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Negative drain current in p-channel MOSFETs

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lucky6969b

lucky6969b

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This is a noob question, apology if I am not using the right terms.

I wonder if the polarity of drain current is negative in p-channel MOSFETs when it is conducting, does that mean the current is flowing from source to drain or not (or I am getting mixed up)?

Another one is in bipolar transistors, the signal current is always centered around the
base current, so that the current never get reversed (always positive above 0A), and the current will never flow in the opposite direction.... that means from signal source, to the ground lead and back up into the base junction thru the emitter

Thanks
Jack
 

Yes, negative current in the PMOS means the current flows from source to drain.

In a bipolar amplifier you need to always keep the transistor turned on (unless you are wanting a class C type operation, for example) and the signal is usually superimposed on a nominal bias current. Reverse biasing the base-emitter junction will not allow you to do anything.

Keith
 

keith1200rs said:
Yes, negative current in the PMOS means the current flows from source to drain.

In a bipolar amplifier you need to always keep the transistor turned on (unless you are wanting a class C type operation, for example) and the signal is usually superimposed on a nominal bias current. Reverse biasing the base-emitter junction will not allow you to do anything.

Keith
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Hi Keith, thanks for your clarifications.
Jack
 

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