temperature impact on CMOS folded cascode op amp

[tia_design]

folded cascode op

I designed a folded cascode op amp, when doing simulation for different temperature, I found big difference for different temperature. I never did this before, so generally how to analysis it? What is the impact of temeprature on op amp performance?

 

[pfd001]

constant gm input folded cascode

which spec is changed at different temperature in your design? The temperature will change the gain and GBW

 

[nuiscet]

cmos op amp, temperature

The process is not good.

 

[ericliu]

To overcome the temperature dependence, it's better to adopt the constant-gm design.

 

[caosl]

Generally speaking, the cmos opamp's performance influenced by temperature will not so large either biased with constant or ptat current.

 

[johnsmith101]

The transconductance of the input diff pair will vary with temperature. If this is a concern, you should bias it with a current source that will result in a constant gm. See page 248 of Analog Integrated Circuit Design by Johns and Martin

 

[OMEsystem]

The transconductance of the input diff pair will vary with temperature. If this is a concern, you should bias it with a current source that will result in a constant gm. See page 248 of Analog Integrated Circuit Design by Johns and Martin

The gm of input pair varies within 2 from -25 to 125 degC, so the DC gain
should have 6dB difference regarding gm variaton.

 

[rambus_ddr]

check your dc point, maybe some transistors have been in triode.

 

[hebu]

The transconductance of the input diff pair will vary with temperature. If this is a concern, you should bias it with a current source that will result in a constant gm. See page 248 of Analog Integrated Circuit Design by Johns and Martin

The gm of input pair varies within 2 from -25 to 125 degC, so the DC gain
should have 6dB difference regarding gm variaton.

I think the gm of input pair varies √2 rather 2.
Gds is not varied with temp much. So get the picture?