Stakhov O. The method of building high-performance ADCs with weight redundancy

The object of research is the process of converting electrical signals in electronic circuits of analog devices based on broad-band push-pull DC amplifier. The aim of the dissertation is to increase the performance of the successive approximation ADCs by introducing of information redundancy. The main methods of research are: the method of building of successive approximation ADCs and tracking type ADCs, the method of heuristic synthesis of electronic circuits; method of creating AC systems; schematic engineering methods of analog device’s building; a method of computer modeling of electronic circuits using modern integrated packages of applied programs for circuit analysis. Theoretical results: for the first time, a method of increasing the performance of an ADC with a weight redundancy by using successive approximation and tracking balancing with a weight redundancy was proposed; the method of building highly linear push-pull voltage buffers has been improved which, unlike existing approaches, due to the push-pull organization allows you to significantly reduce the additive error of the circuit and within the output range to identify and evaluate the potential levels of static errors, in particular, the linearity error as in the mode of small and large signals; received further development: the amplitude-frequency characteristic and phase-frequency characteristic models of broadband high-linear push-pull direct current amplifiers as well as analog nodes based on them with the use of computer circuit analysis which made it possible to predict the characteristics of the analog-digital conversion channel; analytical expressions for the transfer characteristics of current-to-voltage and voltage-to-voltage converters which take into account the input resistances of push-pull current amplifiers as well as other factors affecting the operating modes of the circuits. Practical results: 1) recommendations for the design of high-performance successive approximation ADCs as well as their analog units based on push-pull structures are proposed. The static and dynamic characteristics of such structures allows use them in designing of multi-bit analog-digital systems; 2) a number of practical solutions have been developed in particular functional and principle schemes of push-pull DC amplifiers, the input resistance of which can be selected in accordance with system requirements, as well as blocks of parametric and compensatory correction of zero current shift and drift which are used in a complex for construction of high-linear analog devices; 3) practical schemes of highly linear buffer devices based on push-pull structures built on transistors of different types of conductivity whose static characteristics may not be identical and will not require matching and devices for parametric adjustment of the zero offset current, have been developed; 4) a system of digital registration of analog signals with increased stability of metrological characteristics is proposed. It ensures minimization of analog-digital conversion errors regardless of the influence of the environment; 5) a broadband push-pull direct current amplifier with low temperature drift based on current-current converters was built. It is used as a power amplifier for highly linear analog circuits; 6) a high-speed buffer device based on a push-pull current amplifier which has a high linearity of the transfer characteristic in a wide frequency range has been developed. The main scientific results and practical recommendations were implemented at the Vinnytsia branch and Khmelnytskyi branch of LTD «Metal Holding Trade», as well as in the educational process at the Department of Computer Engineering of the Vinnytsia National Technical University.