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Sun Dec 26 13:10:45 EST 2010

Current conversion, frequency feedback

Problem: building a lin -> exp converter to be used in an oscillator
requires temperature stabilization.  It might be simplest to do this
closed-loop.  However, this requires a large resolution.

The only large resolution available on a cheap uC is time, so it might
be a good idea to convert the output current to a variable frequency
circuit: i.e. to add a relaxation oscillator to each exp output circuit.

Questions: 

 - The exp converter current is most likely used to set the bias
   current in a differential pair.  How much voltage can we use and
   does this feed through to the signal (CMRR?).

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