Bauteil: LTC1250

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  LowPassFilter using OpAmp

  That is impossible with single supply. The inverting amplifier has a few additional flaws. The LTC1250 is a low 1/f noise, zero-drift amplifier. Trying to cancel the effect of bias current with R4 doesn't work the same as with other generic op amps. In reality you make it worse by using R4 at all.

  The circuit works perfectly. > > > The inverting amplifier has a few additional flaws. The LTC1250 is a low > 1/f noise, zero-drift amplifier. Trying to cancel the effect of bias > current with R4 doesn't work the same as with other generic op amps. In > reality you make it worse by using

  Analog Circuits ·Ahmad K. ·2025-05-26 01:41 ·11 Replies

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  LTspice Simulation Schaltplan und Bode-Diagramm

  LowPassFilter V(vin1) V(vout2) 20dB 15dB 10dB 5dB 0dB -2dB -5dB -10dB SINE 0 100m 5 100m AC 1 R4 4.7k U1 LTC1250 R3 1k R2 10k C 0.82u Vout1 Vcc Vin1 V3 15 V(vin2) V(vout2) 20dB 15dB 10dB 5dB 0dB -2dB -5dB -10dB SINE 0 100m 5 100m AC 1 Vin4 R6 1k C2 U2 LTC1250 Vout2 C3 8.2u R5 9.09k R1 1.01k Vcc .ac dec 50 100m

  in „LowPassFilter using OpAmp“ · Analog Circuits · 2025-05-16 00:35 · Screenshots

  
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  LTspice Simulation Schaltplan und Wellenformen

  0.2V 0.1V 0.0V -0.1V -0.2V 1.0s 1.2s 1.4s 1.6s 1.8s Vcc V3 15 V1 SINE(0 100m 5 100m) AC 1 R3 1k LTC1250 U1 Vout1 R2 10k C1 0.82u V(C1)=0 C2 V(C2)=0 R6 1k U2 LTC1250 Vout2 V4 SINE(0 100m 5 100m) AC 1 C3 8.2u R7 9.09k 1.01k .ac dec 50 100 100 .tran 2

  in „LowPassFilter using OpAmp“ · Analog Circuits · 2025-05-16 00:36 · Screenshots

  
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  Schaltplan eines Operationsverstärkers

  R3 1k R4 10k LTC1250 U1 VCC 10k R2 10k C 0.82µ C1 .ic V(C1)=0

  in „LowPassFilter using OpAmp“ · Analog Circuits · 2025-05-17 05:07 · Schematics