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Current flow doesn match in a bipolar circuit with eldo

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A strange problem

I simulate a bipolar circuit with eldo, and I find a very strange problem： when power supply rise from 0(0ms) to 10V(50ms), from the operating point, I found the current flow out a path didn't equal the current flow in the same path, because some current flow through the substrate, but the substrate is reverse biasing, why?
Could some experts help me?
:?: :?: :!:
 

Re: A strange problem

Your frontend schematic entry could have hidden nodes (substrate). It is in most design-kits an either explicite terminal, a text string or a nonaccessable hidden terminal. If you haven such hidden substrate terminal and you do not connect it back to your testbench circuit ground you can get backbias effects.
 

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