CJS in Bipolar Device Model

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batelab

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What is "Cjs" in a PNP device model? What's this capacitance physically?

Is there any trick one could use to get the PNP device with large Cjs to run faster?
 

batelab said:
What is "Cjs" in a PNP device model? What's this capacitance physically?
Click to expand...
It's the zero bias collector-substrate depletion capacitance, s. PDF below.
batelab said:
Is there any trick one could use to get the PNP device with large Cjs to run faster?
Click to expand...
Cjs decreases when the collector-to-substrate voltage increases. And you can reduce its effect if you use a cascode stage.
 

    batelab

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