Mixed-Mode Biquadratic Filter Using Only Two DVCC and Grounded Passive Components

This paper presents a new mixed-mode (including voltage, current, transadmittance, and transimpedance modes) biquad filter using only two differential voltage current conveyors (DVCCs), two grounded capacitors and three grounded resistors, which are the least number of active components and the minimum number of grounded passive components necessary for realizing current-mode (with high output impedance) and transimpedance modes all five universal filtering responses (lowpass, highpass, bandpass, notch, and allpass), in addition to high input impedance voltage-mode and fully cascadable transadmittance-mode highpass and bandpass filtering responses without changing the filter topology. This represents the attractive feature from chip area and power consumption point of view. Moreover, the proposed biquadratic filter still enjoys many advantages like having no need of components matching conditions, in addition to using only grounded passive components, no need of extra inverting or non-inverting amplifiers for special input signals, and low active and passive sensitivities. H-Spice simulation results confirm the theory. Keywords—Active filters, differential voltage current conveyors (DVCCs), mixed-mode, biquadratic filter.