The amplifier circuit can increase the output power of a signal. It obtains energy from the power supply to control the output signal waveform to be consistent with the input signal but with a larger amplitude. In this sense, the amplifier circuit can also be viewed as a controllable output power source used to achieve a stronger output signal than the input signal.
The common-emitter amplifier circuit is a fundamental amplifier circuit. Among the three configurations of amplifiers, the common-emitter amplifier has the highest power gain but the narrowest bandwidth. The DC analysis of the amplifier uses the DC equivalent circuit, while the AC analysis uses the AC equivalent circuit. This document includes the Multisim simulation of the single-stage amplifier circuit, installation debugging, and a summary of formulas.
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