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參數(shù)資料
| 型號： | RF2469 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | W-CDMA AND PCS LOW NOISE AMPLIFIER/MIXER DOWNCONVERTER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, LCC-20 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 255K |
| 代理商： | RF2469 |
Preliminary
8-40
RF2469
Rev A5 010717
8
F
Output Interfac e Network of the Mixer
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, 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 val-
ues may be reduced and compensated for by including C2 capacitor with a value chosen to maintain the desired F
IF
fre-
quency.
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.
f
IF
1
2
------
C
1
(
2
C
2
C
EQ
+
+
)
2
π
-----------------------------------------------------------
=
R
4
R
OUT
--------------------
R
P
------
–
1
–
=
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| RF2472 | 2.4GHZ LOW NOISE AMPLIFIER WITH ENABLE |
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| RF2483 | LOW NOISE DUAL-BAND QUADRATURE MODULATOR WITH AGC |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RF2471-000 | 功能描述:可復位保險絲 RoHS:否 制造商:Bourns 電流額定值: 電阻:7.5 Ohms 最大直流電壓: 保持電流:0.1 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 跳閘電流:0.6 A 引線間隔: 系列:MF-PSHT 工作溫度范圍:- 40 C to + 125 C |
| RF2472 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:2.4GHZ LOW NOISE AMPLIFIER WITH ENABLE |
| RF2472_06 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:2.4GHz LOW NOISE AMPLIFIER WITH ENABLE |
| RF2472_1 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:2.4GHz LOW NOISE AMPLIFIER WITH ENABLE |
| RF2472G | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:2.4GHz LOW NOISE AMPLIFIER WITH ENABLE |
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