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Asymmetric Transistor Vs Symmetric Transistor

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020170

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1. I don't know the reason why Assymetric Tr is used with Symmetric TR in some case.

Why it is used ? What is its merit?

2. Asymmetric TR's source terminal must be "GND" or "VDD"

I am not sure why it’s so. Why so?
 

2. Asymmetric TR's source terminal must be "GND" or "VDD"

I am not sure why it’s so. Why so?

According your question, the aysmmetric device can not be the cascode device because the source terminal is always GND. I am also curios about that.
 

From what i know, asymmetric transistors are used to reduce layout area size compared to symmetric one. Also, basically the source of the asymmetric transistors are automatically tied to their bulk.. but I'm not sure becasue some foundries have different design rules.. From simulation point, I don't exactly know what is their difference, so maybe we can hear answer from others...
 
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