WM61A Electret Microphone Model

I have built a SPICE model for the panasonic WM61A electret microphone. The model of the mic is contained in the component U1 (WM61A2) in the schematic of the test circuit to the left.

You can download this here.

This is the response at 100dbsPL with the test circuit configured as above left.
This is the distortion at 100dbsPL with the test circuit configured as above top left.
Here we replaced the 2.2k load resistor with a FET similar to the one in the WM61A to linearize the the WM61A.

 

This is the distortion at 100dbsPL with the test circuit configured as above left.
This is the distortion at 120dbsPL with the test circuit configured as above left.

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