Hi, I've spent some time reading about oversampling and I think I understand the fundamentals. Oversample by some factor > desired bandwidth, decimate and increase ENOB (with certain assumptions about dithering, etc). My signal of interest is slowly varying (1-2 Hz), and I'm using a 10-bit ADC, oversampling at 10 ksamples/sec. Two questions: 1. For oversampling, some documents talk about accumulate and decimate ("dump") where after accumulation, LSBs are chopped off and the new sample has increased number of bits. Do I still need to low-pass filter after the decimation? Some documents mention the low-pass and some do not. 2. Is a moving-average filter an acceptable low-pass if the answer to above is "yes"? I understand the MAF will only help reduce noise, but will not help me with ENOB. Thanks! Rob.
Oversampling & moving-average-filter
Started by ●February 3, 2008