Solving for Transfer Function of Op Amp

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insanepenguin5908

Joined Sep 10, 2012
2
This showed up on a pop quiz today and couldn't figure it out. Been looking around on the internet and it doesn't seem to fit into a type so I'm not sure how to go about solving it. See picture. My guess was v0=-Rf/R1 + R2 but I don't think that is right. Help would be greatly appreciated!
 

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Audioguru

Joined Dec 20, 2007
11,248
If the opamp is powered and if the input voltage fits within its allowed input voltage range then R2 does not affect the output voltage unless it is many megohms.

It is an ordinary non-inverting amplifier.
The output voltage is V2 x [(Rf/R1) +1].
 

mlog

Joined Feb 11, 2012
276
This showed up on a pop quiz today and couldn't figure it out. Been looking around on the internet and it doesn't seem to fit into a type so I'm not sure how to go about solving it. See picture. My guess was v0=-Rf/R1 + R2 but I don't think that is right. Help would be greatly appreciated!
It's the configuration shown at the top of the page in the link below.

http://www.allaboutcircuits.com/vol_3/chpt_8/5.html
 
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