Transimpedance Amplifier

Weak signals cannot be measured with high accuracy because measurement instruments need high accurate elements, which increases the costs considerably. Therefore, the sensors’ output must be amplified, and then other conversions and measurements can be applied. Some sensors’ outputs are based on current, and their amplitudes are quite low. Hence, the current must be converted to the voltage for measurement and then becomes amplified for more accuracy in the measuring process. As can be seen, the measurement process needs an I-V converter to convert the sensors’ current output to the voltage, and then the voltage is measured in a data acquisition unit. In this article, the converter unit is discussed comprehensively as a transimpedance amplifier (TIA) is a current to voltage converter.