thru zero VCO questions

[Rene Schmitz]

At 15:08 09.09.99 +0200, you wrote:

>You still have some switching, don't you, but you keep it outside the main
>VCO loop, and only swich the polarity of the modulation signal instead. (?)

There is only one switch.(It could simply switch between the OTAs + and -
inputs) This switching is what closes the VCO loop. I think it'll work.
Assumed there is only a dc FM signal, there is the same action as in a
integrator/schmitt trigger oscillator. But this works for either
polarities. For zero input the integrator stops (or almost). 


>I wonder if you really need a flipflop and the pulse / toggle stuff. The
>input
>of the OTA already carries your up/down information. 

Yes but only because it is switched from the output of the FF!

One has to use perhaps a mechanism to prevent the locking conditions.
I hope to find the time soon to try it out.

Bye
 René



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