The Letter describes the design of a versatile analogue building block, termed an operational transresistance amplifer (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 indpendent 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.
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Chen et al. (1992) studied this question.
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