Single-supply, 2nd-order, multiple feedback low-pass filter circuit




The multiple-feedback (MFB) low-pass filter (LP filter) is a second-order active filter. Vref provides a DC offset to accommodate for single-supply applications. This LP filter inverts the signal (Gain = –1 V/V) for frequencies in the pass band. An MFB filter is preferable when the gain is high or when the Q-factor is large (for example, 3 or greater).
  • Single 5-V supply
  • Input: +/-2.45 V
  • Output: 50 mV to 4.95 V
  • Cutoff frequency: 10 kHz
  • Gain: -1 V/V

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Simulation file for Low-Pass MFB Filter Circuit SBOC597.TSC (67KB)

Supported products & hardware

Supported products & hardware

General-purpose op amps
TLV316 Single, 5.5-V, 10-MHz, RRIO operational amplifier TLV9062 Dual, 5.5-V, 10-MHz operational amplifier
Precision op amps (Vos<1mV)
OPA325 Low noise (10nV/rtHz), wide bandwidth (10MHz), low power (0.65mA), zero crossover op amp

Technical documentation

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Type Title Date
* Circuit design Single-supply, 2nd-order, multiple feedback low-pass filter circuit PDF | HTML Jun. 28, 2021
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
Application note Compensation Methodology for Error in MFB Low-Pass Filter, Caused by Limited GBW Aug. 04, 2017
Application note Design Methodology for MFB Filters in ADC Interface Applications Feb. 23, 2005
Application note Active Low-Pass Filter Design (Rev. B) Sep. 13, 2002
Application note More Filter Design on a Budget Dec. 06, 2001

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