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CIRCUIT060012

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

CIRCUIT060012

Overview

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).
Features
  • 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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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. D) PDF | HTML Sep 24, 2024
Application note Active Low-Pass Filter Design (Rev. D) PDF | HTML Feb 2, 2023
Application note Compensation Methodology for Error in MFB Low-Pass Filter, Caused by Limited GBW Aug 4, 2017
Application note Design Methodology for MFB Filters in ADC Interface Applications Feb 23, 2005
Application note More Filter Design on a Budget Dec 6, 2001

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