Reduce Vdd form 5Volt to 3.3Volt in AMS CXQ 0.8u technology

[kickeyes]

Normally, Vdd of 0.8u use 5V,so can it use to design opamp by using Vdd = 3.3V?
If Vdd=3.3V. is typically,Can we consider worse case form 2.7-3.6V?

 

[dick_freebird]

Yes, you can run at reduced voltage. The lower end will
be set more by design style (folded vs tall stacks) but
op amps seldom use minimum channel length so the only
real penalty is the thicker gate ox / lower gm of devices.

The worst case upper / lower voltages, are between you
and your customer / application. Getting a wide supply
range might be a "feature", and for portables the lower
end may want to be sub-cell-voltage for maximum battery
life. You have to determine the application and what it
wants, to arrive at the "datasheet".

 

[kickeyes]

Thank you very much, It is obvious