The scenario
Illustrating the architecture of a direct-sampling SDR receiver for HF radio, showing the signal flow from antenna to digital baseband.
What is in this drawing
Read the decisions behind it.
01
Choosing to place the ADC close to the antenna after minimal analog filtering
02
Using a DDC to downconvert the wideband sample stream to baseband I/Q
03
Implementing the NCO as a separate block for clarity
Useful when explaining modern SDR front-ends that eliminate analog mixers.
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