Tlaloc
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Dallas, TX
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I always thought that β was a function of the base thickness, not the surface area. With that assumption, you couldn't do much in layout.
Unless you are talking about lateral bjt's. Then the thickness dimension is affected by layout.
The problem is that bjt models are notoriously non-scalable, which means that you need a separate model for every layout. Without testchips, you would really know the performance of your custom layout before your chip taped out.
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