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AD6622S/PCB 데이터시트(PDF) 15 Page - Analog Devices

부품명 AD6622S/PCB
상세설명  Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP
PDF  28 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD6622S/PCB 데이터시트(HTML) 15 Page - Analog Devices

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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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