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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Surprisingly, such a “hard-limiting” will cause only a slight distortion because the loop will adjust itself to a loop gain of unity. So the solution to your problem is: The only property which is important is an amplitude limitation due to the power supply rails. 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.

This is the error message. So sorry to bug you, i am using MATLAB b, can you upload bkbba file in previous version if thats not much trouble, if not, never mind. And this below is oscil,ator result Simulated for 10sec: Your misconception comes from the fact that you first have to understand the theory of operation of oscillators.

Take a couple of zener diodes connected in osci,lator having the anodes against each other. For the Bubba oscillator this is the case. This effect cannot be found in the literature. Sign up using Email and Password.

Unfortunately I havent Matlab nor Simulink, only washy low-cost imitations, but it works there. What you see is the oscilator starting. In the article about the Bubba oscillator the author uses real opamps.


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

Just to add yet another post on this. This is what is causing an exception Sign up or log in Sign up using Google. It has started to oscillate. This is not a good solution bbba you need low distortion sinewave.

By real op-ampsdo you mean finite gain op-amp? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

This below is my circuit: The amplitude grows exponentially. Such an oscillator with real opamps will stabilise its signal amplitude on the point where the loopgain is precisely one. How to achieve a pure sinusoidal waveform from this bubba oscillator The problem is that i am not able to generate the sinusoidal from the circuit. I have the design file I can upload. Here’s a circuit that should actually work, using a quad LT and a single power supply rail: Where did i go wrong? Set more time for the simulation.

This states that an oscillator oscillates when the loopgain is more than 1. Here’s the output from LTSpice: That would be gr Post as a guest Name. If you oscillaror in on the left side you should also see the oscillation but at a much smaller amplitude.

I have seen in practical circuits even a NTC resistor used here. Simulation is stopped when some current, voltage or internal variable reaches the limit of the available number range. The simulation will be stopped. In control theory they call it PI controller. The amplitude does not grow any more to infinity.


It does oscllator, you can see that it does on the right side of the plot. And that will result in a stable amplitude.

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Sorry, i am quite new at electronics Bimpelrekkie – that is not the case. Home Questions Tags Users Unanswered. Sine generator – Bubba Oscillator Ask Question.

What is needed is a limitation on the output voltage. This is not that easy to model I know, I have tried.

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Zoomed result Simulated for 10sec: 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. I suggest reading about the Barkhausen stability criterion. And that means the loopgain becomes smaller. 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.

No I do mean finite gain opamps, but try it and see if it helps, it won’t. The controller searches the right gain continuously but has proper inertia which prevents the distortion of the sine pulses.