wqy1985
Junior Member level 3
I am studying a digital filter(used in a sigma-delta ADC). It is a multistage filter. I use the FDATool in matlab to generate the code of all the filter. And then I use the modelsim to simulate. But I can't understand the result(it looks like it will always increase(positive and negative alternatively)) which I will attach below(I plot some points of the results in matlab). the input is 4bits, output is 24bits, input signal frequency is 6.144MHz, decimation factor is 128. I attach the whole design below(including the verilog code, testbench, and mytestbench(I imply a sine wave)). Hope someone give me some clue.
thanks in advance.
thanks in advance.