Cascaded high-gain active low-pass filter reference design for high-impedance applications
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Key Document


This design uses an OPA2810 high-speed amplifier to provide two multiple feedback (MFB) low-pass filter boards with 1 MHz cutoff frequencies. The fourth-order board, provides a fourth-order filter with high gain and steep roll-off. The high-impedance board (High-Z), is a second-order filter meant for systems with a large output impedance in the previous stage. Both boards in this reference design offer engineers a high-gain, wide supply range filter with a focus on minimizing noise and distortion.

  • Cascaded low-pass filter to achieve a gain up to 40 dB and a cutoff frequency of 1 MHz
  • Multiple feedback topology for fourth-order and second-order designs
  • Compact two-stage design for high gain second or fourth-order filters
  • Minimal overshoot and ringing resulting from high stability
  • Low-distortion and low-noise design
  • Uses the JFET-input OPA2810 for low input noise, high common mode rejection ratio (CMRR), and fast slew rate
  • Supports wide supply voltage range and high output voltage designs

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Schematic/Block Diagram

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Design Files

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA2810  Dual channel, high performance, 27 V, 105 MHz, RRIO FET input op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA2810 Download Download
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Technical documentation

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Data sheet (1)
Title Type Size (KB) Date
PDF 2997 11 Feb 2020
User guide (1)
Title Type Size (KB) Date
PDF 1353 26 Sep 2019
Design files (6)
Title Type Size (KB) Date
ZIP 1776 01 Mar 2019
ZIP 1455 01 Mar 2019
PDF 253 01 Mar 2019
ZIP 170 01 Mar 2019
ZIP 95 01 Mar 2019
ZIP 208 01 Mar 2019

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