Design of current-mode MOSFET-C filters using OTRAs

In this paper, third-order current-mode MOSFET-C filters that use operational transresistance amplifiers (OTRAs) with little parasitic capacitance effects are presented. On the basis of the proposed systematic method and design procedure, we can efficiently synthesize third-order active filters with OTRAs along with simplified MOSFET resistor circuits, and all virtually grounded capacitors. Third-order current-mode Chebychev low-pass and high-pass filters are realized to verify the validity of the theoretical analysis. Experimental results employing commercially available current feedback amplifiers are also given. Copyright © 2008 John Wiley & Sons, Ltd.

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