Title :
120nm CMOS operational amplifier with high gain down to ±0.3V supply
Author :
Schlögl, F. ; Dietrich, H. ; Zimmermann, H.
Author_Institution :
Inst. of Electr. Meas. & Circuit Design, Vienna Univ. of Technol., Austria
Abstract :
A fully differential 3-stage operational amplifier in 0.12 μm digital CMOS technology achieving a differential gain in excess of 86 dB in a supply voltage range from ±0.3 V to ±0.6 V is presented. This operational amplifier contains only regular-VTh transistors. It uses a pseudo-cascode input differential stage and a pseudo-cascoded load for the high gain. Positive feedback is primarily implemented for a good common-mode rejection. A transit frequency of 46 MHz and a phase margin of 66° at a ±0.6 V supply and with a load of 10 pF have been measured. The current consumption is less than 1.8 mA in the temperature range from -30 to +150°C.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; feedback amplifiers; integrated circuit design; integrated circuit measurement; low-power electronics; operational amplifiers; -30 to 150 degC; 0.12 micron; 0.3 to 0.6 V; 1.8 mA; 10 pF; 46 MHz; 86 dB; CMOS operational amplifier; common-mode rejection; differential operational amplifier; digital CMOS technology; high gain operational amplifier; phase margin; positive feedback; pseudo-cascode input differential stage; pseudo-cascoded load; transit frequency; Analog circuits; CMOS technology; Differential amplifiers; Digital circuits; Feedback; Frequency; Operational amplifiers; Power supplies; Transistors; Voltage;
Conference_Titel :
SOC Conference, 2003. Proceedings. IEEE International [Systems-on-Chip]
Print_ISBN :
0-7803-8182-3
DOI :
10.1109/SOC.2003.1241476
