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參數(shù)資料
| 型號： | sda 9187-3X |
| 廠商： | SIEMENS AG |
| 英文描述： | Analog-Digital-Converter For Picture in Picture(用于畫中畫的6位模數(shù)轉(zhuǎn)換器) |
| 中文描述： | 模擬數(shù)字為畫中畫（用于畫中畫器的6位模數(shù)轉(zhuǎn)換器） |
| 文件頁數(shù)： | 14/25頁 |
| 文件大小： | 111K |
| 代理商： | SDA 9187-3X |
Semiconductor Group
14
SDA 9187-3X
Design of the Loop Filter Network
For the calculation of the control response the following formulas can be applied.
Characteristic circuit frequency:
loop bandwidth
damping factor
ω
0
= (K/
C
1
)
0.5
ζ
= 0.5
×
R
×
(K
×
C
1
)
0.5
K = 0.52 typical
K = 0.75 maximum
The parallel capacitance
C
2
should not exceed 5 % of
C
1
.
Because of the discrete detection of the phase differences every 64
line frequency is superimposed on the transient response of the PLL. To make sure that this phase
modulation is damped sufficiently.
s, phase modulation of half the
1.74 >
R
1
×
47
×
10
– 6
×
1/
×
(1 – 2 / (1 + e
α
))
a
= 64
μ
s. /
(R
1
×
C
2
)
R
1
×
C
2
<< 64
μ
s
1.74 >
R
1
×
47
×
10
– 6
×
1/
with
or approx. by
For the board layout it is important to
a) block supply lines near the supply pins,
b) keep the wiring of C2 short.
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