E. Sanchez-sinencio et J. Silva-martinez, CMOS transconductance amplifiers, architectures and active filters: a tutorial, IEE P-CIRC, 147(1), 2000, pp. 3-12
An updated version of a 1985 tutorial paper on active filters using operati
onal transconductance amplifiers (OTAs) is presented. The integrated circui
t issues involved in active filters (using CMOS transconductance amplifiers
) and the progress in this field in the last 15 years is addressed. CMOS tr
ansconductance amplifiers, nonlinearised and linearised, as well as frequen
cy limitations and dynamic range considerations are reviewed. OTA-C filter
architectures, current-mode filters, and other potential applications of tr
ansconductance amplifiers are discussed.