The spreading of IoT (Internet of Things) devices has posed a great challenge to the world of integrated circuit design. Systems need to be increasingly smaller and consume less energy, as they are sometimes powered by small batteries or in combination with energy harvesting devices. Technology scaling has allowed digital circuits to benefit from it. Analog subsystems, on the other hand, represent the bottleneck in terms of power dissipation and occupied area. Operational transconductance amplifiers are essential for building analog subsystems such as filters, front-end signal conditioning circuitry or inter-stage amplificatior for ADCs. To be included in the construction of IoT devices, they must meet the conditions of low power dissipation and small occupied area.