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

fYear

2009

fDate

13-15 Nov. 2009

Firstpage

1

Lastpage

4

Abstract

A low-power rail-to-rail operational amplifier (Op-amp) was realized in SMIC 0.18 Â¿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 g_m/I_d value, so the power consumption is reduced to only 89.02 Â¿W (C_load = 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/WCSP.2009.5371465

Filename

5371465