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Low-voltage CMOS operational amplifiers with wide input-output swing based on a novel scheme

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4 Author(s)
Ramirez-Angulo, J. ; Sch. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA ; Torralba, A. ; Carvajal, R.G. ; Tombs, J.

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

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:47 ,  Issue: 5 )