Title :
A high slew rate, low voltage CMOS class-AB amplifier
Author :
Sivakumari, Kunchala ; Srinivasulu, Avireni ; Venkata Reddy, V.
Author_Institution :
Dept. of E.C.E, VFSTR Univ., Guntur, India
Abstract :
A simple low voltage operational amplifier is introduced with an efficient class-AB output stage. Two biasing transistors are present in between common source stage. This amplifier is simulated in 0.18 μm CMOS technology. The proposed class-AB amplifier is designed to operate from ±500 mV supplies. The simulated phase margin of proposed class-AB amplifier is 87° at the load of 10 kΩ∥1 pF. The class-AB amplifier´s total compensation capacitance is 5 pF, which is less than 50% of conventional amplifiers. The unity gain frequency of proposed class-AB amplifier is 21.17 MHz, when driving a resistive load from 10 kΩ to 500 kΩ and capacitive loads from 1 pF to 5 pF. The slew rates of modified amplifier are 7.5 V/μs and 8.57 V/μs. This modified amplifier greatly increases the slew rate compared to the conventional circuits.
Keywords :
CMOS analogue integrated circuits; operational amplifiers; biasing transistors; capacitance 1 pF to 5 pF; common source stage; low voltage CMOS class-AB amplifier; operational amplifier; phase margin; resistance 10 kohm to 500 kohm; size 0.18 mum; slew rate; voltage -500 V; voltage 500 V; Bandwidth; CMOS integrated circuits; CMOS technology; Gain; Low voltage; Operational amplifiers; Transistors; Analog integrated circuits; Class-AB amplifiers; low volatge; slew rate;
Conference_Titel :
Applied Electronics (AE), 2014 International Conference on
Conference_Location :
Pilsen
Print_ISBN :
978-8-0261-0276-2
DOI :
10.1109/AE.2014.7011717
