Delta Sigma Modulator output to Decimation Filter

[Eminent.Engineer]

Hello Everyone

The Delta Sigma Modulator has 1-bit quantizer (so 0s and 1s as output) so Do I need to take 0s and 1s as input to Decimation filter or I need to convert them to -1 and +1, got confused after some literature review, any suggestion will be highly appreciated.

Thanks in Advance.

 

[FvM]

If you prefer 2's complement numbers throughout the decimation filter, you may want to extend the 1-bit input to two bits representing -1 and +1. But it's not straightforward in my view. You can also interprete the filter's number format as straight binary, requesting for 0/1 input. Then convert the output to 2's complement by inverting the MSB. Using one or the other option doesn't change anything essential to the arithmetic operations inside the filter.