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參數(shù)資料
| 型號： | RF2870 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC16 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 400K |
| 代理商： | RF2870 |
8-9
RF2870
Rev A8 030507
IF Output Interface Network
Single-End IF Matching
L1, C1, C2, and R form a current combiner which performs a differential to single-ended conversion at the IF frequency
and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to
the following equation:
Where C
EQ
is the equivalent stray capacitance and capacitance looking into pins 9 and 10. An average value to use for
C
EQ
is 2.5pF.
R can then be used to set the output impedance according to the following equation:
where R
OUT
is the desired output impedance and R
P
is the parasitic equivalent parallel resistance of L1.
C
2
should first be set to 0 and C1 should be chosen as high as possible (not greater than 39pF), while maintaining an R
P
of L1 that allows for the desired R
OUT
. If the self-resonant frequencies of the selected C1 produce unsatisfactory linearity
performance, their values may be reduced and compensated for by including C2 capacitor with a value chosen to main-
tain the desired F
IF
frequency.
L2 and C3 serve dual purposes. L2 serves as an output bias choke, and C3 serves as a series DC block.
In addition, L2 and C3 may be chosen to form an impedance matching network if the input impedance of the IF filter is
not equal to R
OUT
. Otherwise, L2 is chosen to be large (suggested 120nH) and C3 is chosen to be large (suggested
22nF) if a DC path to ground is present in the IF filter, or omitted if the filter is DC-blocked.
IF-
IF+
C2
R
L1
L2
V
CC
100 pF
C3
CDMA
IF Saw
4
5
9
10
CDMA IF+
CDMA IF-
C1
C1
f
IF
1
2
------
C
1
2
C
2
C
EQ
+
+
(
)
2
π
-----------------------------------------------------------
=
R
4
R
OUT
--------------------
R
P
------
–
1
–
=
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RF2870PCBA | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER |
| RF2872-000 | 制造商:TE Connectivity 功能描述:GDT - Trays |
| RF2873-000 | 功能描述:POLYSWITCH 1.25A RESET FUSE RAD RoHS:是 類別:過電壓，電流，溫度裝置 >> PTC 可復位保險絲 系列:LVB125 標準包裝:500 系列:PFRA 電流 - 維持(Ih):750mA 電流 - 跳閘(It):1.5A 電流 - 最大:40A 電壓 - 最大:60V R最小/最大:0.180 ~ 0.400 歐姆 跳閘時間:6.3s 封裝/外殼:徑向 - 圓盤形 包裝:散裝 |
| RF2877-000 | 制造商:TE Connectivity 功能描述:GDT - Trays |
| RF2878 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:3V LOW NOISE AMPLIFIER/ 3V PA DRIVER AMPLIFIER |
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