[SOLVED] Overflow of integrator in CIC filter

[phongphanp]

You should consider some thing like this:

Power of circuit's operation ?
Can clock signal be reduce rating ?
System is in Niquist Zone ? https://en.wikipedia.org/wiki/Nyquist_frequency
...
etc.

 

[FvM]

I'm still missing a consistent description of the problems you are observing:

But what I am facing right now is,
Simulation: works great
Experiment(when I downloaded the system to the FPGA) : does not work

Referring to the simulation result (got from ModelSim), all the output signals except from comb part is correct.
Only the comb output is wrong.

I think posting the actual CIC code and test bench is the best way to make the problem understandable. Preferably as appended files.

 

[yhatagishi]

Dear FvM and phongphanp,


Thank you two.

I found CIC filter itself was working fine.
But the main purpose of realizing delta sigma ADC is not still solved.
I posted a new thread about it so please help me there.

I appreciate your help.


Best regards,

Yukihiro Hatagishi