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Help: SiGe HBT Comparator

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chemaphy

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Hello all,

I am now designing a comparator for my ADC. When I simulate the comparator, I get very strange transient response. At the transistion edge, I tend to get some ringing effect around the edge. Can any expert comment on that? I guess I am not supposed to get those ripples. Can any expert give me some suggestion to fix that problem?? I have include a diagram below to let you see the ringing effect. I will appreciate very much for your help.

Thanks,
chemaphy



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