Using frequency analysis shown in the plot for this LC circuit I found the resonance frequency of it (138.88 MHz), But when I switched to the transient analysis with a sine pulse at that resonance frequency, I saw ringing on the plot.
I don't understand what causes this issue. I tweaked the sine pulse frequency until I got the ring up and ring down without that ringing artifact at 138.1 MHz. What has caused this frequency difference?
If I calculate the time constant for the ring down based on this time domain response, I would see it is much shorter than what I expected from the Q factor of the coil, what is the reason behind that?
I have attached all of my LTspice plots.
Thank you so much,
Ghoncheh
I don't understand what causes this issue. I tweaked the sine pulse frequency until I got the ring up and ring down without that ringing artifact at 138.1 MHz. What has caused this frequency difference?
If I calculate the time constant for the ring down based on this time domain response, I would see it is much shorter than what I expected from the Q factor of the coil, what is the reason behind that?
I have attached all of my LTspice plots.
Thank you so much,
Ghoncheh
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