Title :
Low-voltage CMOS operational amplifiers with wide input-output swing based on a novel scheme
Author :
Ramirez-Angulo, J. ; Torralba, A. ; Carvajal, R.G. ; Tombs, J.
Author_Institution :
Sch. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA
fDate :
5/1/2000 12:00:00 AM
Abstract :
A scheme to achieve low-voltage wide-bandwidth operation of CMOS op amps with rail-to-rail input and output swing and constant gm is presented. It is based on a novel concept that uses a floating voltage controlled voltage source in the feedback path of the op amp in order to keep its input terminals close to one of the supply rails. Postlayout simulations on a 1.2 V rail-to-rail op amp with 13 MHz GB are presented which verify the proposed scheme
Keywords :
CMOS analogue integrated circuits; feedback amplifiers; low-power electronics; operational amplifiers; wideband amplifiers; 1.2 V; 13 MHz; LV CMOS operational amplifiers; constant gm; feedback path; floating VCVS technique; floating voltage controlled voltage source; low-voltage CMOS opamps; op amps; rail-to-rail swing; wide input-output swing; wide-bandwidth operation; Analog integrated circuits; Broadband amplifiers; Circuit simulation; Feedback; Impedance; Operational amplifiers; Rail to rail inputs; Threshold voltage; Transconductance; Voltage control;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
