Guest Editorial Special Issue on the International Symposium on Integrated Circuits and Systems—ISICAS 2021

This Special Issue of the IEEE Transactions on Circuits and Systems—I: Regular Papers (TCAS-I) includes papers presented at the International Symposium on Integrated Circuits and Systems (ISICAS) 2021, held in a hybrid way due to the COVID-19 pandemic, on December 9–11, 2021, in Singapore. This is the fourth edition of this journal track symposium as part of the initiative of the IEEE Circuits and Systems Society (CASS), started in 2018. The Symposium welcomes high-quality original research papers in the areas of integrated circuits and systems, including but not limited to analog, digital, power, energy, biomedical, sensory, and communications systems. A reader will notice that all the papers presented in this Special Issue and at the conference describe integrated implementations in CMOS, hybrid, SiP or SoC forms with experimental results—this is a mandatory requirement of the Symposium.