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New circuit topology for realising simple voltage-mode analogue functions, using one differential voltage current conveyor with positive output and a maximum of three passive elements, is proposed. The new topology can realise nine circuits including amplifier, integrator, differentiator and first-order all-pass filters. All the circuits show wide linearity, low total harmonic distortion (THD) and a simple realisation. Non-ideal and parasitic study is also given. As application examples, the new analogue blocks are used in realising biquad filter and third order quadrature oscillator. The proposed theory is validated by PSPICE simulation results as well as experimental results using AD844s. The catalogue of simple circuits along with their applications makes the work a future prospect for adoption to IC implementation by analogue IC producers.
Date of Publication: June 2009