Low noise Op Amp design

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Has any body designed low noise Operational Amplifier? In which way you minimized the noise? What i mean is mainly based on CMOS process.
 

Refer to "cmos analog circuit design"
allen
Chap 7
 

I think the noise is counter-proportional to the device size and you can increase the size to reduce the noise. And you can use large gate length to reduce short channel effect.

Yibin.
 

i remember one saying that PMOS is less noise than NMOS as electrons are moving faster than holes, hence create more noise.
SO for the input stage, PMOS pair is preferred.
 

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