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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Here’s a circuit that should bunba work, using a quad LT and a single power supply rail: Set more time for the simulation. Take a couple of zener diodes connected in series having the anodes against each other. Bimpelrekkie – that is not the case.

Circuit Collection : Oscillators

So the solution to your problem is: Sign up or log in Sign up using Google. It has started to oscillate. The amplitude does not grow any more to infinity. I suggest reading about the Barkhausen stability criterion. The only property which is important is an amplitude limitation due to the power supply rails.


And that means the loopgain becomes smaller. Home Questions Tags Users Unanswered. This below is my circuit: For the Bubba oscillator this is the case. In control theory they call it PI controller. Here’s the output from LTSpice: Insert that limiting circuit in parallel with one of the capacitors.

You should be able to replicate similar results in oscillatoe own simulator. And that will result in a stable amplitude. Zoomed result Simulated for 10sec: I have seen in practical circuits even a NTC resistor used here.

This is not a good solution if you need low distortion sinewave. After setting sec as simulation time, the amplitude goes to infinity and at around 51 sec, Derivative of state at time Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

This effect cannot be found in the literature.

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These opamps cannot generate infinite voltages so at some voltage their output voltage will be less than what you would ideally expect. No I do mean finite gain opamps, but try it and see if it helps, it won’t.


I have the design file I can upload. How to achieve a pure sinusoidal waveform from this bubba oscillator What you see is the oscilator starting.

bubba oscillator

It needs a voltage contolled component which has variable gain, attenuation or resistance. Where did i go wrong? The amplitude grows exponentially. Sorry, i am quite new at electronics The problem is that i am not able to generate the sinusoidal from the osciklator. But this will probably result in a distorted sinewave.

Sine generator – Bubba Oscillator Ask Question. If you zoom in on the left side you should also see the oscillation but at a much smaller amplitude. And this below is my result Simulated for 10sec: In the article about the Bubba oscillator the author uses real opamps.

Just to add yet another post on this.