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Home » news » Streaming and Recording Application Options for the U5303A High-Speed Digitizer: An Example (2/2)

Streaming and Recording Application Options for the U5303A High-Speed Digitizer: An Example (2/2)

In the following example, we capture 2 channels simultaneously at 1 GS/s with signal at 1.8 GHz center frequency  and 200 MHz IBW  

Sampling and compliancy with Nyquist zones

– The IBW is in 4th Nyquist band (between 1.5 GHz and 2 GHz) and doesn’t cross over between Nyquist zones

– For signal in 4th Nyquist band, sampling at 1 GHz Fs causes an aliased signal in negative frequency domain . This aliased signal is then down-converted in baseband

Filtering requirements

– It is recommended to add a pass-band filter at the digitizer input, selecting the signal IBW (1.7 GHz to 1.9 GHz)

Local Oscillator

– For down conversion, LO would be set at signal center frequency 1.8 GHz  (physically the signal is aliased at -200 MHz, thus LO is at -200MHz).

IBW and data rate

– The signal 200 MHz IBW  requires to select higher decimated sampling rate 250 MS/s, resulting in a 1000 MB/s data rate

Multi-channel streaming

– Using U5303A-CB1: a single digitizer can manage the 2 channels simultaneously since streaming limit is 2.4 GB/s

   – either use two digitizers

   – or a single digitizer with 12-bit mode: this case results in two channels at 700 MB/s per channel with resolution: I – 12 bits, Q – 12 bits

To learn more about our Application Options, please contact us at acquiris_support@keysight.com

 

 

About Benedetta Viti

Benedetta is a PR & Web Editor. She is the key player behind the blog High-Speed ADC, willing to know more about the people behind the products. She holds a Bachelor in Languages and a Master in International Marketing.

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