- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361042 > LMV226 (National Semiconductor Corporation) RF Power Detector for CDMA and WCDMA PDF資料下載
參數(shù)資料
| 型號(hào)： | LMV226 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | RF Power Detector for CDMA and WCDMA |
| 中文描述： | RF功率檢測(cè)器的CDMA和WCDMA |
| 文件頁(yè)數(shù)： | 19/21頁(yè) |
| 文件大小： | 1090K |
| 代理商： | LMV226 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)當(dāng)前第19頁(yè)第20頁(yè)第21頁(yè)
Application Notes
(Continued)
All gain cell outputs are AM-demodulated with a peak detec-
tor and summed together. This results in a logarithmic func-
tion. The logarithmic range is about:
20 · n · log (A)
where,
n = number of gain cells
A = gain per gaincell
Figure 9
shows a logarithmic function on a linear scale and
the piecewise approximation of the logarithmic function.
Figure 10
shows a logarithmic function on a logarithmic
scale and the piecewise approximation of the logarithmic
function.
The maximum error for this approximation occurs at the
geometric mean of a gain section, which is e.g. for the third
segment:
(9)
The size of the error increases with distance between the
thresholds.
LAYOUT CONSIDERATIONS
For a proper functioning part a good board layout is neces-
sary. Special care should be taken for the series resistance
R
(
Figure 1
) that determines the attenuation. For high re-
sistor values the parasitic capacitance of the resistor may
significantly impact the realized attenuation. The effective
attenuation will be lower than intended. To reduce the para-
sitic capacitance across resistor R
1
, this resistor can be
composed of several components in series instead of using
a single component.
20076020
FIGURE 8. Gain Cell
20076021
FIGURE 9. Log-Function on Lin Scale
20076022
FIGURE 10. Log-Function on Log Scale
L
www.national.com
19
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMV226TL | RF Power Detector for CDMA and WCDMA |
| LMV226TLX | RF Power Detector for CDMA and WCDMA |
| LMV228 | RF Power Detector for CDMA and WCDMA |
| LMV228SD | RF Power Detector for CDMA and WCDMA |
| LMV228SDX | RF Power Detector for CDMA and WCDMA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV226TL | 制造商:Texas Instruments 功能描述:RF DETECTOR BUMP MICRO SMD-4 226 |
| LMV226TL/NOPB | 功能描述:射頻檢測(cè)器 Rf Detector For Handsets RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
| LMV226TLEVAL | 功能描述:BOARD EVALUATION FOR THE LMV226 RoHS:否 類別:RF/IF 和 RFID >> RF 評(píng)估和開發(fā)套件，板 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
| LMV226TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:RF Power Detector for CDMA and WCDMA |
| LMV226TLX/NOPB | 功能描述:射頻檢測(cè)器 RoHS:否 制造商:Skyworks Solutions, Inc. 配置: 頻率范圍:650 MHz to 3 GHz 最大二極管電容: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SC-88 封裝:Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。