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What is the necessity of expressing power gained by an amplifier in terms of decibels? [duplicate]

In engineering field the power gained by an amplifier i.e, the ratio of output power and input power expressed in terms of decibels i.e, $20 \log\left\lvert\frac{\text{output voltage}}{\text{input ...
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134 views

Transfer functions of active filters

I've been looking for some straightforward method or trick to obtain the transfer functions of active filters (like the Sallen-Key filter, the butterworth or Cauer topology etc...) since KCL or KVL ...
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3answers
206 views

Electronic filter

Can you explain, please, step-by-step how an electronic filter does work? For example, high pass filter. I know It's a trivial things, but I can't get it completely. Don't bring me formula and etc. ...