Transistor static operating point

QWE4562009

Transistor static operating point [Copy link]

Transistor static operating point--------If the static operating point is not set properly, saturation distortion (static operating point is too high) or cutoff distortion (static operating point is too low) may occur when amplifying the AC signal .----------I don't understand the specific meaning of saturation distortion and cutoff distortion. What is no distortion like? Who can describe it in a vivid way? Thank you

maychang

模拟电子技术基础 童诗白 第四版 651页 24.5M 高清书签版.pdf (24.77 MB, downloads: 450)

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This problem is more clear and simple to explain with a diagram. See the book above, starting from page 85.

jomerwj

Also learn about analog electronics

QWE4562009

maychang posted on 2018-12-20 15:16 This problem is clearer and simpler to explain with a diagram. See the book above, starting from page 85.

This kind of tedious calculation textbook is useless for application

maychang

QWE4562009 posted on 2018-12-27 08:33 This kind of tedious calculation teaching material is useless for application

So forget it.

hk6108

Beheading and cutting off feet

Fred_1977

Saturation distortion (static operating point is too high): that is, the base bias current is set too large. When the input signal is large, the top of the waveform will be clipped. Cut-off distortion (static operating point is too low): that is, the base bias current is set too small. When the input signal is small, the waveform will be distorted.

QWE4562009

Fred_1977 posted on 2022-5-17 20:04 Saturation distortion (static operating point is too high): that is, the base bias current is set too large. When the input signal is large, the top of the waveform will be clipped. & ...

How to set the base current?

gmchen

I have a post specifically about this issue:

https://en.eeworld.com/bbs/thread-1193015-1-1.html

However, there are also "tedious calculations" in it. If the OP thinks it is "useless", even if I didn't say it,

Fred_1977

The simplest method is to adjust the bias resistor Rb. When saturation distortion occurs, Rb can be increased. Similarly, if cutoff distortion occurs, Rb can be reduced.