Down conversion is basic operation in communications and signal processing. Down-converters perform a transformation of radio frequency (RF) signal into a baseband signal centered at the zero frequency. Digital down converters are used in high performance equipment, providing ultimate quality: ideal mixer without non-linear distortions, phase noise or temperature stability problems, fully controllable filters and decimation, possibility of programmable digital channel equalization. However, digital down conversion requires high speed analog-to-digital converter (ADC) and real time data processing.
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