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AD6622S/PCB 数据表(PDF) 15 Page - Analog Devices |
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AD6622S/PCB 数据表(HTML) 15 Page - Analog Devices |
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15 / 28 page ![]() AD6622 –15– REV. 0 –150 –2 –1 0 12 –130 –110 –90 –70 –50 –30 –10 10 Figure 16. Unfiltered CIC2 Interpolation Images The CIC2 rejects each of the undesired images while passing the image at baseband. The images of a pure tone at channel center (dc) are nulled perfectly, but as the bandwidth increases the rejection is diminished. The lower band edge of the first image always has the least rejection. In this example, the CIC2 is interpolating by a factor of five and the input signal has a band- width of 0.0033 of the CIC5 output sample rate. Figure 17 shows –110 dBc rejection of the lower band edge of the first image. All other image frequencies have better rejection. –150 –2 –1 01 2 –130 –110 –90 –70 –50 –30 –10 10 Figure 17. Filtered CIC2 Interpolation Images Table IV lists maximum bandwidth that will be rejected to various levels for CIC2 interpolation factors from 1 to 32. The example above corresponds to the listing in the –110 dB column and the LCIC2 = 5 row. It is worth noting that the rejection of the CIC2 improves as the interpolation factor increases. Table IV. CIC2 Alias Protection –110 dB –100 dB –90 dB –80 dB –70 dB 1 Full Full Full Full Full 2 0.0023 0.0040 0.0072 0.0127 0.0226 3 0.0029 0.0052 0.0093 0.0165 0.0292 4 0.0032 0.0057 0.0101 0.0179 0.0316 5 0.0033 0.0059 0.0105 0.0186 0.0328 6 0.0034 0.0060 0.0107 0.0189 0.0334 7 0.0034 0.0061 0.0108 0.0192 0.0338 8 0.0035 0.0062 0.0109 0.0193 0.0341 9 0.0035 0.0062 0.0110 0.0194 0.0343 10 0.0035 0.0062 0.0110 0.0195 0.0344 11 0.0035 0.0062 0.0110 0.0195 0.0345 12 0.0035 0.0062 0.0111 0.0196 0.0346 13 0.0035 0.0062 0.0111 0.0196 0.0346 14 0.0035 0.0063 0.0111 0.0196 0.0347 15 0.0035 0.0063 0.0111 0.0197 0.0347 16 0.0035 0.0063 0.0111 0.0197 0.0347 17 0.0035 0.0063 0.0111 0.0197 0.0348 18 0.0035 0.0063 0.0111 0.0197 0.0348 19 0.0035 0.0063 0.0111 0.0197 0.0348 20 0.0035 0.0063 0.0111 0.0197 0.0348 21 0.0035 0.0063 0.0111 0.0197 0.0348 22 0.0035 0.0063 0.0111 0.0197 0.0348 23 0.0035 0.0063 0.0111 0.0197 0.0348 24 0.0035 0.0063 0.0112 0.0197 0.0348 25 0.0035 0.0063 0.0112 0.0198 0.0349 26 0.0035 0.0063 0.0112 0.0198 0.0349 27 0.0035 0.0063 0.0112 0.0198 0.0349 28 0.0035 0.0063 0.0112 0.0198 0.0349 29 0.0035 0.0063 0.0112 0.0198 0.0349 30 0.0035 0.0063 0.0112 0.0198 0.0349 31 0.0035 0.0063 0.0112 0.0198 0.0349 32 0.0035 0.0063 0.0112 0.0198 0.0349 |
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