How to choose the GBW of audio amplifier

Status
Not open for further replies.
C

copoler

Member level 1
Joined
Mar 17, 2005
Messages
35
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,527
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
 

how to choose audio amplifier

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.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…