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Why does the gain increase when the frequency of the input signal of the amplifier circuit is low or high?

Hardware design
June 29, 2020 by Tsai Bruce 177

In the circuit test, it is found that when the frequency of the input signal is low or high, the gain will rise instead. What is the situation?

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ray Posted on June 29, 2020

It is not possible to do the pre-level input. Check how others designed the pre-level input. The input processing capacitor should be removed and the resistor divider ratio can be used to improve the current effect.

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