Satya,
It all are depends to the mic quality & pre-amp design. While selecting a microphone you need to consider good frequency response, impedance of the mic(low imp is good), directional property, sensitivity, etc...., If you select an audio opamp like TI OPA series & if the pre amp section is properly designed(to respond all frequency), then you can get very good output.
We have some dedicated mic preamp like MAX4063, MAX9814, etc...,
Look this....
https://www.microsyl.com/index.php/2010/03/29/very-high-gain-microphone/
**broken link removed**
We need to provide bias current for microphone to operate. Its a simple pullup resistor but the value will vary with impedance of the mic or bias current, etc...,
- - - Updated - - -
Satya,
It all are depends to the mic quality & pre-amp design. While selecting a microphone you need to consider good frequency response, impedance of the mic(low imp is good), directional property, sensitivity, etc...., If you select an audio opamp like TI OPA series & if the pre amp section is properly designed(to respond all frequency), then you can get very good output.
We have some dedicated mic preamp like MAX4063, MAX9814, etc...,
Look this....
http://www.microsyl.com/index.php/2010/03/29/very-high-gain-microphone/
http://sound.westhost.com/project66.htm
We need to provide bias current for microphone to operate. Its a simple pullup resistor but the value will vary with impedance of the mic or bias current, etc...,