Cascode-based voltage-Amplifier stage

Abstract

Voltage-Amplifier stages are the basic components of commonly used high gain amplifiers the bias and other parameters of whose are set by the external negative feedback. The typical device that uses the voltage-Amplifier stage is the operational amplifier. Similar constructions can also be created on the basis of discrete transistors. From the circuit designer's point of view, the voltage-Amplifier stage defines the crucial parameters of the whole unit-the amplification factor, dominant pole of its transfer function and the slew rate. In this paper the proposal on construction of the voltage-Amplifier stage based on discrete transistors is described. When connected between the input differential amplifier and the output stage, it allows creating of cheap amplifier for HiFi applications with considerable performance. © The Authors, published by EDP Sciences, 2017.