Ultrasonic MEMS microphone Receiver Amplifier/filter

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Dino1400

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Hello All,

I'm trying to design a Ultrasonic Receiver, I have used one of the comment circuit available online. I'm having an issue of swing; the output looks amplified but doesn't really swing rail to rail or at least around zero. I have attached the circuit and the simulations. I should be amplifying and and filtering ( center frequency 40KHz).

Thank you in advance





 

hi,
You say its a 20kHz to40kHz BP filter, but your signal source is set to 4kHz.???
E
 

The second stage is a second order band pass filter has a center frequency of 20KHz and a band with of 26KHz.
 

hi,
Unless I am misreading your circuit, you are using a 4000Hz signal source.
This is well outside the pass band.??
E
 

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