By Peter Kinget, Michiel Steyaert

When evaluating traditional computing architectures to the architectures of organic neural structures, we discover a number of impressive variations. traditional pcs use a low variety of excessive functionality computing components which are programmed with algorithms to accomplish projects in a time sequenced method; they're very profitable in administrative functions, in medical simulations, and in yes sign processing functions. despite the fact that, the organic structures nonetheless considerably outperform traditional desktops in belief projects, sensory facts processing and motory keep watch over. organic platforms use a totally dif­ ferent computing paradigm: a major community of straightforward processors which are (adaptively) interconnected and function in parallel. precisely this vastly parallel processing turns out the most important point to their luck. nevertheless the improvement of VLSI applied sciences supply us with technological capability to enforce very complex platforms on a silicon die. specifically analog VLSI circuits in average electronic applied sciences open the best way for the enforce at ion of hugely parallel analog sign processing platforms for sensory sign processing functions and for notion initiatives. In bankruptcy 1 the motivations at the back of the emergence of the analog VLSI of vastly parallel structures is mentioned intimately including the services and !imitations of VLSI applied sciences and the mandatory examine and advancements. Analog parallel sign processing drives for the advance of very com­ pact, excessive pace and coffee energy circuits. a big technologicallimitation reduce the dimensions of circuits and the development of the rate and gear intake functionality is the machine inaccuracies or equipment mismatch.

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50) • The different performance specifications of a current amplifier are linked and depend on technological and physical constants only! 50) shows that a designer can only trade one specification for the other. Due to the impact of transistor mismatch, he cannot choose the different performance specifications independently ! 51) Transistor mismatch puts a boundary on the minimal power consumption by a current amplification stage for a given gain, speed and accuracy specification. 51). The fundamental reason for the appearance of this term is related to the physics of the MOS transistor.

The random errors are the result of the stochastic nature of many physical processes. The stochastic behavior of charge carriers in a conductor, for instance, results in various types of noise signals and the stochastic nature of the physical phenomena that take place during the fabrication of integrated circuits, results in a random variation of the properties of the fabricated on-chip devices and mismatches between identically designed devices. The systematic errors occur because a typical circuit implement at ion only approximates an ideal signal processing operation to a limited extent.

The parameter mismatch is then calculated by subtracting the parameters of the individual transistors. Also a direct extraction technique can be derived from a more complex drain current model which includes a mobility reduction parameter (). The extra mismatch parameter fl(} is however highly correlated to the and the overall modeling of the current mismatch becomes more complicated without improvements in accuracy [Bas 95]. ]I-) • The current measurements are performed in saturation so that parasitic resistances in the drain path do not generate errors.

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