why cant we have unconnected source or drain ?

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vivekrajeev

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Hi
Whty cant we have unconnected drain or source in layout what will happen? Please clarify
 

Do you mean Drain or Source of a MOSFET?
Why would you want to connect a mosfet in your circuit and not connect the drain or source?
You would simply be applying a voltage to the gate and the rest of the mosfet would just do nothing.
 

Yes i mean unconnected drain and source of mosfet. What happens if such a scenario is there ? I
 

The gate of the MOSFET doesn’t conduct current – it just senses the voltage.
The mosfet would just do nothing, apart from being able to conduct once you connect its drain and source to a voltage potential.
 
unconnected drain or source that is really a strange idea

no current literally flows then through the MOS
 

vivekrajeev said:
Yes i mean unconnected drain and source of mosfet. What happens if such a scenario is there ? I
Click to expand...

What happens if you leave one pin of a resistor unconnected?
 

Re: unconnected source or drain ?

vivekrajeev said:
Hi
Why cant we have unconnected drain or source in layout what will happen? Please clarify
Click to expand...

It could be a dummy transistor. Usually dummy transistors are short-cut and connected to GND or VDD (or any other virtual GND node), however this isn't necessary in any case: dummy transistors shall ensure geometrical/physical continuity at the edges of transistor rows or arrays. If their nodes are left unconnected, they still fulfill their purpose, and the missing connections don't really matter.

Nothing will happen.
 
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