A New Rail-to-Rail Second Generation Voltage Conveyor

In this paper, a novel low voltage low power CMOS second generation voltage conveyor (VCII) with an improved voltage range at both the X and Z terminals is presented. The proposed VCII is formed by a current buffer based on a class AB regulated common-gate stage and a modified rail-to-rail voltage buffer. Spice simulation results using LFoundry 0.15 mu m low-Vth CMOS technology with a +/- 0.9 V supply voltage are provided to demonstrate the validity of the designed circuit. Thanks to the class AB behavior, from a bias current of 10 mu A, the proposed VCII is capable of driving 0.5 mA on the X terminal, with a total power consumption of 120 mu W. The allowed voltage swing on the Z terminal is at least equal to +/- 0.83 V, while on the X terminals it is +/- 0.72 V. Both DC and AC voltage and current gains are provided, and time domain simulations, where the voltage conveyor is used as a transimpedance amplifier (TIA), are also presented. A final table that summarizes the main features of the circuit, comparing them with the literature, is also given.