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| 型號(hào)： | 11274-502-XTD |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 28 MHz, PDSO16 |
| 封裝： | 0.150 INCH, GREEN, SOIC-16 |
| 文件頁(yè)數(shù)： | 38/40頁(yè) |
| 文件大?。?/td> | 746K |
| 代理商： | 11274-502-XTD |
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7
AMI Semiconductor - Rev. 2.0, Jun. 05
www.amis.com
FS6131-01/FS6131-01g Programmable Line Lock Clock Generator IC
Data Sheet
The transfer function of the phase detector and charge pump combination is (in A/rad):
p
2
chgpump
PD
I
K
=
The transfer function of the loop filter is (in V/A):
÷
è
÷
è
+
=
1
2
1
)
(
sC
R
sC
s
K
LF
The VCO transfer function (in rad/s, and accounting for the phase integration that occurs in the VCO) is:
s
A
s
K
VCO
1
2
)
(
p
=
The transfer function of the feedback divider is:
F
N
K
1
=
Finally, the sampling effect that occurs in the phase detector is accounted for by:
REF
f
s
SAMP
f
s
e
s
K
REF
÷
è
-
=
÷
è
-
1
)
(
The loop gain of the PLL is:
)
(
)
(
)
(
)
(
s
K
s
K
s
K
s
K
SAMP
F
VCO
LF
PD
LOOP
=
0.01
Frequency (f
i)
0.1
0.1kHz
1kHz
10kHz
100kHz
1
10
100
A
m
p
lit
u
d
e
Figure 8: Loop Gain vs. Frequency
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