Optimization of a rail to rail low voltage CCII for active filter applications

In this paper, we deal with an ultra Low voltage Rail to Rail high performance second generation current conveyor (CCII). An optimum transistor sizing was done applying a C++ software. The proposed circuit is able to operate at low voltage supply (plusmn 0.75TV). First, a frequency characterization of the optimized CCII is presented; PSPICE simulation for a 0.35mum CMOS technology show that best performances are obtained with the improved configuration. The current and voltage bandwidths are respectively 1.4834GHz and 2.035GHz, and the parasitic resistance at port X has a value of 87.65Omega for a control voltage of 0.35V. Then, these performances and the low power consumption are quite satisfactory for most RF applications: This CCII was used to realize a new current-mode Programmable Biquad filter and a Universal filter. PSPICE simulation results are included to demonstrate the results.

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