How to create a VCO with OPV?

Martin Dickhoff

Hello,

I have a similar Problem with TINA. I try to simulate a VCO to generate a FM-Signal. I have to use a VCO for it, But I can't simulate it. If I realize it at the Analog System Lab Kit Pro, the VCO works but I don't get a perfect FM Signal.

In the Simulation there is an error you can see in the Picture.

I hope you can Help me, because I really need it.

best regards

Martin

over 12 years ago

0 Britt Brooks - Online Design Tools over 12 years ago

TI__Mastermind 41310 points

Martin,

Can you provide the TINA .TSC file for the design? The first listed error is for a capacitor without a path to ground. Simply change the shunt capacitance to 1p in the Analysis--> Set Analysis Parameters (default is 0). I am not sure what the other error is, but it appears to be internal to the U1 subcircuit.

Without the .TSC file, it is nearly impossible to tell what is actually happening.

Britt

0 Martin Dickhoff over 12 years ago in reply to Britt Brooks - Online Design Tools

Prodigy 60 points

Hey Britt,

thanks for your answer I can't fix it, but I can give you the .TSC file. I hope you can help me than, because i try a whole week to fix it.

regards

Martin

2018.VCO2.TSC

0 Marcos López - Online design tools over 12 years ago in reply to Martin Dickhoff

TI__Intellectual 2290 points

Martin,

We made a few changes to the schematic you provided in order to get it to oscillate. We changed the ideal amps for LM318s, the input amplitude of the triangle wave was reduced to 100m peak to improve convergence and a 1k ohm resistor was added in front of the integrator. Please see attached. Should you have any other question please feel free to reply.

Thanks,

Marcos

2018.VCO2-1.TSC

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How to create a VCO with OPV?