RLC circuit AC simulation result does not match transient analysis result at resonant frequency!

[Siamak_M]

Hi,

It is a very basic series RLC circuit. (R=0.1 Ohm, L=10mH, C=100nF) which is excited by a sine wave voltage source (100mV peak, 5032 Hz).

AC analysis is in-line with hand calculations and shows a peak current of 1A at 5032.9 Hz. Once we do a transient analysis at this frequency, the current is way lower; instead if we change the frequency down to 4968 Hz, it gives the maximum current (appx. 1A). Note that all the components are ideal and both amplitudes of the voltage source set at 100mV. I must be missing something very basic.

The attached file shows it clearer.

Thanks,

[Siamak_M]

It is basically caused by numerical error in high-Q circuits around resonance.

Here it is the link to similar discussion that I just found.

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