Abstract
Starting from a broad description of analogue circuit
design in terms of topology design and sizing, we
discuss the difficulties of sizing and describe
approaches that are manual or automatic. These
approaches make use of blackbox optimisation techniques
such as evolutionary algorithms or convex optimization
techniques such as geometric programming. Geometric
programming requires posynomial expressions for a
circuit's performance measurements. We show how a
genetic algorithm can be exploited to evolve a
polynomial expression (i.e. model) of transistor (i.e.
mosfet) behaviour more accurately than statistical
techniques in the literature.
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