López Martín, AntonioGarde Luque, María PilarAlgueta-Miguel, Jose M.Beloso Legarra, JavierGonzález Carvajal, RamónRamírez-Angulo, Jaime2021-04-262021-04-2620212076-3417 (Electronic)10.3390/app11073271https://academica-e.unavarra.es/handle/2454/39600Energy efficiency is a key requirement in the design of amplifiers for modern wireless applications. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We illustrate different QFG circuit design techniques aimed to implement low-voltage energy-efficient class AB amplifiers. A new super class AB QFG amplifier is presented as a design example including some of the techniques described. The amplifier has been fabricated in a 130 nm CMOS test chip prototype. Measurement results confirm that low-voltage ultra low power amplifiers can be designed preserving at the same time excellent small-signal and large-signal performance.19 p.application/pdfeng© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.AmplifiersAnalog integrated circuitsCMOS integrated circuitsEnergy-efficient amplifiersClass AB circuitsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess