Transistor low frequency amplifier circuit

Crystal oscillator

DFN1006 TP-RCLAMP3321P ESD Diode Low Capacitance

The following is the circuit diagram of [Transistor Low Frequency Amplifier Circuit]

Transistor low frequency amplifier circuit

Transistor low frequency amplifier is mainly used to amplify low frequency small signal voltage, the frequency is from tens of Hz to one hundred kilohertz

First, the bias circuit of the transistor

Second, the three forms of the amplifier The amplifier is a three-terminal circuit, in which one end must be the common "ground" end of the input and output. If the common "ground" is connected to the emitter, it is called the common-emitter circuit and is connected to the collector. For the common circuit, connected to the base, called the common base circuit, these three have different performance, see the following table.

Third, the graphic method

The so-called graphic method is to use the characteristic curve of the input and output of the transistor to analyze the performance of the amplifier by mapping. The graphic method can intuitively and comprehensively indicate the working process of the triode amplification, and can calculate some performance indexes of the amplifier. An example to illustrate the graphical process of the graphical method, Example: It is known that the parameters in the circuit below and the input voltage Ui=15sinωt (millivolts) require graphical determination of the static operating point parameters Ibq, Icq, Iceq of the circuit, and calculation of the voltage and current amplification factors Ku, Kio.

(Editor: Circuit Diagram)

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