aaron_do
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Hi,
the signal that you receive is some signal with a certain bandwidth, called the transmission bandwidth (BT). Therefore, when you down-convert the signal to zero-IF, you are not really looking at the output at 0 Hz, you are looking at the output from 0 Hz to BT/2 Hz. In fact there is a lower limit of the bandwidth too. The IF is a carrier frequency. Zero IF simply means that there is no carrier.
I'm not sure if i understood the question properly, so sorry if I misunderstood.
cheers, Aaron
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