ok..... thanx for the help.... But I really need to clarify one thing... the mems mic I got from knowles acoustic is a mic with a preamp integrated with it.... which means the mic which is really small has an opamp integrated with it already..... The maximum gain that can be set for this opamp is 10..... u can check the data sheet for my opamp and its in built opamp schematic... Now that I am sure I need to dc bias and ac couple the first stage of my opamp.. I am wondering how if the first stage is already in-built in the mic without a dc bias or ac coupling.. or maybe it is set at a different dc bias and it has no ac coupling.... please can someone suggest a better way to implement a filter and amplify the signal with this mic...
Just needs an input coupling capacitor now, as the source is shorting the bias out.