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New low-Voltage fully programmable CMOS triangular/trapezoidal function Generator circuit

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4 Author(s)
M. Kachare ; Klipsch Sch. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA ; Jaime Ramirez-Angulo ; R. G. Carvajal ; A. J. Lopez-Martin

A versatile low-voltage CMOS circuit with a triangular/trapezoidal transconductance characteristic and independently programmable slope (keeping constant height or constant width), height (keeping constant slope or constant width), and horizontal position is presented. Simulation results using Cadence DFW-II that verify the functionality of the circuit with ±1.5-V supplies are presented. A chip prototype has been fabricated in a 0.5-μm technology and experimentally verified. The circuit can find application in the implementation of high resolution, high speed folding analog-to-digital converters, in piecewise-linear approximation, and in the implementation of membership functions in analog and mixed-signal neuro-fuzzy systems.

Published in:

IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:52 ,  Issue: 10 )