SUMMARYThe paper presents an algorithmic approach to a low-sensitivity design strategy for analog filter pairs based on a gyrator-capacitor prototype circuit. The general structure of the prototype circuit is proposed. It assumed that the generic structure of the prototype circuit can evolve, with the use of additional gyrators, into a circuit with increased redundancy. It is shown that symbolic analysis of the prototype circuit, used to formulate a set of nonlinear algebraic equations, is necessary to achieve a sufficiently high algorithm operation speed. To find a solution to this specific system of nonlinear algebraic equations, different numerical methods are compared. The modified Hooke and Jeeves algorithm is found to be the most effective. The elaborated algorithms and programs are illustrated with the seventh-order filter pair example. The obtained filter is better than the filter obtained using LC ladder structures with respect to chip area and power consumption, and these improvements are obtained without loss of sensitivity properties.

Abstract. The current work is an answer to the problem of designing switched-current (SI) circuits, which is usually a complex issue in the field of microelectronics. The mentioned task is a source of many mistakes and takes a lot of time for designers, therefore authors of the article decided to propose a software solution. This article presents an environment for design automation of analogue circuits in the switched currents technique. It points out the utility advantages of the described tools, which make the work of a VLSI designer much easier, moreover offering a possibility to parameterise the design process considering power consumption, chip area usage and its working speed. It also presents results of an automatic generation of a filter pair circuit, as well as a DCT circuit -automatically generated with the proposed SI-Studio software tools.

SUMMARYThis paper presents an approach to a low-sensitivity design strategy for switched-current (SI) filter pairs based on a gyrator-capacitor prototype circuit. On the basis of a prototype filter, an SI counterpart circuit is obtained. Tools for SI filter design automation have been developed, which make a hardware description language -analog-mixed signal synthesization for the chosen kind of circuit. The obtained SI filter is better than the filter obtained using LC ladder structures with respect to very-large-scale integration complementary metal-oxide-semiconductor chip area and power consumption.

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