Hi everyone, I'm working with an instrumentation amplifier and I'm trying to adjust the cutoff frequencies, because I just want to amplify centain frequencies (1kHz-20kHz), this is the circuit
The circuit has a gain of 1000, this is the gain for 1mVp input signal:
I think, It has some distortion because I used the SPICE model of LM224N, but it doesn't really matters.
THE PROBLEM:
This is the frequency response of the instrumentation amplifier:
I want the amplifier have a pass band behavior with cutoff frequencies of fc1=1 kHz & fc2=22kHz.
I tried to solve it, with a high pass filter at the imput and a low pass filter at output, but it doesn't really worked.
Something like this:
And this is the result:
there are two problems, the gain has decreased and the cutoff frecuency of the Low pass filter that I solved fc=20kHz is not working.
I would be very grateful to receive any advice, thanks.
The circuit has a gain of 1000, this is the gain for 1mVp input signal:
I think, It has some distortion because I used the SPICE model of LM224N, but it doesn't really matters.
THE PROBLEM:
This is the frequency response of the instrumentation amplifier:
I want the amplifier have a pass band behavior with cutoff frequencies of fc1=1 kHz & fc2=22kHz.
I tried to solve it, with a high pass filter at the imput and a low pass filter at output, but it doesn't really worked.
Something like this:
And this is the result:
there are two problems, the gain has decreased and the cutoff frecuency of the Low pass filter that I solved fc=20kHz is not working.
I would be very grateful to receive any advice, thanks.