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AD8392AACPZ-R2 Arkusz danych(PDF) 11 Page - Analog Devices |
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AD8392AACPZ-R2 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 13 page AD8392A Data Sheet Rev. A | Page 10 of 12 MULTITONE POWER RATIO The DMT signal used in ADSL/ADSL2+ systems carries data in discrete tones or bins, which appear in the frequency domain in evenly spaced 4.3125 kHz intervals. In applications using this type of waveform, multitone power ratio (MTPR) is a commonly used measure of linearity. MTPR is defined as the measured difference from the peak of one tone that is loaded with data to the peak of an adjacent tone that is intentionally left empty. Figure 19 and Figure 20 show the AD8392A MTPR for a 5.5 crest factor waveform for empty bins in the ADSL and extended ADSL2+ bandwidths. 0 –100 CENTER 646.9kHz SPAN 10kHz –10 –20 –30 –40 –50 –60 –70 –80 –90 Figure 19. MTPR at 647 kHz 0 –100 CENTER 1.9664kHz SPAN 10kHz –10 –20 –30 –40 –50 –60 –70 –80 –90 Figure 20. MTPR at 1.966 MHz |
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