Title :
A sub-1V high-gain two-stage OTA using bulk-driven and positive feedback techniques
Author :
Khameh, H. ; Shamsi, H.
Author_Institution :
Qazvin Branch, Dept. of Electr. & Comput. Eng., Islamic Azad Univ., Qazvin, Iran
Abstract :
This paper presents the design and simulation of a fully differential two-stage operational trans-conductance amplifier (OTA) in a 0.18μm CMOS process with a 0.9V supply voltage. For this purpose, both the bulk-driven and positive feedback techniques are employed. These techniques increase the dc gain about 18.4 dB without any change in the power dissipation, unity-gain bandwidth, phase margin, and other specifications of the OTA. The simulation results show a dc gain of 73.8dB, unity-gain bandwidth of 272MHz and phase margin of 64°. The slew rate is 190V/μs and the OTA dissipates about 2.72mW from a 0.9V supply voltage.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; feedback; operational amplifiers; CMOS process; bulk-driven feedback technique; differential two-stage operational transconductance amplifier; frequency 272 MHz; gain 73.8 dB; phase margin; positive feedback technique; power dissipation; size 0.18 micron; sub-IV high-gain two-stage OTA; unity-gain bandwidth; voltage 0.9 V; CMOS integrated circuits; CMOS technology; Equations; Gain; Mathematical model; Resistors; Transistors; Bulk-driven; Operational transconductance amplifier(OTA); Positive feedback;
Conference_Titel :
Circuits and Systems for Communications (ECCSC), 2010 5th European Conference on
Conference_Location :
Belgrade
Print_ISBN :
978-1-61284-400-8
