liusupeng
Advanced Member level 4
![](data:image/svg+xml;charset=utf-8,<svg height="328px" width="437px" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)
for simple first order sigma delta adc model, which one of the above is correct?
for (a), the transfer function is Y=X+(1-{Z}^{-1 } )Q.
and for (b), the transfer function is Y={Z}^{ -1}X+(1-{Z}^{-1 })Q.
---------- Post added at 09:05 ---------- Previous post was at 09:00 ----------
It is also interesting to note that both structures are used in second order sigma delta modelling.
