On the use of voltage conveyors for the synthesis of biquad filters and arbitrary networks

The Voltage Conveyor (VCII) is the dual of the second generation Current Conveyor (CCII), and has received only a cursory attention in the literature, probably for lack of interesting applications. The VCII has a current buffer between Y and X terminals, and a voltage buffer between X and Z terminals. In this way, it makes it easier to sum (current) signals at the Y node, whereas CCIIs make it easier to sum (current) signals at the X node. Exploiting this difference between the two dual circuits, a very simple N-port synthesizer can be obtained using only N VCIIs. A mixed-signal Y-matrix synthesizer using VCIIs is also proposed, which is the dual of a similar one using CCIIs, and can also be used as an N-port analyzer, with an advantage with respect to the CCII-based version related to the possibility of sensing low-impedance (voltage) inputs. An inductor emulator and a lowpass / bandpass biquad filter are also simulated, showing the versatility of the VCII.

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