A Second Generation Voltage Conveyor (VCII)-based Transimpedance-mode Instrumentation Amplifier

To amplify the signals from current source transducers, a transimpedance-mode instrumentation amplifier (TIA) is a better choice since the input current can be directly processed without conversion to voltage signal. In this article, a new TIA is described. The circuit implementation comprises 2 second generation voltage conveyors (VClls) and 1 external grounded resistor. Its differential input current is amplified and sent to identical output voltages without an additional voltage buffer. It offers a high differential transimpedance-mode gain and common-mode rejection ratio (CMRR). Its transimpedance gain can be widely adjusted by the external grounded resistor. It can be easily modified to achieve electronic controllability by using an electronic resistor replacing to the grounded resistor to be applied in automatic or microcontroller-based control systems. Several performances of the proposed TIA are investigated via PSpice simulation using commercially available integrated circuit. The output voltage deviation due to temperature variation is about 0.003
^%
/°C. The maximum total harmonic distortion (THD) of output voltage over the considered environments is 0.64%. Total power consumption of the proposed circuit is 0.39W at
$\pm 10\mathrm{V}$
power supply.