I am designing class D audio amplifer with 3W,I find it hard to design BW to 20KHz,It need better THD and PSRR,so the Au of system is large, that result in smaller BW that can't design to 20K,who can help me about it? thanks!!!
first of all, Thank you for quick responding.
The frequency is 250KHz,Beause range of audio is 20H~20KH,so I feel that the loop BW should be designed to 20k above, right?
I think the loop BW should not be 20KHz, what is the effection of loop? perhaps you should search some patents about pole and zero of audio loop. It is related with loop configuration, such as single loop or double loop.
do you mean the bw of the integrator?
I think if you design the bw to 20k, in the audio frequency range you can't obtain a uniform phase shift.
however,if you want to get a better THD,you should enlarge the bw.