Title :
A low noise class-AB operational amplifier with noise optimization technique
Author :
Seungheun Song ; Kwanseok Jung ; Subin Kim ; Joongho Choi
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Seoul, Seoul, South Korea
Abstract :
This paper presents a low noise operational amplifier with noise optimization and reduction techniques. It consists of a folded-cascode amplifier and a class-AB output stage with a simple minimum selector. The input-referred noise of an input transistor can be optimized through utilization of the relationship between input parasitic capacitance and flicker noise. The other main noise sources in a folded-cascode amplifier are reduced by increasing the size, adding resistors or by stacking FETs at the cascade biasing circuitry. The proposed amplifier is implemented in a 0.18-μm CMOS process.
Keywords :
CMOS integrated circuits; field effect transistors; flicker noise; low noise amplifiers; operational amplifiers; resistors; CMOS process; adding resistors; cascade biasing circuitry; flicker noise; folded-cascode amplifier; input parasitic capacitance; input transistor; input-referred noise; low noise class-AB operational amplifier; noise optimization; simple minimum selector; size 0.18 mum; stacking FET; Noise; class-ab amplifier; input referred noise; low noise technique; operational amplifier;
Conference_Titel :
SoC Design Conference (ISOCC), 2014 International
DOI :
10.1109/ISOCC.2014.7087548
