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Systems designed by humans have no "intelligence" and only execute algorithms; however, they may, somehow, mimic an intelligent behaviour (smart systems). Since, at present, information management in the electrical energy domain is extremely advantageous, smart systems require, all together, sensors, actuators, and electronic interfaces. In literature there is some confusion, and even some contradiction, between the parameters used for characterizing the properties of sensors and of electronic interfaces. In the first part of the paper we provide a unified, coherent set of definitions which may be applied to both sensors and electronic interfaces. Afterwards we show how non-electrical systems may be conveniently analysed in the electrical domain by means of equivalent circuits, and we review some techniques for the design of high performance electronic interfaces; finally, we show a few examples, which illustrate the use of those techniques in practical applications. © 2006 Elsevier B.V. All rights reserved

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A new current mode building block named voltage and current gain second generation current conveyor (VCG-CCII) is introduced. The voltage and current buffers of the standard CCII are replaced by voltage and current amplifiers with tunable gains so to obtain an extremely flexible and versatile building block. The VCG-CCII can be used in place of the standard CCII in impedance conversion applications so to utilize only one active component. A circuit implementation in a standard 0.35 lm CMOS process is presented and used to multiply, as an example, a 10 pF capacitor by a factor tunable from 1 up to about 3100, achieving a capacitance multiplication for more than 6 decades frequency range (from 0.15 to 865 KHz for the highest multiplication factor).

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