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參數(shù)資料
| 型號： | LMV710M5X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Low Power, RRIO Operational Amplifiers with High Output Current Drive and Shutdown Option |
| 中文描述： | OP-AMP, 3200 uV OFFSET-MAX, 5 MHz BAND WIDTH, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 708K |
| 代理商： | LMV710M5X |
Application Note
(Continued)
GSM POWER AMPLIFIER CONTROL LOOP
There are four critical sections in the GSM Power Amplifier
Control Loop. The class-C R
power amplifier provides am-
plification of the R
F
signal. A directional coupler couples
small amount of R
energy from the output of the R
P. A. to
an envelope detector diode. The detector diode senses the
signal level and rectifies it to a DC level to indicate the signal
strength at the antenna. An op-amp is used as an error
amplifier to process the diode voltage and ramping voltage.
This loop control the power amplifier gain via the op-amp
and forces the detector diode voltage and ramping voltage to
be equal. Power control is accomplished by changing the
ramping voltage.
The LMV710, LMV711 and LMV715 are well suited as an
error amplifier in this application. The LMV711 and LMV715
have an extra shutdown pin to switch the op-amp to shut-
down mode. In shutdown mode, the LMV711 and LMV715
consume very low current. The LMV711 provides a ground
voltage to the power amplifier control pin V
. Therefore, the
power amplifier can be turned off to save battery life. The
LMV715 output will be “tri-stated” when in shutdown.
10132506
FIGURE 9. Typical of GSM P.A. Control Loop
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMV710M5X/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV711 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINGLE LOW-POWER RRIO OPERATIONAL AMPLIFIERS WITH HIGH OUTPUT CURRENT DRIVE AND SHUTDOWN |
| LMV711A EA WAF | 制造商:Texas Instruments 功能描述: |
| LMV711IDBVR | 功能描述:運算放大器 - 運放 Sngl Lo-Pwr RRIO Hi Out Crnt Drv/Shtdwn RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV711IDBVRE4 | 功能描述:運算放大器 - 運放 Sngl Lo-Pwr RRIO Hi Out Crnt Drv/Shtdwn RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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