Operational transresistance amplifier using CMOS technology

TLDR

An operational transresistance amplifier has two low‑input‑impedance terminals and one low‑output‑impedance terminal. The Letter presents the design of a versatile analogue building block, the operational transresistance amplifier (OTRA). The OTRA is implemented in CMOS and demonstrated by applying it to a MOSFET‑C differentiator, with analysis and simulation results provided. The OTRA exhibits a constant bandwidth independent of gain in most closed‑loop configurations, as confirmed by simulation and by its performance in the MOSFET‑C differentiator example.

Abstract

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.