic electrical circuits: multi-bit (14-20 binary discharges) current DACs with excess weight, used to generate high-line signals; high-resistance generators of discharge currents (output resistance 107-109 Ohms) for excess DACs, thus maintaining the principle of superposition of the weights of the discharges in the range of the output signal during their switching; broadband high-line two-stroke DC amplifiers with balanced feedback (nonlinearity of 10-8 A output current in the output signal range ± 1 mA), as well as structural and basic electrical circuits of two-stroke voltage buffers (input resistance 1-10 Gм); thermostable sources of direct current and voltage using the voltage of the band gap of the semiconductor (temperature coefficient 0.006-0.3ppm / ° C).
The results also complemented the programs of such disciplines as "Linear integrated circuits" taught to undergraduate students, "Analog-digital systems" taught to master's students, and "Analog-digital devices of computer systems" taught by doctoral students philosophy of direction 123 "Computer Engineering". It is these results of the dissertation research, which are aimed at solving specific problems of development and use of information and measuring systems, transferred for implementation to LLC MATEK PLUS.
