why cant we have unconnected source or drain ?

[vivekrajeev]

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

 

[not-a-moderator]

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.

 

[vivekrajeev]

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

 

[not-a-moderator]

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.

 

[jeffrey samuel]

unconnected drain or source that is really a strange idea

no current literally flows then through the MOS

 

[LvW]

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

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

 

[erikl]

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

Widerstand ist zwecklos ;-)
Resistance is pointless

 

[dick_freebird]

"What is the sound of one hand clapping?"

 

[jeffrey samuel]

an clear open circuit and response at load is always 0 never more than that

 

[sina.parsnejad]

are you sure it is a transistor ?
maybe there is a misunderstanding

 

[jeffrey samuel]

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

he means it that is what we all are really amazed about

 

[erikl]

Re: unconnected source or drain ?

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

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.