Hybrid Inverter-Based Fully Differential Operational Transconductance Amplifiers

Inverter-based Operational Transconductance Amplifiers (OTAs) are versatile and friendly scalable analog circuit blocks. Especially for the new CMOS technological nodes, several recent applications have been extensively using them, ranging from Analog Front End (AFE) to analog-to-digital converters (ADC). This work tracks down current advances in inverter-based OTAs design, comparing their basic fully differential structures, such as Nauta (N), Barthelemy (B), Vieru (V) Mafredini (M) ones, and, addition, mixing them up propose single-ended two-stage hybrid versions. The herein-proposed composition of Barthelemy/Nauta (B/N), Barthelemy/Manfredini (B/M), Nauta/Vieru (N/V), Manfredini/Vieru (M/V) OTAs. All were designed same Global Foundries 180 nm open-source PDK performances compared post-layout simulations.