A Study of Techniques to Increase Amplifier Gain

Abstract. Improving amplifier gain has been one of the key topics in electronics. Although many techniques or structures have been created to increase amplifier gain, the increase in gain largely leads to changes in other parameters such as stability and bandwidth. Therefore, the aim of this paper is to investigate basic common-source amplifiers, common-source common-gate structures and current cancellation techniques, a total of five basic circuit structures for increasing amplifier gain, and to compare and analyse them based on some of their parameters. This paper uses a combination of theoretical derivation and simulation and experimental verification to carry out the study. Finally, the advantages and disadvantages of each structure as well as the application scenarios and development prospects are listed. Through this paper, researchers can not only have a basic understanding of the above structures, but also have a more intuitive understanding of the design of amplifiers as a multi-dimensional optimisation problem. It is essential to design the right amplifier for different circuit requirements.