High-Speed DACs Ease Transmitter Designs

For CATV distribution in the 50-MHz-to-1-GHz band, Nyquist theory states that a DAC with sample rate higher than 2 GSamples/s should be adequate for synthesizing the entire CATV band. The dominant harmonic product for a DAC is typically the third harmonic (HD3), assuming a differential output where...

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Bibliographic Details
Published in:Microwaves & RF 2010-08, Vol.49 (8), p.66
Main Authors: Kuckreja, Ajay, Ostrem, Geir
Format: Magazinearticle
Language:English
Subjects:
Bandwidths
Cable TV
CMOS
Design
High speed
Radio frequency
Signaling
Spectrum allocation
Transmitters
Online Access:Get full text
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Summary:For CATV distribution in the 50-MHz-to-1-GHz band, Nyquist theory states that a DAC with sample rate higher than 2 GSamples/s should be adequate for synthesizing the entire CATV band. The dominant harmonic product for a DAC is typically the third harmonic (HD3), assuming a differential output where second harmonic content is strongly attenuated. If a DAC with sampling rate of 2.5 GSamples/s is used [Fig. 1(a)], the third-harmonic image for a real 1-GHz carrier will be located at 500 MHz.
ISSN:0745-2993
2162-1411