Power Amplifier

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1. Characteristics of power amplifiers A power amplifier circuit is an amplifier circuit that aims to output a large power. It has the following characteristics: (1) As large an output power as possible (2) As high a power conversion efficiency as possible (3) Allowable nonlinear distortion 2. Working state of power amplifier According to the position of the static working point Q of the amplifier tube in the characteristic curve, it can be divided into the following three states, as shown in Figure 8-1. A voltage amplifier generally works in Class A, with the triode conducting 360°, and its ideal maximum efficiency is 50%. The efficiency of the amplifier circuit in the Class B working state can reach 78.5% There is a distortion problem in the Class B and Class AB working states. Push-pull circuits and complementary symmetrical circuits solve the distortion problem better.