# how to amplify and shift input voltage with op-amps

#### dzss

Joined Jan 27, 2022
1
Hi, I'm trying to amplify and shift a voltage input of 0 to 0.35V to 0.25 to 5V using only op-amps and resistors. I currently have a model (picture) but the simulation is giving me an error " Voltage source and/or inductor loop involving E_U3". I set up a DC sweep of the input voltage from 0 to 0.35V.

Is there a simpler way to do this?

#### BobTPH

Joined Jun 5, 2013
8,686
You have tied the output of U3 to ground.

Edited to add: Yes, there us a simpler way to do it using only one opamp. Write the function you want mathematically, then look at the equation for a summing amp, and see if you can map your function onto the summing amp.

Bob

Last edited:

#### ericgibbs

Joined Jan 29, 2010
18,669
hi dzss,
This is a simple option.
E

#### Ian0

Joined Aug 7, 2020
9,533
Hi, I'm trying to amplify and shift a voltage input of 0 to 0.35V to 0.25 to 5V using only op-amps and resistors. I currently have a model (picture) but the simulation is giving me an error " Voltage source and/or inductor loop involving E_U3". I set up a DC sweep of the input voltage from 0 to 0.35V.

Is there a simpler way to do this?

View attachment 258876
First thing to consider is "Do you really need the 0.25V offset?". If you don't it makes things much simpler and you don't need a voltage reference.