What is Cutoff frequency?
The frequency at which the output of a filter or amplifier falls 3 dB (to about 0.707 times) below the passband. For an RC circuit it is 1/(2πRC).
Cutoff frequency in the explanations
−3 dB corresponds to about half the power, or 1/√2 ≈ 0.707 of the voltage, and filters and amplifiers use this point as the cutoff frequency (the band edge).
What does the "−3 dB" point in a filter's frequency respons…
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Related terms
1/f noise (flicker noise) Bandgap voltage reference CMRR (common-mode rejection ratio) Comparator Differential amplifier Gain-bandwidth product (GBW) Instrumentation amplifier LDO Negative feedback Operational amplifier (op-amp)