wqy1985
Junior Member level 3
I have a question about the out of the sigma-delta modulator. I read some references about the sigma-delta ADC. They say there need a high pass filer in the digital decimation filter in the ADC to reject the DC offset. But I don't know where the DC offset come from, and how to reject it. Is a simple IIR filter is enough? And I also want to know how to decide the specification of the high pass filter. A reference says they use a high-pass filter with a cutoff frequency of 2Hz, and another reference sats they use a high-pass fiter with a cutoff frequency of 20Hz. I am so puzzled about it and need some help.
So thanks for your response
So thanks for your response