regarding feedback in given opamp

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shivamgarg

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Hi folks...

I require help in interpreting the feedback network that is provided with the opamp. What does this feedback do?

FYI, the given opamp is amplifier with common mode feedback circuit.

Thanks.
 

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It's a symmetrical bandpass amp,
  • lower bandpass frequency=1/(2π*15Cu*100k),
  • upper bandpass frequency=1/(2π*Cu*100k),
    (or 1/(2π*Cu*Rload), whichever is lower)
  • bandpass differential gain=15, low common gain
 

Isn't it a second order high pass
high pass freq1=1/(2π*Cu*100k)
high pass freq2 =1/(2π*Cu*Rload)
Click to expand...
?

- - - Updated - - -

Plus additonal low pass with Tlp = Rsource*15Cu
 

FvM said:
Isn't it a second order high pass?

- - - Updated - - -

Plus additonal low pass with Tlp = Rsource*15Cu
Click to expand...

Yes, of course. I just wanted to give a hint for the case Rsource ≪ 100kΩ .

... and then this
erikl said:
upper bandpass frequency=1/(2π*Cu*100k),
(or 1/(2π*Cu*Rload), whichever is lower)
Click to expand...
... is nonsense, sorry!
 

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