Hello,
My application is to amplify the 1mV order mic electret capsule signal of bandwidth 20Hz to 22kHz in a gain of 1000.
The mic and the whole circuit are required to biased by the resistor with a 3V supply voltage, so INA331 is chosen for this application.
Is the attachment circuit correctly use of INA311? Or any modification is required? If I use the configuration given in the attachment, how small the noise value be calculated & evaluated and required using this voltage reference(Vref) IC that I should choose? could you please suggest the voltage reference suitable for this application?
The R in the figure may vary from 1k to 11k depending on the different brand of mic.
Thank you very much in advance for any expertise advices, comments and feedback.
