engr_joni_ee
Advanced Member level 3
I have a small signal of -10 mV. I need to amplify it to 4 V which need an amplification factor of 400. I would like to use inverting amplifier whose gain is R2/R1, where R2 is a feedback resistor. I am wondering what is the best practice to get the amplification by a factor of 400.
1- Use one OpAmp to get gain 400. R1 = 100 , R2 = 40 K.
2- Use two OpAmp in series. Each with a gain of 20. R1 = 500, R2 = 10 K.
1- Use one OpAmp to get gain 400. R1 = 100 , R2 = 40 K.
2- Use two OpAmp in series. Each with a gain of 20. R1 = 500, R2 = 10 K.