[sdiy] Spice model for CA3080 OTA

[Neil Johnson]

Hi,

Carsten Toensmann wrote:
> It sometimes happens in the OTA based VCF of my Formant modular system. The
> filter "crashes" and has to be "rebooted".

Yes, that's been known about for some time:

http://www.muffwiggler.com/forum/viewtopic.php?t=37888

> Perhaps the OTA shuts down if the controll current reaches a certain level,
> without being destroyed. So a test with a higher resistance in the control
> current might help.

No, it is due to op-amp phase reversal.

Neil
--
http://www.njohnson.co.uk