Operational transresistance amplifier using CMOS technology

The authors describe the design of a versatile analogue building block, termed an operational transresistance amplifier (OTRA). An operational transresistance amplifier has two low-input-impedance terminals and one low-output-impedance terminal. It is found to have a constant bandwidth independent of the gain in most closed-loop configurations. Simulation results are presented to demonstrate the constant-bandwidth performance. As an application example, this amplifier is used to implement a MOSFET-C differentiator, of which analysis and simulation results are also presented.