offset voltage and electronic noise in Sigma Delta

[sch]

Dear All
Did the effects of offset voltage and electronic noise(flicker and thermal) to the second_order modulator input are attenuated by first and second order noise shaping?
Thank you
SC

 

[jiangxb]

the noise in sigma-delta modulator loop is shapped by preceding integrators, for example the noise on the output of the first integrator is first-order shapped and the noise on the output of the second integrator sencond-order shapped. but the noise to input of sigma-delta modulator isn't attenuated because it is along with the input signal.