參數(shù)資料
型號(hào)： LUCW3000CCN-TR
英文描述： W3000 PLL Dual-Band Frequency Synthesizer
中文描述： W3000鎖相環(huán)雙頻段頻率合成器
文件頁(yè)數(shù)： 20/28頁(yè)
文件大?。?/td> 327K
代理商： LUCW3000CCN-TR
Advance Data Sheet
December 1999
W3000 PLL Dual-Band Frequency Synthesizer
Lucent Technologies Inc.
20
Application Information
(continued)
General rules for the values of these components have been derived many times
1
,
and are quoted here merely
for reference. If:
p
tan
sec
1
T
ω
φ
φ
=
)
3
T
1
T
(
*
1
2
T
2
c
+
ω
=
2
REF
F
20
/
attn
)
*
2
(
1
10
3
T
π
=
where
φ
= Phase margin required, normally 45° for a critically damped response.
p
ω
= Loop bandwidth.
c
ω
= Loop bandwidth modified for extra pole of R3 and C3, as described by:
(
)
(
)
[
]
+
φ
+
1
+
+
+
+
+
T1
φ
=
ω
1
)
3
T
T
(
*
tan
3
T
2
*
1
T
)
3
T
1
T
(
1
*
T3
*
T3)
(T1
T3)
(T1
2
tan
2
c
f
REF
= Reference frequency.
atten = Attenuation provided by the third pole at the reference frequency.
The loop filter values can then be derived as:
2
/
2
2
c
2
2
c
2
2
c
)(
2
c
PD
ω
)
3
T
*
1
1
T
*
1
)
2
T
*
1
*
N
*
Kvco
*
K
*
2
T
1
T
1
C
ω
+
ω
+
ω
+
=
=
1
1
T
2
T
C
2
C
2
C
2
T
1
R
=
The final pole, consisting of R2 and C3, should be chosen such that the following guidelines are followed:
10
1
C
3
C
≤
and
1
R
2
R
≥
1. Rohde, Ulrich L.,
Digital PLL Frequency Synthesizers Theory and Design
, Prentice-Hall, 1983.
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