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參數(shù)資料
| 型號： | S5H1420 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | Channel Decoder for DVB-S/DSS |
| 中文描述： | 頻道解碼器DVB-S/DSS |
| 文件頁數(shù)： | 7/31頁 |
| 文件大?。?/td> | 849K |
| 代理商： | S5H1420 |
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S5H1420
DBS Channel Decoder for DVB-S/DSS
-7
3.2.2 Loop equation
The timing loop may be considered as a second order loop. The loop equation may be calculated using
the following formula:
ε
= 1<< ((
P
g
+8) –
I
g
)
ω
=
Φ
t
(1<<
I
g
)
Where,
P
g
is propagational gain,
I
g
is integral gain and
Φ
t
is timing factor.
Φ
t
= 5.0
And we can choose Loop
Bandwidth (
BL
), as follows:
1
1
2
ξ
Where
ξ
is the reference level of the
ε
and
ω
.
ω ε
×
×
1
24
sym
clk
f
f
2
)
4
1
2
ξ
ω
+
×
×
×
=
BL
ξ
=
2
3.2.3 Timing lock indicator
The timing detector need to a lot of symbols for stabilization in order to lock after tuning frequency
change of RF and it takes a 1-bit input signal, and uses the presence or absence of locking information
to either count up or count down respectively.
The counter operates up to reaches its maximum value when the lock signal goes active. Two cases
can cause the lock signal to go to unlocked state; one is assertion of the active-low reset and the other
the counter go zero again. User can monitor the MSB 8 bits of TLL (timing lock loop) counter in
Address 0x1a and the TLL lock flag in Address 0x14.
3.3 Carrier recovery
The tracking range of the derotator is ±
f
clk
/2
(
± f
sampling
/2
).
This algorithm is used with QPSK reception, over a small range of capture phases and with a channel
noise value over 3.0 dB.
3.3.1 Loop equation
Like the timing loop, the carrier loop is a second-order system where two parameters,
ε
and
ω
.
ε
= 1<< ((
P
g
+8) –
I
g
)
ω
=
Φ
p
(1<<
I
g
)
Where,
P
g
is propagational gain,
I
g
is integral gain and
Φ
p
is phase factor.
1
24
2
Φ
p
= 75.4
×
Also, we can choose Loop Bandwidth (
BL
), as follows:
1
1
2
ξ
Where
ξ
is the reference level of the
ε
and
ω
.
ω ε
×
sym
clk
f
f
)
4
1
2
ξ
ω
+
×
×
×
=
BL
ξ
=
2
3.3.2 Carrier lock detector
Samsung Electronics Co, Ltd. Proprietary Information
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S5H1420X01 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:Channel Decoder for DVB-S/DSS |
| S-5-H-16.4-D | 制造商:Interconnect Devices Inc (IDI) 功能描述:S-5-H-16.4-D S/C 制造商:Interconnect Devices Inc (IDI) 功能描述:PROBE |
| S-5-H-16.4-D S/C | 功能描述:觸點探頭 HEADED SERRATED RoHS:否 制造商:IDI 類型:Probes 尖端類型:Spherical Radius 長度:8.26 mm 電流額定值:10 A 彈力:2.3 oz 行程:1.52 mm 系列:101050 |
| S5H16.4G | 制造商:Interconnect Devices Inc (IDI) 功能描述:SPRING CONTACT PROBE PCB 制造商:Interconnect Devices Inc (IDI) 功能描述:SPRING CONTACT PROBE, PCB 制造商:Interconnect Devices Inc (IDI) 功能描述:SPRING CONTACT PROBE, PCB; Connector Type:Test Point; Connector Tip Style:Waffle; Current Rating:5A; Overall Length:36.07mm; Spring Force Initial:2.8oz; Spring Force Working Travel:16.4oz; Centerline Spacing:4.75mm; Length:1.420" ;RoHS Compliant: Yes |
| S-5-H-16.4-G | 制造商:Interconnect Devices Inc (IDI) 功能描述:GLD PLTD WAFFLE, SIZE 5, SPRING FORCE 8OZ@.170 TRAVEL, GLD PLT PLUNGER |
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