Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

Preview PDF HTML

LMV227SD Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMV227SD
Description  Production RF Tested, RF Power Detector for CDMA and WCDMA
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMV227SD Datasheet(HTML) 10 Page - National Semiconductor (TI)

Back Button LMV227SD Datasheet HTML 4Page - National Semiconductor (TI) LMV227SD Datasheet HTML 5Page - National Semiconductor (TI) LMV227SD Datasheet HTML 6Page - National Semiconductor (TI) LMV227SD Datasheet HTML 7Page - National Semiconductor (TI) LMV227SD Datasheet HTML 8Page - National Semiconductor (TI) LMV227SD Datasheet HTML 9Page - National Semiconductor (TI) LMV227SD Datasheet HTML 10Page - National Semiconductor (TI) LMV227SD Datasheet HTML 11Page - National Semiconductor (TI) LMV227SD Datasheet HTML 12Page - National Semiconductor (TI)  
Zoom Inzoom in Zoom Outzoom out
 10 / 12 page
background image
Application Notes (Continued)
PRINCIPLE OF OPERATION
The logarithmic response of the LMV227 is implemented by
a de-modulating logarithmic amplifier as shown in Figure 6.
The logarithmic amplifier consists of a number of cascaded
linear gain cells. With these gain cells, a piecewise approxi-
mation of the logarithmic function is constructed.
Every gain cell has a response according to Figure 7.At a
certain threshold (E
K), the gain cell starts to saturate, which
means that the gain drops to zero. The output of gain cell 1
is connected to the input of gain cell 2 and so on.
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 8 shows a logarithmic function on a linear scale and
the piecewise approximation of the logarithmic function.
Figure 9 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:
The size of the error increases with distance between the
thresholds.
20118125
FIGURE 5. Output Ripple vs. RF Input Power
20118119
FIGURE 6. Logarithmic Amplifier
20118120
FIGURE 7. Gain Cell
20118121
FIGURE 8. Log-Function on Lin Scale
20118122
FIGURE 9. Log-Function on Log Scale
www.national.com
10


Similar Part No. - LMV227SD

ManufacturerPart #DatasheetDescription
logo
Texas Instruments		 LMV221 TI1-LMV221 Datasheet
2Mb / 41P		 [Old version datasheet]   50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA
LMV221SD/NOPB TI1-LMV221SD/NOPB Datasheet
2Mb / 48P		 [Old version datasheet]   LMV221 50-MHz to 3.5-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA
LMV221SDX/NOPB TI1-LMV221SDX/NOPB Datasheet
2Mb / 48P		 [Old version datasheet]   LMV221 50-MHz to 3.5-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA
LMV221 TI1-LMV221_14 Datasheet
2Mb / 41P		 [Old version datasheet]   50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA
LMV221 TI1-LMV221_16 Datasheet
2Mb / 48P		 [Old version datasheet]   LMV221 50-MHz to 3.5-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA
More results

Similar Description - LMV227SD

ManufacturerPart #DatasheetDescription
logo
National Semiconductor ...		 LMV225 NSC-LMV225 Datasheet
1Mb / 21P		    RF Power Detector for CDMA and WCDMA
logo
Texas Instruments		 LMV225 TI1-LMV225 Datasheet
2Mb / 39P		 [Old version datasheet]   RF Power Detector for CDMA and WCDMA
LMV225 TI1-LMV225_14 Datasheet
1Mb / 30P		 [Old version datasheet]   RF Power Detector for CDMA and WCDMA
LMV225SD TI-LMV225SD Datasheet
947Kb / 30P		 [Old version datasheet]   LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
LMV225SDX TI-LMV225SDX Datasheet
947Kb / 30P		 [Old version datasheet]   LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
LMV225 TI1-LMV225_16 Datasheet
2Mb / 37P		 [Old version datasheet]   LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
LMV225 TI-LMV225_15 Datasheet
2Mb / 37P		 [Old version datasheet]   LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
logo
National Semiconductor ...		 LMV232 NSC-LMV232 Datasheet
779Kb / 13P		    Dual-Channel Integrated Mean Square Power Detector for CDMA & WCDMA
logo
Texas Instruments		 LMH2100 TI1-LMH2100 Datasheet
1Mb / 49P		 [Old version datasheet]   50-MHz to 4-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA
LMV232 TI-LMV232_15 Datasheet
1Mb / 20P		 [Old version datasheet]   LMV232 Dual-Channel Integrated Mean Square Power Detector for CDMA & WCDMA
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com