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參數(shù)資料
| 型號(hào)： | AD9879BSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PROCESSOR FRONT END 100MQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 通道數(shù)： | 5 |
| 功率（瓦特）： | 587mW |
| 電壓 - 電源，模擬： | 3.3V |
| 電壓 - 電源，數(shù)字： | 3.3V |
| 封裝/外殼： | 100-BQFP |
| 供應(yīng)商設(shè)備封裝： | 100-MQFP（14x20） |
| 包裝： | 托盤 |
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AD9879
Rev. A | Page 23 of 32
02773-015
FREQUENCY RELATIVE TO I/Q NYQUIST BW
0
1.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
MAGNITUDE
(dB)
–1
–2
–3
–4
–5
–6
Figure 15. Cascaded Filter Pass-Band Detail (N = 4)
02773-016
FREQUENCY RELATIVE TO I/Q NYQUIST BW
0
1.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
MAGNITUDE
(dB)
–1
–2
–3
–4
–5
–6
Figure 16. Cascaded Filter Pass-Band Detail (N = 3)
To keep the bandwidth of the data in the flat portion of the filter
pass band, the user must oversample the baseband data by at
least a factor of two prior to representing it to the AD9879.
Without oversampling, the Nyquist bandwidth of the baseband
data corresponds to the fNYQ. Consequently, the upper end of the
data bandwidth suffers 6 dB or more of attenuation due to the
frequency response of the digital filters.
There is an additional concern if the baseband data applied to
the AD9879 has been pulse shaped. Typically, pulse shaping is
applied to the baseband data via a filter having a raised cosine
response. In such cases, an α value is used to modify the
bandwidth of the data where the value of α is such that 0 < α <
1. A value of 0 causes the data bandwidth to correspond to the
Nyquist bandwidth. A value of 1 causes the data bandwidth to
be extended to twice the Nyquist bandwidth.
Thus, with 2× oversampling of the baseband data and α =1,
the Nyquist bandwidth of the data corresponds with the I/Q
Nyquist bandwidth.
As stated earlier, this results in problems near the upper edge of
the data bandwidth due to the frequency response of the filters.
The maximum value of α that can be implemented is 0.45. This
is because the data bandwidth becomes:
()
NYQ
f
α
725
.
0
1
2
1
=
+
(16)
which puts the data bandwidth at the extreme edge of the flat
portion of the filter response.
If a particular application requires an α value between 0.45 and
1, then the user must oversample the baseband data by at least a
factor of four. The combined HBF1, HBF2, and CIC filter
introduces a worst-case droop of less than 0.2 dB over the
frequency range of the data to be transmitted.
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD9879BSZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9879-EB | 制造商:Analog Devices 功能描述:Evaluation Board For Mixed Signal Front End Set Top Box, Cable Modem 制造商:Analog Devices 功能描述:DEV TOOLS, MIXED SGNL FRONT END SET TOP , CBL MODEM - Bulk |
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| AD9880/PCBZ | 功能描述:KIT EVALUATION AD9880 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:Advantiv® 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
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