These -3dB corner frequency points define the frequency at which the output gain is reduced to 70.71% of its maximum value . Then we can correctly say that the -3dB point is also the frequency at which the systems gain has reduced to 0.707 of its maximum value.
Read moreWhat is corner frequency of low pass filter?
5.3.1 Low-Pass Filter The point at which frequencies stop getting passed and start getting attenuated is known as the corner frequency. The corner frequency is the point where the output voltage is 70.7% of the input voltage ie. (0.707 × VIN ). This point is sometimes called the ‘cutoff frequency’ or the ‘-3dB’ point.
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