Sunday, 20 March 2016

mosfet - bulk to source pn junction


In a p-channel MOSFET, if I connect the bulk to the drain instead of connecting the bulk to the source, I will have my bulk-source pn junction forward biased. Since the source potential is by definition lower than the drain voltage (which is the same as the bulk voltage because bulk and drain will be connected), the voltage of the source will be lower than the voltage of the bulk. Will current flow from the bulk to the source? Is it to prevent this that we connect the bulk to the source?




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