HI ALL

i hesitated if this issue belong to this section but i will be very happy if some one of u will help me
i need to create sigma delta modulator for some application.
there is any section in the modulator that named noise shaping - it means that after oversampling signal we make integrator loops to the quantization noise and move the quantization noise to higher frequency at the spectrum and "clean" the wanted signal around the base band.
Attached design of 3rdvorder noise shaping.
because of the three integrators i got 270 degrees phase shift and it Disturbing me.

i thought to add one more loop that treat the delay or to add pole near the 0.

Does someone have an idea to reduce this delay???Click image for larger version. 

Name:	dc.jpg 
Views:	13 
Size:	30.4 KB 
ID:	60806