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Can this circuit be a buffer?

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mtkee2003

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2.JPG
 

hr_rezaee

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is it a buffer?!

yes this is an analog buffer.
if its current and bandwidth is suitable you can use it.
 

mrniceguy

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Re: is it a buffer?!

An Op AMP works day and night to drive Verror to zero. As such the OP amp as pictured will not make an effective buffer .

Recall that the inputs to an Ideal Op AMP have infinite impedance. As such 100% of your current flow will leach through your unlabeled resistor to ground(path of least impedance) Infinite impedance is as good as a disconnected wire. With NO negative feedback, the error voltage (difference between V+ and V-) will not be Zero. Again "An OP AMP works day and night to drive Verror to zero". You're op amp will have to amplify the input, in order to try and push enough back to the inverting input so that Verror becomes zero (which can not happen with this arrangement and an ideal OP Amp.. in practice it would depend on other factors)

To build a simple op amp buffer remove the resistive branch to ground from the feedback path and simply return the entire ouput to the inverting input. Verror is zero and a buffer is established.
 

vicky

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Re: is it a buffer?!

yes its a buffer working as a non inverting out put amplifier
 

Naveed Alam

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Re: is it a buffer?!

yes its a buffer:D

we use it but don't use it in digital systems because more simpler buffers are available..

Regards
 

Davood Amerion

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is it a buffer?!

Yes, :D
But in this circuit, it is better to disconnect upper pin of resistor from
pin(-) of op-amp and connected it to pin(+) of op-amp.
 

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