loose-electron
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Best Design Tool = Capable Designers
Posts: 1638
San Diego California
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Two immediate things come to mind here:
Capacitance accuracy - MOS Caps are nonlinear, suggest you go to a MIM type that exhibits more linearity. Sometimes this is also poorly modeled.
Current Accuracy - How is your current being defined? Unless there is an external current reference, or some trim/adjustment, most internally defined current sources have an absolute value error that is pretty large.
Two good places to start. After that, you need to start looking at the min-max accuracy/tolerances of all the parts and pieces.
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