Amplifier gain exploration: Technical or structural means of enhancing the gain of an amplifier

Abstract. The primary function of an amplification circuit is to amplify the input dynamic signal without distortion. Therefore, there is aproportional relationship between the output and input signals, which is referred to as gain. Gain, the ratio of output voltage to input voltage, is a crucial performance metric for amplifiers and plays a vital role in electronic circuits. Amplifiers are now an indispensable part of various fields. Amplifier circuit structures vary widely, and different amplification circuits are used in different applications and fields due to their unique advantages and inevitable drawbacks. Practically, it is necessary to maximize strengths and minimize weaknesses by sele cting the most suitable amplification circuit. This paper analyzes several typical structural methods for enhancing amplifier gain and discusses the advantages and disadvantages of each structure. Through theoretical derivation and Cadence software simulation, it is demonstrated that the cascode, five-transistor OTA structure, and cascade structure play important roles in achieving circuit gain.