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參數(shù)資料
| 型號： | STV0196 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | QPSK/BPSK DEMODULATOR AND FEC IC |
| 中文描述： | 調(diào)制/ BPSK調(diào)制解調(diào)器和FEC集成電路 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大?。?/td> | 236K |
| 代理商： | STV0196 |
The naturalfrequency and the dampingfactor may be calculatedby the followingformulas :
f
n
=ω
2
π=
where
β
is programmed by the timingregister
F
s
2
π
√
β
K
0
K
d
:
β =
2
beta_tmg
.
: K
0
=
f
K
0
is the constantof the VCO
2
26
.
K
d
is the phase detector ; its value dependson
the roll-off value andon the power of the signal.
: K
d
= 0.977m
2
(in Mode A),
or K
d
= 0.564m
2
(in Mode B).
where m is the programmed reference level
(see AGC part), reset value : m = 24
F
s
is the symbol frequency,
f is the half range of the VCO
Therefore f
n
=
19.210
6
m
F
s
√
or
f
n
=
14.610
6
m
F
s
√
(Mode A)
f 2
(Mode B)
The dampingfactor is :
ξ =α
2
√
K
0
K
d
β
(ModeA) or
ξ =
0.188
m
√
f
2
alpha_tmg
with
α =
2
alpha_tmg
+
12
or
ξ =
0.247
m
√
f
2
alpha_tmg
√
2
beta_tmg can only take value from 0 to 9 ; if beta_tmg = 0, the loop becomesa first orderone.
alpha_tmg can take any value from 1 to 6 ; if both alpha_tmgand beta_tmgare null, theloop is open ; the
duty cycle of the CLKREC output is controlled by writting the timing frequency register.
The next curve shows the natural frequency for a symbol frequency of 20Mbd, in Mode A, with nominal
referencelevel m = 24 as a functionof the VCO relative frequencyhalf range
f, for differentvaluesof the
register value beta_tmg.
The followingchartgivesthevalueofthedampingfactorasafunctionoftheVCOrelativerange,for different
combinations of alpha_tmg and beta_tmg,noticingthat the damping factor only depends on the value of
α
√
β
or (2 . alpha_tmg - beta_tmg ).
√
2
(ModeB).
FUNCTIONAL DESCRIPTION
(continued)
STV0196B
8/23
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| STV0196B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QPSK/BPSK DEMODULATOR AND FEC IC |
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