On Thu, May 10, 2012 at 05:41:15PM +0800, Shawn Guo wrote:

The "Mic Bias" here is really a SGTL5000 internal supply.

If it is then what's providing the bias to the mic?  It's common for
chips to have a micbias supply which comes out of the chip and is used
by mics, this is my understanding of what this circuit is.
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