Title :
A low-power wide-bandwidth fully differential operational amplifier with current re-using feedforward frequency compensation
Author :
Hwang, Lin-Hong ; Yoo, Changsik
Author_Institution :
Div. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea
Abstract :
A fully differential operational amplifier (op-amp) is described that simultaneously achieves low power consumption and wide bandwidth by employing current-reusing feedforward compensation scheme. In contrast to the conventional feedfoward frequency compensation, the newly developed scheme re-uses the bias current of the second stage of op-amp and therefore the power consumption is minimized. The op-amp designed in a 0.25μm CMOS technology achieves 77dB DC gain, 870MHz unity gain frequency and 56° phase margin for 1pF load capacitance. The op-amp draws 1.8mA from a 2.5V supply.
Keywords :
CMOS analogue integrated circuits; Chebyshev filters; compensation; continuous time filters; feedforward; frequency response; low-power electronics; operational amplifiers; wideband amplifiers; 1.8 mA; 2.5 V; 77 dB; CMOS technology; active-RC continuous-time filter; bias current; current re-using feedforward frequency compensation; fifth-order Chebyshev filter; frequency response; fully differential operational amplifier; low-power wide-bandwidth amplifier; Bandwidth; Broadband amplifiers; CMOS technology; Capacitance; Circuits; Differential amplifiers; Energy consumption; Frequency response; Operational amplifiers; Poles and zeros;
Conference_Titel :
Advanced System Integrated Circuits 2004. Proceedings of 2004 IEEE Asia-Pacific Conference on
Print_ISBN :
0-7803-8637-X
DOI :
10.1109/APASIC.2004.1349396
