データシートサーチシステム |
|
LMV232 データシート(PDF) 11 Page - Texas Instruments |
|
LMV232 データシート(HTML) 11 Page - Texas Instruments |
11 / 20 page ADC - + FB OUT + LMV232 VREF RFB IOS IDET + - - + FB OUT + LMV232 VREF RFB IOS IDET LMV232 www.ti.com SNWS017C – DECEMBER 2004 – REVISED MARCH 2013 Figure 24. Pedestal Voltage For low input power levels, the pedestal variation VPEDESTAL is the dominant cause of error. Besides temperature variation of the pedestal voltage, which limits the lower end of the range, the pedestal voltage can also vary from part-to-part. By applying a suitable measurement strategy, the pedestal voltage error contribution can be significantly reduced or eliminated completely. POWER MEASUREMENT STRATEGIES This section describes the measurement strategies to reduce or eliminate the pedestal voltage variation. Which strategy is chosen depends on the possibilities for a factory trim and implementation of calibration procedures. Since the pedestal voltage is the reference level for the LMV232, it needs to be calibrated/measured at least once to eliminate part-to-part spread. This is required to determine the exact detector output signal. Because of process tolerances, the absolute part-to-part variation of the output voltage in the absence of RF input power will be in the order of 5 - 10%. All measurement strategies discussed eliminate this part-to-part spread. Strategy 1: Elimination of Part-to-Part Spread at Room Temperature Only In this strategy, the pedestal voltage is determined once during manufacturing and stored into the memory of the phone. At each power measurement this stored pedestal level is digitally subtracted from the measured output signal of the LMV232 during normal operation. The procedure is thus: • Measure the detector output in the absence of RF power during manufacturing. • Store the output voltage value in the cell phone memory (after it is analog-to-digital converted). • Subtract the stored value from each detector output reading. Figure 25. Strategy 1: Room Temperature Calibration Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMV232 |
同様の部品番号 - LMV232_16 |
|
同様の説明 - LMV232_16 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
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 |