gggould
Member level 3
Hi all,
The following is CIC output spectrum (Ycic) obtained from passing a 16MHz SDM signal (Ysdm) through CIC decimation filter (Hcic).
1. I would expect the Ycic=Hcic*Ysdm, but where does those humps around 1.8MHz come from?
My guess is alias, but I don't know if it is from aliased_Ysdm * Hcic , or Ysdm * aliased_Hcic, or aliased_Ysdm * aliased_Hcic ...
2. Why doesn't the 250KHz signal tone get aliased to 1750KHz??
Thanks
The following is CIC output spectrum (Ycic) obtained from passing a 16MHz SDM signal (Ysdm) through CIC decimation filter (Hcic).
1. I would expect the Ycic=Hcic*Ysdm, but where does those humps around 1.8MHz come from?
My guess is alias, but I don't know if it is from aliased_Ysdm * Hcic , or Ysdm * aliased_Hcic, or aliased_Ysdm * aliased_Hcic ...
2. Why doesn't the 250KHz signal tone get aliased to 1750KHz??
Thanks