Plenary Lecture
On Some Aspects of Sensitivity Determination of Translinear Circuits
Professor Georgi A. Nenov
Higher School of Transport “Todor Kableshkov”
Sofia, Bulgaria
E-mail: gnenov1@gmail.com
Abstract: Despite of the well known advantages of the discrete-time filters during the last decade the researcher interest was attracted again to the continuous-time filters because more of the processed signals are continuous-time in their nature. One of the main topics in this increasing interest is the theory of analysis and synthesis of externally linear-internally nonlinear (ELIN) circuits – e.g. log-domain filters, square-root domain filters, sinh-domain filters, tanh-domain filters etc. The analysis and synthesis of ELIN circuits is accompanied by typical difficulties mainly due to the nonlinear characteristics of the bipolar or MOS transistors. These peculiarities complicate the determination of the main parameters that defines the practical workability of the synthesized ELIN circuits – the sensitivities of first- and second-order. Indeed in the literature they exist some investigations on the problems of ELIN-circuit sensitivity but they refer to some special structures synthesized on the base of passive prototypes, OTA-C-prototypes, active RC-prototypes, state-space derived structures etc. The paper presented is an attempt to find some common approaches to sensitivity determination in a may be greatest class of ELIN-structures – translinear circuits. Here we include the translinear structures obtained on the base of the passive prototypes by using translinear integrators and state-space equation simulation. As an interesting result we observe that the sensitivity index of passive prototypes and of the corresponding translinear decisions are very close independently of the synthesis method used. The practical meaning of this conclusion suffers that the low sensitivity passive prototypes (especially these with ladder structure) are almost quite interchangeable by their translinear equivalents with respect to the corresponding transfer functions.
Brief Biography of the Speaker: Georgi A. Nenov graduated from Technical University, Sofia, Bulgaria in 1962. He worked as an Assistant Professor in Technical University, Varna, Bulgaria (1963-1966), as a Scientific Researcher in Institute of Instrument Design in Sofia (1966-1974) and in Institute of Technical Cybernetics, Bulgarian Academy of Sciences in Sofia (1974-1980), as an Associate Professor in University “Prof. Dr Assen Zlatarov”, Bourgas, Bulgaria (1980-1988) and as an Associate Professor (1988-1995) and Professor (1995) in Higher School of Transport “Todor Kableshkov, Sofia. Prof Nenov defend in 1973 a PhD dissertation on active circuit synthesis and in 1991, a Dr.Sc dissertation on analysis and synthesis of SC-networks. He is a Senior Member of IEEE and a member of Bulgarian Scientific Found. The research interests of Prof. Nenov are in the field of electrical network analysis and synthesis, network sensitivity and neural networks. He is an author and co-author of more than 120 journal and conference papers, 3 books and 1 invited book chapter.