thank you for the input. I already have the paper and use it for the initial design stage.
Actually I am using a second order intgrator, but thinking to upgrade to 3rd or 4th order, but not sure whether it is advisable.
I am taking the output prior to the low pass filter output. So, the feedback it still in switching pulses.
I am very concerned about the harmonics, how to reduce it. I did manage to minimise odd order harmonics, but the second one is really high.
Could anyone suggest the cause for the even harmonics?
Thankyou.