Title :
Massively multi-topology sizing of analog integrated circuits
Author :
Palmers, Pieter ; McConnaghy, Trent ; Steyaert, Michiel ; Gielen, Georges
Author_Institution :
Dept. of Electr. Eng., K.U. Leuven, Leuven
Abstract :
This paper demonstrates a system that performs multi-objective sizing across 100,000 analog circuit topologies simultaneously, with SPICE accuracy. It builds on a previous system, MOJITO, which searches through 3500 topologies defined by a hierarchically-organized set of 30 analog blocks. This paper improves MOJITO´s results quality via three key extensions. First, it enlarges the block library to enable symmetrical transconductance amplifiers and more. Second, it improves initial topology diversity 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 objectives, returning a tradeoff holding 17438 nondominated designs. The tradeoff is comprised of 152 unique topologies that include the newly-introduced topologies. 59 designs across 12 topologies designs outperform an expert-designed reference circuit.
Keywords :
SPICE; analogue integrated circuits; integrated circuit design; network topology; operational amplifiers; SPICE accuracy; analog integrated circuit; multitopology sizing; optimization-based constraint satisfaction; symmetrical transconductance amplifier; Analog circuits; Analog integrated circuits; Circuit topology; Constraint optimization; Knowledge based systems; Libraries; MOS devices; Mirrors; SPICE; Transconductance;
Conference_Titel :
Design, Automation & Test in Europe Conference & Exhibition, 2009. DATE '09.
Conference_Location :
Nice
Print_ISBN :
978-1-4244-3781-8
DOI :
10.1109/DATE.2009.5090756