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Low-voltage CMOS op-amp with rail-to-rail input and output signal swing for continuous-time signal processing using multiple-input floating-gate transistors

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

A scheme for low-voltage CMOS op-amp operation with rail-to-rail input and output signal swing and constant gm is presented. Single-ended and fully differential versions are discussed. The scheme is based on the use of multiple-input floating-gate transistors and allows direct implementation of linear weighted addition of continuous-time signals. Simulations are presented that verify the scheme operating with a 1.2-V single supply, 1.2-V input and output solving, 5-MHz op-amp gain-bandwidth product, and a 192-μW power dissipation with a 50-pF load and 300×300 μm2 silicon area. These results are obtained for 0.85-V transistor threshold voltages. Experimental results are shown that verify the correct functionality of the proposed approach

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 1 )