Layout of Serial MOSFET

[quyleanh]

In order to increase length of MOSFET, the schematic designer can connect multiple MOSFET as serial.

I would like to ask about this configuration in layout. Should I place MOSFET in vertical or horizontal?

Thank you.

 

[ljp2706]

It’s all about what fits in your layout area and personal preference. But if you do it horizontal, you can share diffusion with the series devices to make it a little more compact. And then you can add dummy devices on the edges if necessary. If it’s a high current trace, and your stripe widths are not very big, vertical may be easier to meet electromigration requirements if you have many fingers.

 

[quyleanh]

Thank you. After trying some patterns of my layout, I think the horizontal one is a bit better, although the wiring is complex.
But as you said, it depends on actual design. The vertical pattern is good as well.