參數(shù)資料
型號: L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對地數(shù)字視頻廣播 正交編碼頻率分割多路處理解調器)
中文描述: 的DVB - T COFDM解調器(對地數(shù)字視頻廣播正交編碼頻率分割多路處理解調器)
文件頁數(shù): 24/126頁
文件大小: 953K
代理商: L64780
2-6
Architectural Overview
2.3.3 AGC Loop Gain K
s
The gain of the loop, K
s
, must obey the following rule:
Equation 2.3
where:
F is the slope of the tuner AGC characteristics in dB/V.
is the target value for the input signal.
With an RMS value of
the loop gain is:
, and a tuner characteristic of 50 dB/V,
Equation 2.4
To code K
s
, LSI Logic uses an approximation to the nearest power of 2.
LSI Logic uses the AGC_GAIN[2:0] register, with the following
correspondence:
Equation 2.5
Because the number of values AGC_GAIN can have is limited, so are
those of K
s
. Thus,
Equation 2.6
In our example, AGC_GAIN = 4 is the most appropriate value, giving a
value of:
The real-to-complex block takes the input samples from the ADC output
and converts them into a complex baseband representation for input to
the FFT block.
K
s
8.5
--------------------------
10
5
×
F
σ
T
=
σ
T
σ
0.283
=
K
s
7.5
10
6
×
=
K
s
2
8
2 AGC_GAIN
AGC_GAIN
K
s
log
2
log
2
---------------
4
K
s
1.52
10
5
×
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