Digital Downconverter (DDC)

NI High-Speed Digitizers Help (NI-SCOPE)

Edition Date: January 2017

Part Number: 370592AB-01

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NI-SCOPE (English | Japanese)

The DDC takes a programmable portion of the Nyquist spectrum of the ADC and moves it down to baseband (centered around 0 Hz). This process is performed by first frequency translating the center of the band of interest to 0 Hz. The data is then filtered and decimated to get alias-protected data of the requested bandwidth. The data output from the DDC is stored into memory at this lower sample rate as complex IQ pairs.

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