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How to choose the GBW of audio amplifier

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copoler

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g bw audio

Hi all,

I'm puzzled about how to choose the GBW of the pre-amplifier of audio amp, whose close loop gain is 1.

By hand calculation, to keep close loop frequency response identical between 20Hz~20KHz, I think 600K GBW is enough, but the products of TI/NS have GBW more then 2MHz, some even reachs 10MHz.

Thanks
 

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how to choose audio amplifier

copoler said:
Hi all,

I'm puzzled about how to choose the GBW of the pre-amplifier of audio amp, whose close loop gain is 1.

By hand calculation, to keep close loop frequency response identical between 20Hz~20KHz, I think 600K GBW is enough, but the products of TI/NS have GBW more then 2MHz, some even reachs 10MHz.

Thanks
For a closed loop gain of 1 a 600kHz GBW is actually enough. But pre-amplifiers usually are operated with a loop gain of 20 .. 40dB, hence a 10MHz GBW results in a pre-amplifier bandwidth of 1MHz .. 100kHz. That's why they must have such a high GBW.
 

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