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Series RC in feedback path of LPF

vinay bhatt
Prodigy 240 points


What is the purpose of connecting series RC (Resistor and Capacitor) in feedback path of Low Pass Filter using inverting amplifier  i.e R parallel C parallel (R series C)?

  • 0
    TI__Mastermind 27680 points

    Hi Vinay,

    What a strange circuit. 

    A reason you would put a capacitor and resistor in series in the feedback path is to have a lot gain in low frequencies. This high gain will decrease quickly as you go up in frequency. However, this R+C path added to the traditional active lowpass filter circuit seems a little pointless. The gain is now set by R3 in low frequencies and having both of these feedback paths doesn't increase the order of the filter. 

    Did you see this circuit somewhere, were you wanting to build a bandpass filter, or is there another reason you want to know about this specific circuit? 

    Best Regards, 

    Robert Clifton