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I/O transistor is primary for I/O drive capability.
Analog transisor care about GM/high gain.
Advanced process does provide high gain I/O transistor for analog circuit design.
vgs of nmos
For NMOS to pass 0, as long as Vgs> Vt, NMOS can trun on. It is strong to pass 0.
For NMOS to pass 1, it needs Vgs > Vt to turn on. So it weak to pass 1.
For PMOS to pass 1, the Vg is easy to turn on and pass whole "1"...
So it has PMOS and NMOS to make transmit gate instead of one...
Class A
The amplifier conducts current throughout the entire cycle (360º). The Class A design is the most inefficient and is used in low-power applications as well as in very high-end stereo. Such devices may be as little as 15% efficient, with 85% of the energy wasted as heat.
Class B
The...
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