A top-down methodology to accommodate circuit interaction within an analogue synthesis system

This paper describes a methodology for designing analog systems starting from a top-level, behavioral model. The methodology has been incorporated within an analog synthesis system (ADSA), which is based upon the use of optimization at both behavioral and circuit levels. Initial design uses ideal models without interaction. Model refinement takes place to accommodate, first, signal offsets and levels, and then, the source and load impedances of the circuit blocks. An example is given of the methodology applied to the design of a Downconverter.