Fast-settling low-pass filter circuit



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.
  • 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 Jan. 09, 2019
Application note Basic Introduction to Filters - Active, Passive, and Switched-Cap (Rev. A) Apr. 21, 2010
Application note More Filter Design on a Budget Dec. 06, 2001
Application note Fast Settling Low-Pass Filter Sep. 27, 2000

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