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CIRCUIT060051

Fast-settling low-pass filter circuit

CIRCUIT060051

Overview

This low-pass filter topology offers a significant improvement in settling time over the conventional single pole RC filter. This is achieved through the use of diodes D1 and D2, that allow the filter capacitor to charge and discharge much faster when there is a large enough difference between the input and output voltages.
Features
  • Input: Vi = -12 V to 12 V
  • Output: Vo = -12 V to 12 V
  • Supply:
    • Vcc = 15 V
    • Vee = -15 V
  • Cutoff frequency: 10 kHz
  • Diode threshold voltage: 20 mV
Precision op amps (Vos<1mV)
OPA827 — Low-noise, high-precision, JFET-input operational amplifier
General-purpose op amps
TLC072 — Dual, 16-V, 10-MHz, 100-mA output current operational amplifier
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Technical documentation

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Type Title Date
* Circuit design Fast-settling low-pass filter circuit 09 Jan 2019
Application note Basic Introduction to Filters - Active, Passive, and Switched-Cap (Rev. A) 21 Apr 2010
Application note More Filter Design on a Budget 06 Dec 2001
Application note Fast Settling Low-Pass Filter 27 Sep 2000

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