ODP: thru zero VCO questions

[Martin Czech]

I've got two objections:

-I can not see how the oscillation will be stable, the toggle ff could
be in the wrong state right from the start, or get into a wrong state
later on due to noise or metastability. Then the direction switch will
not work any longer, since the cap is integrated near to one power rail
and get stuck there.

-I can not see what advantage it should have using the nonlinear
OTA input for more then a polarity digital signal. The linear fm signal
will be distorted or drown in noise, and using the diff. input in "linear"
mode will cause offset problems, too.


m.c.