Digital-to-analog converters (DACs) are prevalent inindustrial control and automated test applications.General-purpose automated test equipment often requiresmany channels of precisely controlled voltagesthat span several voltage ranges. The LTC2704 is ahighly integrated 16-bit, 4-channel DAC for high-endapplications. It has a wide range of features designed toincrease performance and simplify design.
上傳時(shí)間： 2013-11-22
上傳用戶：元宵漢堡包
The MAX2691 low-noise amplifier (LNA) is designed forGPS L2 applications. Designed in Maxim’s advancedSiGe process, the device achieves high gain andlow noise figure while maximizing the input-referred 1dBcompression point and the 3rd-order intercept point. TheMAX2691 provides a high gain of 17.5dB and sub 1dBnoise figure.
標(biāo)簽： Amplifier Low-Noise 2691 Band
上傳時(shí)間： 2014-12-04
上傳用戶：zaocan888
Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.
標(biāo)簽： EMI 開關(guān)電源 英文
上傳時(shí)間： 2013-11-10
上傳用戶：1595690
Abstract: Stuxnet, a sophisticated virus that damaged Iran's nuclear capability, should be an eye openerfor the world. We can choose to learn something very narrow (how to combat the Stuxnet virus) or wecan choose to focus on the larger goal of thwarting the next type of creative cyber attack. Unfortunately,critical industrial infrastructure is not currently designed with security as a key goal, leaving open multipleavenues for an educated and funded attacker to create massive problems. This tutorial outlines somebasic concepts that engineers and product definers should consider to make sure their new projects stayahead of future threats.
標(biāo)簽： 智能電網(wǎng) 安全保護(hù)
上傳時(shí)間： 2013-11-17
上傳用戶：llwap
Abstract: Investment in smart meters and smart grid end equipment continues to grow worldwide as countriestry to make their electric delivery systems more efficient. However, as critical as the electric deliveryinfrastructure is, it is normally not secured and thus subject to attack. This article describes the concept oflife-cycle security—the idea that embedded equipment in the smart grid must have security designed into theentire life of the product, even back to the contract manufacturer. We also talk about how life-cycle securityapplies to embedded equipment in the smart grid. Potential threats are discussed, as are potential solutionsto mitigate the risks posed by those threats.
標(biāo)簽： 智能電表 智能電網(wǎng)
上傳時(shí)間： 2014-12-24
上傳用戶：熊少鋒
兩節(jié)鋰電充電IC-ASC8512 ASC8512 為開關(guān)型兩節(jié)鋰聚合物電池充電管理芯片，非常適合于便攜式設(shè)備的充電管理應(yīng)用。ASC8512 集內(nèi)置功率MOSFET、高精度電壓和電流調(diào)節(jié)器、預(yù)充、充電狀態(tài)指示和充電截止等功能于一體，采用TSSOP-14、SSOP-14兩種封裝形式。ASC8512對(duì)電池充電分為三個(gè)階段：預(yù)充（Pre-charge）、恒流（CC／Constant Current）、恒壓（CV／Constant Voltage）過程，恒流充電電流通過外部電阻決定，最大充電電流為2A.ASC8512 集成電流限制、短路保護(hù)，確保充電芯片安全工作。ASC8512 集成NTC 熱敏電阻接口，可以采集、處理電池的溫度信息，保證充電電池的安全工作溫度。 兩節(jié)鋰電池充電IC ASC8512特點(diǎn)： 1.充2節(jié)鋰離子和鋰聚合物電池 2.開關(guān)頻率達(dá)400K 3.充電電流最大可做2A 4.輸入電壓9V到18V 5.電池狀態(tài)檢測(cè) 6.恒壓充電電壓值可通過外接電阻微調(diào) 7.千分之五的充電電壓控制精度 5.防反向保護(hù)電路可防止電池電流倒灌 6.NTC 熱敏接口監(jiān)測(cè)電池溫度 7.LED充電狀態(tài)指示 8.工作環(huán)境溫度范圍：-20℃～70℃ 9.TSSOP-14 應(yīng)用領(lǐng)域：應(yīng)用 ●手持設(shè)備，包括醫(yī)療手持設(shè)備 ●Portable-DVD，PDA，移動(dòng)蜂窩電話及智能手機(jī) ●上網(wǎng)本、平板電腦、MID ●自充電電池組
上傳時(shí)間： 2013-11-06
上傳用戶：chfanjiang
Multiple-voltage electronics systems often requirecomplex supply voltage tracking or sequencing, whichif not met, can result in system faults or even permanentfailures in the fi eld. The design diffi culties in meetingthese requirements are often compounded in distributedpowerarchitectures where point-of-load (POL) DC/DCconverters or linear regulators are scattered across PCboard space, sometimes on different board planes. Theproblem is that power supply circuitry is often the lastcircuitry to be designed into the board, and it must beshoehorned into whatever little board real estate is left.Often, a simple, drop-in, fl exible solution is needed tomeet these requirements.
標(biāo)簽： 負(fù)載點(diǎn)電路 電源電壓 排序
上傳時(shí)間： 2013-10-08
上傳用戶：15071087253
Speed and accuracy don’t always go hand-in-handin DC/DC converter systems—that is, until now. TheLTC3811 is a dual output, fi xed frequency current modeDC/DC switching regulator controller designed for one oftoday’s most demanding power supply applications: highcurrent, low voltage processor core supplies.
上傳時(shí)間： 2013-11-21
上傳用戶：aix008
This collection of circuits was worked out between June1991 and July of 1994. Most were designed at customerrequest or are derivatives of such efforts. All representsubstantial effort and, as such, are disseminated here forwider study and (hopefully) use.1 The examples areroughly arranged in categories including power conversion,transducer signal conditioning, amplifiers and signalgenerators. As always, reader comment and questionsconcerning variants of the circuits shown may be addresseddirectly to the author.
標(biāo)簽： 測(cè)量 控制 實(shí)用電路 分
上傳時(shí)間： 2013-11-15
上傳用戶：凌云御清風(fēng)
鎖定放大是微弱信號(hào)檢測(cè)的重要手段。基于相關(guān)檢測(cè)理論，利用開關(guān)電容的開關(guān)實(shí)現(xiàn)鎖定放大器中乘法器的功能，提出開關(guān)電容和積分器相結(jié)合以實(shí)現(xiàn)相關(guān)檢測(cè)的方法，并設(shè)計(jì)出一種鎖定放大器。該鎖定放大器將微弱信號(hào)轉(zhuǎn)化為與之相關(guān)的方波，通過后續(xù)電路得到正比于被測(cè)信號(hào)的直流電平，為后續(xù)采集處理提供方便。測(cè)量數(shù)據(jù)表明鎖定放大器前級(jí)可將10-6 A的電流轉(zhuǎn)換為10-1 V的電壓，后級(jí)通過帶通濾波器級(jí)聯(lián)可將信號(hào)放大1×105倍。該方法在降低噪聲的同時(shí)，可對(duì)微弱信號(hào)進(jìn)行放大，線性度較高、穩(wěn)定性較好。 Abstract: Lock-in Amplifying（LIA）is one of important means for weak signal detection. Based on cross-correlation detection theory， switch in the swithched capacitor was used as multiplier of LIA， and a new method of correlation detection was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave， then DC proportional to measured signal was obtained through follow-up conditioning circuit， providing convenience for signal acquisition and processing. The measured data shows that the electric current（10-6 A） can be changed into voltage（10-1 V） by LIA， and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.
標(biāo)簽： 開關(guān)電容 鎖定放大器
上傳時(shí)間： 2013-11-29
上傳用戶：黑漆漆
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