Sergio Callegari Federico Bizzarri Output Filter Aware Optimization of the Noise Shaping Properties of ΔΣ Modulators Via Semi-Definite Programming. 2352-2365 2013 60-I IEEE Trans. Circuits Syst. I Regul. Pap. 9 https://doi.org/10.1109/TCSI.2013.2239091 https://www.wikidata.org/entity/Q57829100 db/journals/tcas/tcasI60.html#CallegariB13