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When the output voltage waveform of triode is sine wave, top distortion and bottom distortion appear at the same time. What's going on here?
Waveform distortion is that the output waveform of the amplifier circuit cannot reproduce the input waveform, that is, the waveform is out of shape. There are many reasons for the waveform distortion of amplifier circuit, such as improper selection of static operating point, environmental temperature change, transistor aging, unstable power supply voltage and so on.

In order to avoid the distortion of the output waveform of the amplifier circuit, measures should be taken to stabilize the static operating point in addition to selecting the appropriate static operating point, so the negative feedback bias circuit with stable operating point is usually selected. The output waveform distortion of amplifier circuit caused by unstable power supply voltage and aging lamp tube can be solved by stabilizing voltage or replacing transistor.

Extended data:

Precautions:

When using patch transistor, we should pay attention to the influence of bypass capacitance on voltage gain. As shown above, due to the existence of this bypass capacitor, different situations will occur in different frequency environments.

When using patch transistor, we should pay attention to the influence of junction capacitance inside the transistor. Due to the semiconductor manufacturing process, there must be a certain junction capacitance inside the patch transistor. When the input signal frequency reaches a certain level, the amplification effect of the patch transistor will be greatly reduced.

When using triode, we should clearly grasp the cutoff frequency of triode, and pay attention to reliability when using as switch.

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