Digital down converter

The process can preserve all the information in the frequency band of interest of the original signal.

The lowpass filters pass the difference (i.e. baseband) frequency while rejecting the sum frequency image, resulting in a complex baseband representation of the original signal.

Several variations on the DDC are useful, including many that input a feedback signal into the DDS.

These include: DDCs are most commonly implemented in logic in field-programmable gate arrays or application-specific integrated circuits.

This data is commonly taken directly from analog-to-digital converters (ADCs) sampling at tens or hundreds of MHz.