some hvmos structure about bcd process,help

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bm429

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hi everyone

i saw some unknown mos structure recently, it's about bcd process.

i post it in the attachment.

i hope someone can tell me what the hvmoses are? ldmos or vdmos or just some demos? and give me some information about the characteristics when i want to design using the
devices.

of course , the details about the mos are welcome

thanks a lot
 

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  • POLY_LAYER.bmp
    873.1 KB · Views: 57
  • PIC1.bmp
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all of them (ldmos, vdmos and demos) can be used as high voltage mos.
Generally, >5V can be regarded as high voltage mos.
 

The honeycomb gate, heavy contacts outside the well and
the "ghost" of a buried layer is a giveaway that "POLY_LAYER"
is a vertical or quasi-vertical device.

The other one looks like a plain longish channel FET to me.
 

thank for you reply.

but i am not familiar with the quasi-vertical device and plain longish channel FET .

can you tell me more details about them?
 

**broken link removed**
 

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