MK
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Posts: 7
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I am trying to model a very basic system however it is not performing as I expected. I basically have an ideal current source (1 pA) feeding into an ideal capacitor model (1uF) in Spectre. I am expecting a linear relationship of voltage vs time based on integrating the capacitor current equation:
Ic = c*(dVc/dt)
integrating to get
Vc = (1/c)*Ic*t = Kt, where K = (1/c)*Ic
However, I am finding that when I attempt to model this in Cadence using Spectre, the simulation saturates follows an exponential relationship that saturates at the constant K value (1mV). I cannot seem to explain why it does not follow a linear function. Does the specre ideal capacitor model include resistance? If so, is there a way to remove that?
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