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Q of a tank circuit

Sumit Dash

Hi,
 I am trying to find the Q of a series resonance circuit. To do so, I plotted the Y parameter of the tank. I got the resonance frequency from the plot. However, when I am using the cross-function to get the 3dB bandwidth of the tank, it is showing some error messages.


Cross Function to get the 3 dB bandwidth in series tank :  cross( db(ypm('sp 1 1))  ymax(db(ypm('sp 1 1))) - 3 1 "either" t "cycle" nil). 
Error message: too many arguments (at most 7 expected, 8 given).

Is there any other way of doing the same?

Parents

  • Dear Sumit Dash,

    Sumit Dash said:
    I am trying to find the Q of a series resonance circuit. To do so, I plotted the Y parameter of the tank. I got the resonance frequency from the plot. However, when I am using the cross-function to get the 3dB bandwidth of the tank, it is showing some error messages.

    For a frequency domain signal, a more appropriate function to use to compute the 3 dB bandwidth of a signal is the bandwidth() ViVA or ocean function. In your case, since you are essentially interested in the 3 dB bandwidth of what appears to be a "bandpass" response, the type argument of the function should be set to "band". In your case, I think the appropriate expression may be:

    bandwidth( db(ypm('sp 1 1) 3 "band")

    Shawn

Reply

  • Dear Sumit Dash,

    Sumit Dash said:
    I am trying to find the Q of a series resonance circuit. To do so, I plotted the Y parameter of the tank. I got the resonance frequency from the plot. However, when I am using the cross-function to get the 3dB bandwidth of the tank, it is showing some error messages.

    For a frequency domain signal, a more appropriate function to use to compute the 3 dB bandwidth of a signal is the bandwidth() ViVA or ocean function. In your case, since you are essentially interested in the 3 dB bandwidth of what appears to be a "bandpass" response, the type argument of the function should be set to "band". In your case, I think the appropriate expression may be:

    bandwidth( db(ypm('sp 1 1) 3 "band")

    Shawn

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