Title :
A 1.2 V rail-to-rail low-power opamp with replica amplifier gain enhancement
Author :
Gerfers, Friedel ; Hack, Christian ; Manoli, Yiannos
Author_Institution :
Inst. of Microelectron., Univ. of Saarland, Saarbrucken, Germany
Abstract :
This paper presents an architecture for a CMOS high-swing 1.2 V low-power fully differential class-AB amplifier (opamp) with a DC-gain of 52 dB. A low-voltage differential input stage is applied as the basic architecture. The replica gain enhancement technique is used to increase the DC-gain without degrading the output swing. Furthermore, this gain enhancement concept does not increase the minimal supply voltage and also allows scaling of the replica amplifier. The power dissipation is 200 μW, providing a gainbandwidth (GBW) of 1.9 MHz with a capacitive load of 30 pF.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; integrated circuit design; integrated circuit measurement; integrated circuit modelling; low-power electronics; operational amplifiers; 1.2 V; 200 muW; 30 pF; 52 dB; CMOS rail-to-rail low-power op amp; GBW; amplifier output swing; capacitive load; fully differential class-AB amplifier; gainbandwidth; high-swing operational amplifier architecture; minimal supply voltage; opamp DC gain; power dissipation; replica amplifier gain enhancement technique; replica amplifier scaling; Computer hacking; Degradation; Energy consumption; Feedback; Frequency; High power amplifiers; Microelectronics; Power supplies; Rail to rail amplifiers; Voltage;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1011014
