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參數(shù)資料
| 型號(hào)： | RMPA2271 |
| 廠(chǎng)商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 衰減器 |
| 英文描述： | WCDMA/UMTS Power Edge Power Amplifier Module with Integrated Power Detector |
| 中文描述： | 1920 MHz - 1980 MHz RF/MICROWAVE NARROW BAND LOW POWER AMPLIFIER |
| 封裝： | 3 X 3 MM, 1 MM HEIGHT, LEAD FREE, LCC-8 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大小： | 373K |
| 代理商： | RMPA2271 |
4
www.fairchildsemi.com
RMPA2271 Rev. B
R
PRELIMINARY
Application Note
Due to the varying amplitude envelope of WCDMA signal, a filter is required at the Pdet pin in order to minimize the ripple noise of the
detector output voltage (Pdet). RMPA2271 has no integrated filter for the Pdet pin. Therefore, an external low-pass filter, comprising a
shunt resistor (R) and a shunt capacitor (C), is required to detect the WCDMA signal properly. The filter bandwidth is determined by
the RC time constant of the filter, and can be reduced by increasing the values of the resistor and/or capacitor. A narrower filter band-
width has the advantage of lower voltage ripple noise, but it comes at the expense of increased response time. A tradeoff needs to be
made between the ripple noise and response time for the optimal system performance.
The detector output voltage (Pdet) range can be adjusted by the value of the external shunt resistor (R). The following figure shows
the dependence of Pdet voltage as a function of R. The maximum Pdet voltage can be increased by raising the value of R. This pro-
vides the added flexibility to handset designers to change the detector range to meet the system requirements.
It is recommended that the value of the resistor R is first determined depending on the desired detector output voltage range. Then
the value of the shunt capacitor C is selected for the required detector output voltage ripple level, and response time.
2
8
7
6
5
SMA1
RF IN
Vcc2
Pdet
(package
base)
50 ohm
TRL
50 ohm
TRL
3.3
μ
F
Vref
3.3
μ
F
1000 pF
1000 pF
1000 pF
0.1
μ
F
3
Vmode
C
R
9
4
SMA2
RF OUT
1
Vcc1
2
X
Z
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-10
-5
0
5
10
15
20
25
30
Pout (dBm)
P
R=9.1k Ohm
R=5.1k Ohm
R=2.4k Ohm
RMPA2271
3x3
WCDMA
PAM
with
Power
Detector
Vcc=3.4V, Vref=2.85V, Vmode=0V, Freq=1950MHz, Temp=25
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| RMPA2450 | 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:2.4-2.5 GHz GaAs MMIC Power Amplifier |
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| RMPA2451-TB | 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:2.4?2.5 GHz GaAs MMIC Power Amplifier |
| RMPA2453 | 功能描述:射頻放大器 2.4-2.5 GHz InGaP HBT Linear Power Amp RoHS:否 制造商:Skyworks Solutions, Inc. 類(lèi)型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類(lèi)型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測(cè)試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| RMPA2455 | 功能描述:射頻放大器 2.4-2.5 GHz 1 Watt InGaP HBT RoHS:否 制造商:Skyworks Solutions, Inc. 類(lèi)型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類(lèi)型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測(cè)試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
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