Massively multitopology sizing of analog integrated circuits

This paper demonstrates a system that performs multi-objective sizing across 100,000 analog circuit topologies simultaneously, with SPICE accuracy. It builds on a previ-ous system, MOJITO, which searches through 3500 topolo-gies defined by a hierarchically-organized set of 30 ana-log blocks. This paper improves MOJITO’s results qual-ity via three key extensions. First, it enlarges the block li-brary to enable symmetrical transconductance amplifiers and more. Second, it improves initial topology diver-sity via optimization-based constraint satisfaction. Third, it maintains topology diversity during search via a novel multi-objective selection mechanism, dubbed TAPAS. MO-JITO+TAPAS is demonstrated on a problem with 6 objec-tives, returning a tradeoff holding 17438 nondominated de-signs. The tradeoff is comprised of 152 unique topolo-gies that include the newly-introduced topologies. 59 de-signs across 12 topologies designs outperform an expert-designed reference circuit. 1