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Problem with initial conditions for large Capacitor value

palz

Hi,

I am quite new to Cadence spectre. I was trying to simulate a simple RC circuit (with time constant 0.05 s ) with sinusoidal input supply with frequency of 250 Hz.

I have a problem with the initial conditions in the capacitor. The initial condition seems to be ignored when the capacitor value is greater than 1 mF.
What could be the problem?  Kindly help me find a solution to this issue.

Parents
  • Andrew Beckett

    This works fine (I doubt this would be dependent upon the version of spectre - I'm using a recent MMSIM15.1 version though):

    // test of ic on big capacitor
    parameters del=10 cap=2m
    V1 (n1 0) vsource type=pulse rise=1n fall=1n delay=del val0=0 val1=1
    R1 (n1 n2) resistor r=1k
    C1 (n2 0) capacitor c=cap ic=0.5

    tran tran stop=del*5

    I get this:

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    This works fine (I doubt this would be dependent upon the version of spectre - I'm using a recent MMSIM15.1 version though):

    // test of ic on big capacitor
    parameters del=10 cap=2m
    V1 (n1 0) vsource type=pulse rise=1n fall=1n delay=del val0=0 val1=1
    R1 (n1 n2) resistor r=1k
    C1 (n2 0) capacitor c=cap ic=0.5

    tran tran stop=del*5

    I get this:

    Regards,

    Andrew.

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