May 3, 2020 0 Comments

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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So sorry to bug you, i am using MATLAB b, can you upload the file in previous version if thats not much trouble, if not, never mind.

This effect cannot be found in the literature. It needs a voltage contolled component which has variable gain, attenuation or resistance.

op amp – Sine generator – Bubba Oscillator – Electrical Engineering Stack Exchange

This is what is causing an exception By real op-ampsdo you mean finite gain op-amp? It does oscillate, you can see that it does on the oscillatof side of the plot.

So the solution to your oscillatod is: How to achieve a pure sinusoidal waveform from this bubba oscillator Simulation is stopped when some current, voltage or internal variable reaches the limit of the available number range. This is not a good solution if you need low distortion sinewave.


Where did i go wrong? I suggest reading about the Barkhausen stability criterion.

Post as a guest Name. For the Bubba oscillator this is the case. But this will probably result in a distorted sinewave. The only property which is important is an amplitude limitation due to the power supply rails. These opamps cannot generate infinite voltages so at some voltage their output voltage will be less than what osillator would ideally expect. And this below is my 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.

Here’s the output from LTSpice: Better would be to use a tanh x like function so that it limits but in a continous way. Set more time for the simulation. The amplitude grows exponentially. However when the loopgain remains higher than 1 the amplitude of the oscillation will pscillator and keep increasing.

The controller searches the right gain continuously but has proper inertia which prevents the distortion of the sine pulses.

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Sine generator – Bubba Oscillator Ask Question. The problem is that i am not able to generate the sinusoidal from the circuit. Sign up or log in Sign up using Google. No I do mean finite gain opamps, but try it and see if it helps, it won’t.


bubba oscillator | All About Circuits

Here’s a circuit that should actually work, using a quad LT and a single power supply rail:. Take a couple of zener diodes connected in series having the anodes against each other. Home Questions Tags Users Unanswered.

You should be able to replicate similar results in your own simulator. Sign up using Email and Password. And that will result in a stable amplitude. Your misconception comes from the fact that you first have to understand the theory of operation of oscillators. This is the error message.

In the article about the Bubba oscillator the author uses real opamps. Bimpelrekkie – that is not the case. I have the design file I can upload. You have used ideal opamps I suspect and that means that the amplitude of the oscillation will increase and keep increasing. In control theory they call it PI controller.

Unfortunately I havent Matlab nor Simulink, only washy low-cost imitations, but it works there.