AC simulation plots frequency decade lower

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  • 2. May 2025 at 20:09 #8982
    Garry Grut
    Participant

      This schematic expects the freq. for Vout_dB to be approx. 1.58KHz. with inductor L1=0.1H.
      Note that V1’s phase is -90 degrees.

      The result however is 158 Hz for both uSimmics 5.8I  and QucsStudio 4.3.1
      If L1 is changed to 0.01H than we get 1.58KHz

      I did run the circuit in Qucs 0.0.19 and also in LTspice, which gave the expected frequency.

      How can I explain the decade difference between the simu;aters.

       

      Attachments:
      1. AC-sim-with-V1-phase-minus-90-degrees.sch
      9. January 2026 at 23:13 #9177
      MarioK
      Participant

        I don’t really get your explanation. But compared to LTspice, the results are identical – under the condition that you use 1e3 or 1k (lower case letter!) as resistor values. The capital K used as an SI prefix is just ignored by uSimmics.

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