Low-pass filtered, inverting amplifier circuit



This tunable low–pass inverting amplifier circuit amplifies the signal level by 26 dB or 20V/V. R2 and C1 set the cutoff frequency for this circuit. The frequency response of this circuit is the same as that of a passive RC filter, except that the output is amplified by the pass–band gain of the amplifier. Low–pass filters are often used in audio signal chains and are sometimes called bass–boost filters.
  • Input: Vi = -0.1 V to 0.1 V
  • Output: Vo = -2 V to 2 V
  • BW: fp = 2 kHz
  • Supply:
    • Vee = -2.5 V
    • Vcc = 2.5 V
General-purpose op amps
OPA375 OPAx375, 500uV, 10-MHz, Low Broadband Noise, RRO, Operational Amplifier TLV9002 Dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications
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Type Title Date
* Circuit design Low-Pass Filtered, Inverting Amplifier Circuit (Rev. A) PDF | HTML 05 Jan 2021
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

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