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active low pass filter with cutoff frequency operational amplifier, gain

Active filters differ from the common filters in that the latter are only a combination of resistors, capacitors and inductors.

In a common filter, the output is of lesser magnitude than the entry

Instead active filters consisting of resistors, active devices comoAmplificadores Operational capacitoresy otransistores.

In an active filter output can be of equal or greater in magnitude than the input.

active lowpass filter Operational Amplifier

response curve of a low pass filter.

The red dashed lines represent the ideal low pass filter

If the capacitors are selected so that:

C1 = C2 = C, R1 = R2 = R3 = R

The frequency value Fc (cutoff frequency) can be obtained using the following formula: Fc = 0.0481 / RC.

and filter gain (remember that is an amplifier) \u200b\u200bwill be: Av = Vo / Vin = R2 / R1.

If this gain is expressed in decibels: 20log Av = Vo / Vin or Av = 20 log R2 / R1.

Note: Fc (cutoff frequency) is the point in the transfer curve where output has fallen 3 dB (decibels) from its maximum value.

Mario Dominguez Zambrano

EES Section: 02