Class AB flipped voltage follower with very low output resistance and no additional power

IEICE Electronics Express

Ivan Padilla-Cantoya¹  Jaime Ramirez-Angulo²  Jesus E. Molinar-Solis³ 

[1] Departamento de Electronica, Sistemas e Informatica DESI, Instituto Tecnologico y de Estudios Superiores de Occidente ITESO;Electrical and Computer Engineering Department, New Mexico State University;Instituto Tecnologico de Ciudad Guzman ITCG

关键词: analog integrated circuits;    CMOS integrated circuits;    amplifiers;    low-voltage low power design;   

DOI  :  10.1587/elex.15.20171170

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

A modified version of the flipped voltage follower (FVF) with class AB operation and very low output resistance is presented. Instead of passing one of the large bidirectional output currents through the voltage following transistor, which considerably degrades the output resistance as in other variations, the proposed circuit maintains a constant current in this device and, hence, a very low output resistance. Complementary-type output transistors that depend on the same signal give the circuit the ability to provide large bidirectional currents at high frequency. The implementation only requires an additional resistor and one connection change, with no additional power consumption. Simulation and experimental results of the fabricated circuit in a 0.5 µm technology show an output resistance of the proposed circuit of 12 Ω, with an enhancing factor of 60 with respect to previously reported variations.

【 授权许可】

CC BY