[Contents] 1 The composition and working principle of the basic amplifier circuit 2 Analysis methods of amplifier circuits 3 Common collector circuit and common base circuit 4 Multi-stage amplifier circuit and combined amplifier circuit 5 Frequency characteristics of amplifier circuit 6 Examples of amplifier circuit design The composition of amplifier circuits In production practice and scientific research, amplifier circuits are needed to amplify weak signals for observation, measurement and utilization. A basic amplifier circuit must have the following components: input signal source, transistor, output load, DC power supply and corresponding bias circuit. Among them, the DC power supply and the corresponding bias circuit are used to provide a static operating point for the transistor to ensure that the transistor works in the amplification area. For bipolar transistors, it is to ensure that the emitter junction is forward biased and the collector junction is reverse biased. The input signal source is generally a transducer that converts non-electrical quantity into electrical quantity, such as various sensors, microphones that convert sound into electrical signals, and video cameras that convert images into electrical signals. The voltage signal or current signal it provides is the input signal of the basic amplifier circuit. The figure is the circuit schematic diagram of the simplest common emitter configuration amplifier. 1) Transistor V 2) DC power supply UCC 3) Base bias resistor Rb 4) Collector resistor Rc 5) Coupling capacitors C1, C2
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