A state-variable filter with 2kHz-8kHz voltage-controlled center frequency based on ALD1106 quasi-floating-gate transistors

Abstract

A state variable filter with center frequency tuning capability is presented. Tuning is achieved by means of voltage-controlled integrators based on quasi-floating- gate transistors. An experimental prototype realized with three operational amplifiers, six capacitors, four resistors and four ALD1106 NMOS transistors presented tuning capability from 2kHz to 8kHz, with 0.28% of Total Harmonic Distortion in the low-pass response when an input of amplitude 0.2V and frequency 0.1kHz was employed

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Muñiz M. C., Sánchez G. L. A., Cordero H. J., Trejo M. F. R., Romero y Viloria R. J., González M. F. O. 2015. A state-variable filter with 2kHz-8kHz voltage-controlled center frequency based on ALD1106 quasi-floating-gate transistors. Universidad Politécnica de Puebla. Revista Visión Politécnica. 2015. Número 1. pp. 3-7.

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