* Question
| Application of three basic circuits of amplifier circuit and selection of its parameters |
* Answer
| The application of the three basic circuits of the amplifying circuit and the selection of its parameters The three basic circuits of the amplifying circuit are a common emitter circuit, a common base circuit, and a common collector circuit.The common emitter circuit has a high output impedance and is generally used as an intermediate stage for multistage amplification.The input resistance is large, so that the current flowing through the signal source is small; the output resistance is small, that is, the load carrying capacity is large.Input and output stages commonly used to amplify current.Common collector circuit?(should be a common base) The output impedance is high, also known as current follower, and is generally used as a high frequency or wide band circuit and a constant current source circuit.With voltage follow-up characteristics, current amplification, maximum and minimum, input and output stage common-source amplifier circuits are often used for voltage amplification, and non-current amplification with Vo is small. The frequency characteristics are best in three configurations, and are often used for broadband amplification.The selection of transistors and the selection of Resistorss and capacitors in the circuit are not particularly clear. |
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