Low-Cost Alternative to a Function Generator: The Bubba Oscillator by Phillip Johnston. 4 March Introduction. When testing the functionality of a circuit or . Bubba Oscillator. 0. Favorite. 4. Copy. Views. Open Circuit. Bubba Oscillator. Social Share. Circuit Description. Graph image for Bubba Oscillator. Solved: Hi there. I’m trying to make a sine wave inverter based on “Bubba Oscillator”. The output of the bubba oscillator is a nice sine.

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A drastic improvement reduction of distortion is possible when we use two different supply rail voltage pairs and when the ouput is taken from the block with the larger supply voltage limiting effect in the block with smaller supply voltages.

In control theory they call it PI controller. Simulation is stopped when some current, voltage or internal variable reaches the limit of the available number range. The only property which is important is an amplitude limitation due to the power supply rails.

But this will probably result in a distorted sinewave. If you zoom in on the left side you should also oscilator the oscillation but at a much smaller amplitude. Here’s the bubbaa from LTSpice: That’s what your plot shows. Take a couple of zener diodes connected in series having the anodes against each other. Home Questions Tags Users Unanswered.

And this below is my result Simulated for 10sec: After setting sec as simulation time, the amplitude goes to infinity and at around 51 sec, Derivative of state at time This below is my circuit: It needs socillator voltage contolled component which has variable gain, attenuation or resistance.


The controller searches the right gain continuously but has proper inertia which prevents the distortion of the sine pulses. However when the loopgain remains higher than 1 the amplitude of the oscillation will increase and keep increasing.

Bubba Oscillator – CircuitLab

Sine generator – Bubba Oscillator Ask Question. What happens after that So the solution to your problem is: Post as a guest Name. Sign up using Facebook. This effect cannot be found in the literature. And that means the loopgain becomes smaller. You have used ideal opamps I suspect and that means that the amplitude of the oscillation will increase and keep increasing.

This is the error message. I have the design file I can upload. No I do mean finite gain opamps, but try it and see if it helps, it won’t.

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Email Required, but never shown. This states that an oscillator oscillates when the loopgain is more than 1. Better would be to use a tanh x like function so that it limits but in a continous way. I have seen in practical circuits even a NTC resistor used here.

How to achieve a pure sinusoidal waveform from this bubba oscillator It has started to oscillate. What is needed is a limitation on the output voltage.

Your misconception comes from the fact that you first have to understand the theory of operation of oscillators. This is not that easy to model I know, I have tried. In the article about the Bubba oscillator the author uses real opamps.


The simulation will be stopped.

bbuba Zoomed result Simulated for 10sec: Surprisingly, such a “hard-limiting” will cause only a slight distortion because the loop will adjust itself to a loop gain of unity. The amplitude grows exponentially.

That would be gr This is what is causing an exception Set more time for the simulation. Sorry, i am quite new at electronics Sign up using Email and Password. What you see is the oscilator starting.

Bimpelrekkie – that is not the case. Just to add yet another post on this. For the Bubba oscillator this is the case. These opamps cannot generate infinite voltages so at some voltage their output voltage will be less than what you would ideally expect. The amplitude does not grow any more to infinity. By real op-ampsdo you mean finite gain op-amp? Where did i go wrong? It does oscillate, you can see that it does on the right side of the plot.

Trevor Yeah, strangely enough this oscillator relies on the non-ideal properties of the opamps.