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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 14/41頁 |
| 文件大?。?/td> | 463K |
| 代理商： | CE5038 |
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CE5038
Data Sheet
13
Intel Corporation
2.2 AGC Functions
The CE5038 contains an analogue RF AGC combined with digitally controlled gain for RF, baseband pre-filter and
post-filter, as described in Figure 4. The baseband AGC is controlled by the I2C bus and is divided into pre- and
post-baseband filter stages, each of which have 12.6 dB of gain adjust in 4.2 dB steps.
The RF AGC is provided as the dynamic system gain adjust under control of the baseband analogue AGC output
function whereas the digitally controlled gains are provided to maximize performance under different signal
conditions. The total AGC gain range will guarantee an operating dynamic range of -92 to -10 dBm.
The digitally controlled RF gain adjust and the baseband pre-filter stage can be adjusted in sympathy to maintain a
fixed overall conversion gain. The lower RF gain setting would be used in situations where for example there is a
high degree of cable tilt or high desired to undesired ratio, whereas the higher RF gain setting would be used in
situations where for example it is desirable to minimize NF.
The baseband post-filter gain stage can be used to provide additional gain to maintain desired output amplitude
with lower symbol rate applications.
Figure 4 - AGC Control Structure
2.2.1 RF
The RF input amplifier feeds an AGC stage, which provides for RF gain control.
Figure 5 - Typical First Stage RF AGC Response
Normalized gain
range in dB:
0 - 72
0 or +4
0 to 12.6 in 4.2 dB steps
0 to 12.6 in 4.2 dB steps
Gain function:
RF AGC
Stepped
Stepped
Stepped
Control
function:
Analogue
voltage
I2C bus
I2C bus
I2C bus
-80
-70
-60
-50
-40
-30
-20
-10
0
10
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
AGC control voltage V
C
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