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參數(shù)資料
| 型號(hào)： | CE5038 |
| 廠商： | Intel Corp. |
| 英文描述： | DVB-S2 Advanced Modulation Satellite Tuner |
| 中文描述： | DVB - S2的先進(jìn)調(diào)制衛(wèi)星調(diào)諧器 |
| 文件頁(yè)數(shù)： | 15/41頁(yè) |
| 文件大?。?/td> | 463K |
| 代理商： | CE5038 |
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CE5038
Data Sheet
14
Intel Corporation
The RF AGC is divided into two stages. The first stage is a continually variable gain control stage, which is
controlled by the AGC sender and provides the main system AGC set under control of the analogue AGC signal
generated by the demodulator section. The second stage is a bus programmable. two-position gain set previous to
the quadrature mixer and provides for 4 dB of gain adjust under software control.
The analogue RF AGC is optimized for S/N and S/I performance across the full dynamic range. The RF AGC
characteristic, variation of IIP2, IIP3 and NF are contained in Figure 6, Figure 7 & Figure 8 respectively.
The RF preamplifier is also coupled to the selectable RF bypass, which is described in 2.3, “RF Bypass“. The
specified electrical parameters of the RF input are unaffected by the RF bypass state.
Figure 6 - Variation in IIP2 with AGC Setting
(RF gain adjust = +0 dB, prefilter = +4.2 dB and postfilter = 4.2 dB, baseband filter bandwidth = 22 MHz)
Figure 7 - Variation in IIP3 with AGC Setting
(RF gain adjust = +0 dB, prefilter = +4.2 dB and postfilter = 4.2 dB, baseband filter bandwidth = 22 MHz)
-10
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Gain setting dB
I
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Gain setting dB
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