STATE VARIABILE ACTIVE FILTER USING CURRENT CONVEYORS

摘要

The author describes a method to achieve a new current-mode biquad active filter. The method is based bases on the transformation of the flow graph of a known conventional biquad active filter, as Tow- Thomas filter is. The resulted circuit has some useful features: it uses a reduced number of active and passive elements, all capacitors are grounded and that make it proper for Integration, provides the orthogonal adjustment of Q, ω_o and gain and doesn't require any match conditions to obtain the low-pass, high-pass and band-pass responses. At least, both Input and output signals an voltages.