Oscilator using simulator bugs

Where is the limit for everycircuit with negative resistance, it does work perfect as I can see. The only limit I remember, if you stack them it might give you CFS. So what is the problem you see?

Actually, if you look at the value for the components, you can see that this feedback is in truth positive, and the natural response would be an fast exponencially growing sinusoid. The response however, is growing just a little bit. This happens because of the integration method for the simulation of reactive components, inductor and capacitor, as well because of the pass of integration used. You can think of it in terms of the Z transform of the method, withever you'd like. As you integrate, you are actually maping the S plane of the Laplace transform into the Z plane, by sampling the signal of interest. As the Z transform is limited in frequency by 2pi (after that it just keeps repeting), you cannot map the full S plane into Z plane in just 2pi, and signals of high frequency (those close to the sampling frequency) starts getting more and more distorted. In other words, generally speaking you cannot perfectly integrate numericaly, specialy when talking of signals of high frequency. If you are interested in circuits simulation you should check out Prof. Antonio Queiroz course on simulation and electric circuits, coe.ufrj.br/~acmq/cursos/. Here you can find information on how you program your own circuit simulation program (page in portuguese). Cheers

It might be.new for you, but sure you need positive feedback to get negative resistance impedance! Read that again to understand. At this point we can already stop in reading your comment, cuz if you do not even know what a negative resistance is and why it needs positive feedback, its waste of time to read your comment to the end. Why have you changed the circuit? BTW, positive feedback does not depend.on the values of components, positive feedback can be seen by topology how components are wired! If you get all this we might talk about Z plane and Laplace transformation. I dont think we will come that far.

Here your oscillator in action http://everycircuit.com/circuit/4588191901548544