Title :
Constant-gm low-power rail-to-rail operational amplifier
Author :
Zhang, Yi ; Meng, Qiao ; Wang, Zhigong ; Chen, Shuoxi
Author_Institution :
Inst. of RF-&OE-ICs, Southeast Univ., Nanjing, China
Abstract :
A low-power rail-to-rail operational amplifier (Op-amp) was realized in SMIC 0.18 ¿m CMOS process. Under a 1.8 V supply voltage, a constant transconductance (within 5.4% of maximum variation) is ensured for the whole common-mode input range. The class AB output stage also has a full voltage swing. The circuit provides a gain bandwidth of 17.3-MHz and a DC gain of 99.6 dB. The input transistors operate in weak inversion, which have big gm/Id value, so the power consumption is reduced to only 89.02 ¿W (Cload = 5pf).
Keywords :
CMOS analogue integrated circuits; low-power electronics; operational amplifiers; CMOS process; class AB amplifier; constant transconductance; gain 99.6 dB; power 89.02 muW; rail-to-rail operational amplifier; size 0.18 mum; voltage 1.8 V; Bandwidth; CMOS process; Circuits; Energy consumption; Gain; Operational amplifiers; Rail to rail amplifiers; Rail to rail operation; Transconductance; Voltage; CMOS analog integrated circuits; Rail-to-rail; constant-gm; low power;
Conference_Titel :
Wireless Communications & Signal Processing, 2009. WCSP 2009. International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-4856-2
Electronic_ISBN :
978-1-4244-5668-0
DOI :
10.1109/WCSP.2009.5371465
