Title :
High-performance frequency compensation topology for four-stage OTAs
Author :
Grasso, Alfio Dario ; Palumbo, Gaetano ; Pennisi, Salvatore ; Di Cataldo, Giuseppe
Author_Institution :
Dipt. di Ing. Elettr. Elettron. e Inf., Univ. of Catania, Catania, Italy
Abstract :
A power-efficient frequency compensation technique for four-stage transconductance amplifiers is proposed. Stability analysis and design equations are carried out based on the small-signal model. To verify the effectiveness of the compensation scheme, a four-stage amplifier is designed in a standard CMOS 65-nm technology. The compensation exploits passive components only and is implemented without entailing extra transistors, thus saving circuit complexity and power consumption. The amplifier achieves a 19-MHz gain-bandwidth product when driving a 1-nF capacitance by consuming only 80 μW from a 1-V supply. Simulation results show a significant improvement in both small-signal and large-signal amplifier performance with respect to prior art.
Keywords :
CMOS analogue integrated circuits; circuit complexity; circuit stability; compensation; energy conservation; integrated circuit design; low-power electronics; microwave amplifiers; network topology; operational amplifiers; power consumption; CMOS technology; capacitance 1 nF; circuit complexity; compensation scheme; design equations; four-stage OTA; four-stage transconductance amplifiers; frequency 19 MHz; frequency compensation topology; operational transconductance amplifiers; passive components; power 80 muW; power consumption; power-efficient frequency compensation technique; size 65 nm; small-signal model; stability analysis; voltage 1 V; CMOS integrated circuits; Capacitance; Feedforward neural networks; Gain; Topology; Transconductance; Transistors; Analog integrated circuits; OTA; frequency compensation; multi-stage amplifiers;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2014 21st IEEE International Conference on
DOI :
10.1109/ICECS.2014.7049959
