Low noise Op Amp design

[tia_design]

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

 

[sunking]

Refer to "cmos analog circuit design"
allen
Chap 7

 

[vdaniel]

The noise of the OA based amplifier highly depends on the signal source impedance. The differen sources need the different OAs. Refer to Linear Technology Desigh Note
https://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1154,C1009,C1021,P2440,D6539

Varuzhan

 

[yibinhsieh]

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.

 

[dog1357]

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.