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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It does oscillate, you can see that it does on the right side of the plot. Surprisingly, such a “hard-limiting” will cause only a slight distortion because the loop will adjust bugba to a loop gain of unity.

This is the error message. However when the loopgain remains higher than 1 the amplitude of the oscillation will increase and keep increasing.

And that will result in a stable amplitude. What is needed is a limitation on the output voltage.

Zoomed result Simulated for 10sec: This below is my circuit: How to achieve a pure sinusoidal waveform from this bubba oscillator It has started to oscillate. Bubbx up using Facebook. These opamps cannot generate infinite voltages so at some voltage their output voltage will be less than what you would ideally expect.

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Sine generator – Bubba Oscillator Ask Question. This is not that easy to model I know, I have tried.

bubba oscillator

Your misconception comes from the fact that you first have to understand the theory of operation of oscillators. Oscillatr is stopped when some current, voltage or internal variable reaches the limit of the available number range. A drastic improvement reduction of distortion osfillator 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.

Such an oscillator with real opamps will stabilise its signal amplitude on the point where the loopgain is precisely one.

Bubba Oscillator – CircuitLab

Set more time for the simulation. For the Bubba oscillator this is the case. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. This effect cannot be found in the literature.

And this below is my result Simulated for 10sec: It needs a voltage contolled component which has variable gain, attenuation or resistance. I suggest reading about the Barkhausen stability criterion. This is oscilator is causing an exception So the solution to your problem is: Trevor Yeah, strangely enough this oscillator relies on the non-ideal properties of the opamps.


A good analog sinewave oscillator has a specially designed contol circuit which checks the output amplitude and reduces the gain until output amplitude is the wanted. Insert that limiting circuit in parallel with one of the capacitors.

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By real op-ampsdo you mean finite gain op-amp? You have used ideal opamps I suspect and that means osvillator the amplitude of the oscillation will increase and keep increasing.

If you zoom in on the left side you should also see the oscillation but at a much smaller amplitude. The simulation will be stopped. After setting sec as simulation time, the amplitude goes to infinity and at around 51 sec, Derivative of state at time No I do mean finite gain opamps, but try it and see if it helps, it won’t. I have seen in practical circuits even a NTC resistor used here.