swicap
Member level 5
I want to design a digital multibit delta sigma modulator.
I have a question on multibit quantizer design.
The quantizer is a 2bit 4level quantizer.
In simulink, the quantizer's input/output relationship is: (reference is 1 / -1).
input output
-1 ~ -0.5 -1
-0.5 ~ 0 -1/3
0 ~ 0.5 1/3
0.5~ 1 1
I don't know if this relationship is right.
if output level is uniformaly distributed from -1 to 1,
how to mapping it to digital implementation.
I mean if the output is 2bit signal, and the feedback path
is , for example, 10bit to the adder, it is impossible to give
the precise level value 1/3 and -1/3.
Thanks for your reply.
Added after 2 hours 10 minutes:
add:
in the image attached,
i plot 2 I/O schems for 2bit quantizer.
which is right?
I have a question on multibit quantizer design.
The quantizer is a 2bit 4level quantizer.
In simulink, the quantizer's input/output relationship is: (reference is 1 / -1).
input output
-1 ~ -0.5 -1
-0.5 ~ 0 -1/3
0 ~ 0.5 1/3
0.5~ 1 1
I don't know if this relationship is right.
if output level is uniformaly distributed from -1 to 1,
how to mapping it to digital implementation.
I mean if the output is 2bit signal, and the feedback path
is , for example, 10bit to the adder, it is impossible to give
the precise level value 1/3 and -1/3.
Thanks for your reply.
Added after 2 hours 10 minutes:
add:
in the image attached,
i plot 2 I/O schems for 2bit quantizer.
which is right?