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參數(shù)資料
| 型號： | TUA6100B6 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Components for Satellite Receiver Units |
| 中文描述： | 元件衛(wèi)星接收單元 |
| 文件頁數(shù)： | 35/46頁 |
| 文件大?。?/td> | 819K |
| 代理商： | TUA6100B6 |
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Preliminary Specification
TUA6100B6
High-Frequency-Products
30
26.1.01
Phase noise performance of application
The over all system phase noise at base band of the TUA 6100 is strongly dependent on several
parameter :
1.programming of the 2
nd
PLL (GHz-PLL setting of the R
2
and N
2
counter)
2.programming of the 1
st
synthesizer PLL
- receiving frequency (variation of the VCO steepness due to non linearity of the varicap),
- phase detector current,
- crystal frequency,
- step size = Fref,
- loop filter parameter. ( bandwidth )
A well balanced phase noise over the whole tuning range requires an optimized parameter
programming of the synthesizer PLL for each receiving frequency
- 1
st
you have to decide for the optimum loop filter bandwidth for your application.
Narrow band loop filter :
achieves better PLL outband phase noise at high frequencies offset but lower PLL inband phase noise at
low frequency offset.
Wide band loop filter :
achieves better PLL inband phase noise at low frequencies offset but lower PLL outband phase noise at
high frequency offset.
- 2
nd
you have to decide for the crystal frequency for your application.
Higher crystal frequency achieves better PLL inband phase noise.
- 3
rd
you have to decide for the varicap for your application.
Linear varicaps achieves better balanced phase noise than non linear varicaps.
- 4
th
you have to decide for the main stepsize for your application.
Higher step size achieve better PLL inband phase noise.
- 5
th
during programming the desired receiving frequency you have to set step size and phase detector
output current for each frequency. This is necessary to compensate the non linearity of the varicap.
For detailed information see our separate application note version B5.
All this is done in our separate application note with the above two application
circuits which obtain the following worst case phase noise values :
Narrow band loop filter
3
Offset Frequency
1
Measured phase noise at base band
- 55
3
10
- 76
3
100
- 98
3
1000
- 100
kHz
kHz
dBc/Hz
Wide band loop filter
Offset Frequency
Measured phase noise at base band
30
1
- 75
30
10
- 77
30
100
- 91
30
1000
- 100
kHz
kHz
dBc/Hz
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