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waveform of the VCO extraction model

4321

 Hello

I made the extraction of Voltage Controlled Oscillator VCO  - the part of PLL. After that I made transient analysis of generated model and I noticed that at the VCO output (eg. "osc_p") the signal is a square wave.In a transistor level circuit the output is sinewave. 

I would like to know if this is correct.

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