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參數(shù)資料
| 型號： | MC12179 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 500 - 2800 MHz Single Channel Frequency Synthesizer |
| 中文描述： | 500 - 2800兆赫頻率合成器的單頻道 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 353K |
| 代理商： | MC12179 |
7
MOTOROLA RF/IF DEVICE DATA
Figure 10. Transfer Function for the Crystal Noise in the Frequency Plane
Figure 11. Transfer Function for the VCO Noise in the Frequency Plane
T(j )
N
1
j
2
o
1
K3K4
4
o4
B
2
o2
j
2
o
(AK4
K5)
3
o3
T(j )
K3K4
4
o4
B
2
o2
j
(AK4
K5)
3
o3
1
K3K4
4
o4
B
2
o2
j
2
o
(AK4
K5)
3
o3
Appendix: Derivation of Loop Filter Transfer Function
The purpose of the loop filter is to convert the current from
the phase detector to a tuning voltage for the VCO. The total
transfer function is derived in two steps. Step 1 is to find the
voltage generated by the impedance of the loop filter. Step 2
is to find the transfer function from the input of the loop filter to
its output. The “voltage” times the “transfer function” is the
overall transfer function of the loop filter. To use these
equations in determining the overall transfer function of a PLL
multiply the filter’s impedance by the gain constant of the
phase detector then multiply that by the filter’s transfer
function (which is unity in the 2nd and 3rd order cases
below).
Figure 12. Overall Transfer Function of the PLL
For the 2nd Order PLL:
Vp
Co
Ro
Vt
ZLF(s)
RoCos
1
Cos
TLF(s)
Vt(s)
Vp(s)
1 , Vp(s)
Kp(s)ZLF(s)
For the 3rd Order PLL:
Vp
Co
Ro
Vt
ZLF(s)
RoCos
1
CoRoCas2
Vt(s)
Vp(s)
(Co
Ca)s
TLF(s)
1 , Vp(s)
Kp(s)ZLF(s)
Ca
For the 4th Order PLL:
Vp
Co
Ro
Vt
ZLF(s)
(RoCos
1) (RxCxs
1)
CoRoCaRxCxs3
[ (Co
Ca)RxCx
CoRo(Cx
Ca) ] s2
(Co
Ca
Cx)s
TLF(s)
Vt(s)
Vp(s)
1
(RxCxs
1), Vp(s)
Kp(s)ZLF(s)
Ca
Rx
Cx
A
A
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC12179D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:500 - 2800 MHz SINGLE CHANNEL FREQUENCY SYNTHESIZER |
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| MC12181D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:125 - 1000 MHZ FREQUENCY SYNTHESIZER |
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| MC1218L | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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