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AD9467 Arkusz danych(PDF) 4 Page - Analog Devices |
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AD9467 Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 6 page CN-0268 Circuit Note Rev. 0 | Page 4 of 6 Figure 6 and Figure 7 shows the resulting antialiasing filter response with a 1 dB bandwidth of 41 MHz and a 3 dB bandwidth of 89 MHz, centered at an IF of 203 MHz. Figure 8 shows the FFT spectrum for the final receiver circuit of Figure 1, where the SNR is 72.5 dBFS, and the SFDR performance approaches 90 dBc. 0 100 200 FREQUENCY (MHz) 300 400 –14.286 –8.571 –2.857 2.857 8.571 14.286 –20.000 20.000 Figure 6. Antialiasing Filter Response, fC = 203 MHz –3.5 –3.0 –2.5 –2.0 –1.5 –1.0 –0.5 0 120 140 160 180 200 220 240 FREQUENCY (MHz) 1dB BW = 41MHz 3dB BW = 89MHz Figure 7. Antialiasing Filter Response, fC = 203 MHz, 1 dB and 3 dB Bandwidth –130 –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0 0 20 40 60 80 100 120 FREQUENCY (MHz) fIN = 203MHz fS = 245.76MHz SNR = 72.5dB SFDR = –88.9dBc H2/H3 = –89.1dBc/–88.9dBc Figure 8. Single Tone FFT Plot, Input = 203 MHz, Sampling Rate = 245.76 MSPS Using ADS as a simulation tool, the filter components can be further tuned to shift the resonant peak to the desired IF. For example, by changing the parallel 8.2 pF capacitor of the antialiasing filter to 10 pF shifts the resonance peak lower to 180 MHz. Figure 9 through Figure 11 show the filter profile and single-tone FFT performance for this condition. 0 100 200 FREQUENCY (MHz) 300 400 –14.286 –8.571 –2.857 2.857 8.571 14.286 –20.000 20.000 Figure 9. Antialiasing Filter Response, fC = 183 MHz –3.5 –3.0 –2.5 –2.0 –1.5 –1.0 –0.5 0 100 120 140 160 180 200 220 240 FREQUENCY (MHz) 1dB BW = 40MHz 3dB BW = 75MHz Figure 10. Antialiasing Filter Response, fC = 183 MHz, 1 dB and 3 dB Bandwidth –130 –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0 0 20 40 60 80 100 120 FREQUENCY (MHz) fIN = 183MHz fS = 245.76MHz SNR = 73dB SFDR = –91dBc H2/H3 = –94dBc/–91dBc Figure 11. Single Tone FFT Plot, Input = 183 MHz, Sampling Rate = 245.76 MSPS |
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