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Abstract-The

16位高精度多輸入隔離模擬前端(AFE)

Abstract: This document explains how the Cupertino (MAXREFDES5#) subsystem reference design meets the higher resolution, higher voltage,and isolation needs of industrial control and industrial automation applications. Hardware and firmware design files as well as FFTs andhistograms from lab measurements are provided.

標簽： AFE 高精度輸入模擬前端

上傳時間： 2013-10-21

上傳用戶：mnacyf
2012TI電子設計大賽——微弱信號檢測裝置

微弱信號檢測裝置四川理工學院劉鵬飛、梁天德、曾學明摘要：本設計以TI的Launch Pad為核心板，采用鎖相放大技術設計并制作了一套微弱信號檢測裝置，用以檢測在強噪聲背景下已知頻率微弱正弦波信號的幅度值，并在液晶屏上數字顯示出所測信號相應的幅度值。實驗結果顯示其抗干擾能力強，測量精度高。關鍵詞：強噪聲；微弱信號；鎖相放大；Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detection device, to measure the known frequency sine wave signal amplitude values of the weak in the high noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detection; lock-in-amplifier; Launch Pad 1、引言隨著現代科學技術的發展，在科研與生產過程中人們越來越需要從復雜高強度的噪聲中檢測出有用的微弱信號，因此對微弱信號的檢測成為當前科研的熱點。微弱信號并不意味著信號幅度小，而是指被噪聲淹沒的信號，“微弱”也僅是相對于噪聲而言的。只有在有效抑制噪聲的條件下有選擇的放大微弱信號的幅度，才能提取出有用信號。微弱信號檢測技術的應用相當廣泛，在生物醫學、光學、電學、材料科學等相關領域顯得愈發重要。 2、方案論證針對微弱信號的檢測的方法有很多，比如濾波法、取樣積分器、鎖相放大器等。下面就針對這幾種方法做一簡要說明。方案一：濾波法。在大部分的檢測儀器中都要用到濾波方法對模擬信號進行一定的處理，例如隔離直流分量，改善信號波形，防止離散化時的波形混疊，克服噪聲的不利影響，提高信噪比等。常用的噪聲濾波器有：帶通、帶阻、高通、低通等。但是濾波方法檢測信號不能用于信號頻譜與噪聲頻譜重疊的情況，有其局限性。雖然可以對濾波器的通頻帶進行調節，但其噪聲抑制能力有限，同時其準確性與穩定性將大打折扣。

標簽： 2012 TI 電子設計大賽微弱信號

上傳時間： 2013-11-04

上傳用戶：lty6899826
模擬IC性能的權衡模擬到數字化設計的挑戰

Abstract: Many digital devices incorporate analog circuits. For instance, microprocessors, applicationspecificintegrated circuits (ASICs), and field-programmable gate arrays (FPGAs) may have internalvoltage references, analog-to-digital converters (ADCs) or digital-to-analog converters (DACs). However,there are challenges when you integrate more analog onto a digital design. As with all things in life, inelectronics we must always trade one parameter for another, with the application dictating the propertrade-off of analog function. In this application note, we examine how the demand for economy of spaceand cost pushes analog circuits onto digital substrates, and what design challenges emerge.

標簽： 模擬IC 性能模擬數字化設計

上傳時間： 2013-11-17

上傳用戶：菁菁聆聽
24位ADC在心電圖中的應用筆記

Abstract: This application note describes the essential workings of an electrocardiogram (ECG). It discussesfactors that disrupt the ECG signals and make reliable, highly-accurate electrical characterization difficult. Theindustry-standard solution for ECG electrical characterization, which uses an analog front-end and ADCcombination, is explained. The article then introduces the MAX11040 simultaneous-sampling, sigma-deltaADC as a compelling, highly integrated solution that eliminates the need for the AFE, and saves both spaceand cost for the application.

標簽： ADC 24位心電圖中的應用

上傳時間： 2013-12-23

上傳用戶：sssl
正確的混合信號設計印刷電路板(PCB)的接地

Abstract: This tutorial discusses proper printed-circuit board (PCB) grounding for mixed-signal designs. Formost applications a simple method without cuts in the ground plane allows for successful PCB layouts withthis kind of IC. We begin this document with the basics: where the current flows. Later, we describe how toplace components and route signal traces to minimize problems with crosstalk. Finally, we move on toconsider power supply-currents and end by discussing how to extend what we have learned to circuits withmultiple mixed-signal ICs.

標簽： PCB 正印刷電路板混合信號

上傳時間： 2013-11-04

上傳用戶：pol123
如何設計升壓轉換器MAX17597峰值電流模式控制器

Abstract: This application note describes how to design boost converters using the MAX17597 peakcurrent-mode controller. Boost converters can be operated in discontinuous conduction mode (DCM) orcontinuous conduction mode (CCM). This operating mode can affect the component choices, stress levelin power devices, and controller design. Formulas for calculating component values and ratingsare alsopresented.

標簽： 17597 MAX 如何設計升壓轉換器

上傳時間： 2013-11-16

上傳用戶：zcs023047
音頻數模轉換器DAC抖動的靈敏度分析

Abstract: This application note describes how sampling clock jitter (time interval error or "TIE jitter") affectsthe performance of delta-sigma digital-to-analog converters (DACs). New insights explain the importanceof separately specifying low-frequency (< 2x passband frequency) and high-frequency or wideband (> 2xpassband frequency) jitter tolerance in these devices. The article also provides an application example ofa simple highly jittered cycle-skipped sampling clock and describes a method for generating a properbroadband jittered clock. The document then goes on to compare Maxim's audio DAC jitter tolerance tocompetitor audio DACs. Maxim's exceptionally high jitter tolerance allows very simple and low-cost sampleclock implementations.

標簽： DAC 音頻數模轉換器抖動

上傳時間： 2013-10-25

上傳用戶：banyou
高集成數字RF調制器解決方案

Abstract: A digital RF modulator, an integrated solution that satisfies stringent DOCSIS RF-performancerequirements, takes advantage of modern technologies like high-performance wideband digital-to-analogconversion and CMOS technology scaling. This application note describes the concept and advantages ofa digital quadrature amplitude modulation (QAM) modulator that uses the direct-RF architecture to enablea cable access platform (CCAP) system.

標簽： 集成數字RF 調制器方案

上傳時間： 2013-10-20

上傳用戶：drink！
晶體振蕩器設計,以滿足您的應用

Abstract: Quartz crystals are mechanical resonators with piezoelectric properties. The piezoelectricproperties (electric potential across the crystal is proportional to mechanical deformation) allow their use

標簽： 晶體振蕩器

上傳時間： 2013-10-17

上傳用戶：時代將軍
提高在噪聲環境下的磁卡讀寫器(MCR)系統

Abstract: Most magnetic read head data sheets do not fully specify the frequency-dependent components andare often vague when specifying other key parameters. In some cases, the specifications of two very similarheads from two different manufacturers might be quite different in terms of parameters specified and omitted.The limitations in the data sheets make designing an optimum card reading system unnecessarily difficult andtime consuming. This document outlines a strategy to overcome the above shortcomings and offers guidelinesto overcome the noise issues.

標簽： MCR 噪聲環境磁卡讀寫器

上傳時間： 2013-11-13

上傳用戶：dysyase