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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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Supported products & hardware
General-purpose op amps
Precision op amps (Vos<1mV)
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Circuit design | Single-supply, 2nd-order, multiple feedback low-pass filter circuit | PDF | HTML | 28 Jun 2021 |
| E-book | Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. C) | 18 Dec 2023 | ||
| Application note | Active Low-Pass Filter Design (Rev. D) | PDF | HTML | 02 Feb 2023 | |
| E-book | Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) | 05 Oct 2022 | ||
| Application note | Compensation Methodology for Error in MFB Low-Pass Filter, Caused by Limited GBW | 04 Aug 2017 | ||
| Application note | Design Methodology for MFB Filters in ADC Interface Applications | 23 Feb 2005 | ||
| Application note | More Filter Design on a Budget | 06 Dec 2001 |
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