Closed loop op-amp gain (double check)

Thread Starter

Engineering_Junkie

Joined Sep 9, 2015
41
Hey everyone,

I just want to double check my calculation on closed loop gains of operational amplifiers,

I'll be amplifying a DC signal by 25, the open loop gain from the data sheet is http://imgur.com/a/uajei
or roughly 100 x (10^6) V/V at 0 Hz.

For my closed loop system I'll be amplifying by 25 or 25 V/V so this will result in roughly a gain 27.95 DB from this calculation (https://e2e.ti.com/support/data_converters/audio_converters/f/64/t/50665)

which results in the following bandwidth: http://imgur.com/a/TlzYu

Is this correct?

Thanks in advance for any help!
 

ronv

Joined Nov 12, 2008
3,770
Hey everyone,

I just want to double check my calculation on closed loop gains of operational amplifiers,

I'll be amplifying a DC signal by 25, the open loop gain from the data sheet is http://imgur.com/a/uajei
or roughly 100 x (10^6) V/V at 0 Hz.

For my closed loop system I'll be amplifying by 25 or 25 V/V so this will result in roughly a gain 27.95 DB from this calculation (https://e2e.ti.com/support/data_converters/audio_converters/f/64/t/50665)

which results in the following bandwidth: http://imgur.com/a/TlzYu

Is this correct?

Thanks in advance for any help!
Use the gain bandwidth number from the data sheet and divide it by your gain.
 
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