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Strange behavior in VCO circuit

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Hello NI staff,

I would like to report a strange behavior, maybe a bug, when using a VCO.

In the attached file, I built a simple vco, which is controlled by a dc source.

Frequency is shown in scope.

In normal operation, the frequency changes upon voltage change, according to setup of VCO.

This attached circuit works fine only if the extra scope and spectrum analyzer appear in the rectangle above the active circuit.

If you try to remove the scope and spectrum analyzer in the rectangle, the VCO will not produce coherent sinewave, but rather strange non-symmetrical waves.

Your explanation or bug solve is most welcome.

Sincerely,

Liviu Gal, Lecturer,

Shenkar College 

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