Quadrature Oscillator with TLV2474

Posted on Feb 6, 2014

I did some quick playing with the circuit. It is very close to sustaining oscillation. Changing R2 to 10. 5k will cause it to sustain oscillation. The original authors of the note that you reference are no longer with TI so we cannot consult with them. Oscillators of this type can be tricky and there is a tradeoff between providing enough gain to o

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scillate and overloading into strong distortion. This circuit would probably require optimization with a nonlinear element to better control the feedback for reliable performance. You mean like the lamp in Hewlett`s Wien Bridge Oscillator I was actually hoping to get around something like this. Maybe a pot and a little fiddling with the tuning could make it work as well I`ll try to set this up with real elements some time soon and see if it works. Sorry to reopen this thread, but I have been thinking about what you said about non-linear feedback and have placed two Zener diodes in the feedback loops of both amps. Without the diodes the output voltages run against the rails and clip but with them the output becomes a pure sine/cosine wave. However this does not work for 5 V supply which I assume is due to the breakdown voltages of the diodes. I am posting this partly to share it with anyone who might want to do something similar in the future and partly to ask if anyone sees any pitfalls or redundancies I overlooked. All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and...

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