Can we give input voltage higher than the supply voltage for the open loop Opamp? ex:LMV321

 

you will have to look at the datasheet. the answer is typically yes, but very limited. usually you can get input slightly above Vdd by usually 0.3v.

but check the datasheet to be sure.

 

thank you millwood for your response..

Actually I wanted to know if we can give 20V input to the opamp with 3.3V supply...

 

Actually I wanted to know if we can give 20V input to the opamp with 3.3V supply...

the answer is highly likely a "no", but check the datasheet for sure.

 

You may consider using a resistor divider to get the voltage into the range where the opamp can handle it.

 

Actually I wanted to know if we can give 20V input to the opamp with 3.3V supply...

The LMV321's input maximum limits are the voltage rails, in your case ground to 3.3v.

As StayAtHome mentioned, you can use a resistive divider to get the voltage within limits.

<snip> open loop Opamp?

If you want open-loop gain, look at comparators instead of opamps.

 

Why do you want to do this? The input to the inverting pin is often thru a resistor and fom many circuits the voltage of the inverting pin hardly changes from 0. Just because you are using voltages of 20 volts does not mean the op amp has to see them.