A Negative Resistance-Based ULV Variable-Gain OTA for Low-Power Applications. - Suzian Mahéli R. Santos; Tailize C. De-Oliveira; Alessandro Girardi; Paulo César Comassetto de Aguirre; Wilhelmus A. M. Van Noije; Lucas Compassi Severo (IEEE Trans. Circuits Syst. II Express Briefs, 2024)