What is the purpose of setting a static operating point?

The purpose of setting the static operating point is to ensure that when the amplified AC signal is added to the circuit, both the positive half cycle and the negative half cycle can satisfy the forward bias of the emitter junction and the reverse bias of the collector junction. Zoom state.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The purpose of setting the static operating point is to ensure that when the amplified AC signal is added to the circuit, both the positive half cycle and the negative half cycle can satisfy the forward bias of the emitter junction and the reverse bias of the collector junction. Zoom state.

The static operating point refers to the triode amplifier circuit. The triode static operating point means that when the AC input signal is zero, the circuit is in a DC operating state. These current and voltage values ​​can be represented by a certain point on the BJT characteristic curve. , this point is customarily called the static operating point Q.

Extended information:

The role of the static operating point:

Determine the static values ​​of the voltage and current of the amplifier circuit

Selecting an appropriate static operating point can prevent the circuit from generating nonlinear distortion. Ensure a better amplification effect

Determination of static operating point:

The static operating point is the intersection point of the DC load line and a certain output characteristic curve of the transistor. The static operating point moves up and down along the DC load line with different IB.

According to the formula Uce=Ucc-RcIc, draw the DC load line on the Ic/Ucc diagram, and then draw the transistor output characteristic curve under IB. The intersection point is the static operating point.

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