·目錄1. Radio SIGNALS on the move 12. Antenna basics 193. Wire, connection, grounds, and all that 494. Marconi and other unbalanced antennas 695. Doublets, dipoles, and other Hertzian antennas 876. Limit
標(biāo)簽： antenna toolkit nbsp 天線
上傳時(shí)間： 2013-06-14
上傳用戶：lingduhanya
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(biāo)簽： ADC 24位 心電圖 中的應(yīng)用
上傳時(shí)間： 2013-12-23
上傳用戶：sssl
The MAX4968/MAX4968A are 16-channel, high-linearity,high-voltage, bidirectional SPST analog switches with18I (typ) on-resistance. The devices are ideal for use inapplications requiring high-voltage switching controlledby a low-voltage control signal, such as ultrasound imagingand printers. The MAX4968A provides integrated40kI (typ) bleed resistors on each switch terminal todischarge capacitive loads. Using HVCMOS technology,these switches combine high-voltage bilateral MOSswitches and low-power CMOS logic to provide efficientcontrol of high-voltage analog SIGNALS.
標(biāo)簽： 4968 MAX 數(shù)據(jù)手冊(cè)
上傳時(shí)間： 2013-10-09
上傳用戶：yepeng139
隨著系統(tǒng)設(shè)計(jì)復(fù)雜性和集成度的大規(guī)模提高，電子系統(tǒng)設(shè)計(jì)師們正在從事100MHZ以上的電路設(shè)計(jì)，總線的工作頻率也已經(jīng)達(dá)到或者超過50MHZ，有一大部分甚至超過100MHZ。目前約80% 的設(shè)計(jì)的時(shí)鐘頻率超過50MHz，將近50% 以上的設(shè)計(jì)主頻超過120MHz，有20%甚至超過500M。當(dāng)系統(tǒng)工作在50MHz時(shí)，將產(chǎn)生傳輸線效應(yīng)和信號(hào)的完整性問題；而當(dāng)系統(tǒng)時(shí)鐘達(dá)到120MHz時(shí)，除非使用高速電路設(shè)計(jì)知識(shí)，否則基于傳統(tǒng)方法設(shè)計(jì)的PCB將無(wú)法工作。因此，高速電路信號(hào)質(zhì)量仿真已經(jīng)成為電子系統(tǒng)設(shè)計(jì)師必須采取的設(shè)計(jì)手段。只有通過高速電路仿真和先進(jìn)的物理設(shè)計(jì)軟件，才能實(shí)現(xiàn)設(shè)計(jì)過程的可控性。傳輸線效應(yīng)基于上述定義的傳輸線模型，歸納起來，傳輸線會(huì)對(duì)整個(gè)電路設(shè)計(jì)帶來以下效應(yīng)。 · 反射信號(hào)Reflected SIGNALS · 延時(shí)和時(shí)序錯(cuò)誤Delay & Timing errors · 過沖(上沖/下沖)Overshoot/Undershoot · 串?dāng)_Induced Noise (or crosstalk) · 電磁輻射EMI radiation
標(biāo)簽： 高速電路 傳輸線 效應(yīng)分析
上傳時(shí)間： 2013-11-16
上傳用戶：lx9076
Abstract: Rail splitting is creating an artificial virtual ground as a reference voltage. It is used to set the signalto match the op amp's "sweet spot." An op amp has the most linear- and distortion-free qualities at that sweetspot. Typically, the sweet spot occurs near the center between the single power rail and ground. In the case ofa number of SIGNALS, the virtual ground can control channel DC errors when multiplexing or switching theSIGNALS.
標(biāo)簽： 電源調(diào)整 虛擬地
上傳時(shí)間： 2013-10-23
上傳用戶：wushengwu
Linear Technology offers a variety of devices that simplifyconverting power from a USB cable, but the LTC®3455represents the highest level of functional integration yet. The LTC3455 seamlessly manages power flowbetween an AC adapter, USB cable and Li-ion battery,while complying with USB power standards, all from a4mm × 4mm QFN package. In addtion, two high efficiencysynchronous buck converters generate low voltage railswhich most USB-powered peripherals require. TheLTC3455 also provides power-on reset SIGNALS for themicroprocessor, a Hot SwapTM output for poweringmemory cards as well as an uncommitted gain blocksuitable for use as a low-battery comparator or an LDOcontroller. The PCB real estate required for the entire USBpower control circuit and two DC/DC converters is only225mm2.
上傳時(shí)間： 2013-11-02
上傳用戶：名爵少年
A frequent requirement in systems involves drivinganalog SIGNALS into non-linear or reactive loads. Cables,transformers, actuators, motors and sample-hold circuitsare examples where the ability to drive diffi cult loads isrequired. Although several power buffer amplifi ers areavailable, none have been optimized for driving diffi cultloads.
標(biāo)簽： 1010 LT 電源 中的應(yīng)用
上傳時(shí)間： 2014-12-24
上傳用戶：1109003457
Abstract: As electronic systems take over many of the mechanical functions in a car—ranging from engine timing to steering andbraking—there is a growing concern about fault tolerance. There should not be a single point of failure that would prevent a car fromat least "limping" off the road or making it to the nearest service station. Redundant systems, watchdog timers, and other controlcircuits are used to reroute SIGNALS and perform other functions that ensure that a vehicle can safely make it off the road when afailure occurs.
標(biāo)簽： 看門狗定時(shí)器 汽車安全系統(tǒng)
上傳時(shí)間： 2013-11-10
上傳用戶：diets
Demonstration circuit 1562A is an engineering toolto design and evaluate the LTC699X-X family ofTimerBlox circuits. The center section of the boardcontains a pre-configured TimerBlox function.DC1562A comes in twelve timing function variationsas outlined in Table 1.Surrounding the center board is a ”playground”prototyping area. The prototyping area has padsfor Dip-8, S8, MS8, or S6 packages with breadboarding connections to each pin and two convenientpower buses and ground bus surrounding theentire area. This area is for conditioning SIGNALS tocontrol the timer function and for adding loads controlled in time.
標(biāo)簽： 6994 LTC PCB 參考設(shè)計(jì)
上傳時(shí)間： 2013-10-18
上傳用戶：如果你也聽說
The MAX9257/MAX9258 programmable serializer/deserializer (SerDes) devices transfer both video data and control SIGNALS over the same twisted-pair cable. However, control data can only be transmitted during the vertical blank time, which is indicated by the control-channel-enabled output (CCEN) signal. The electronic control unit (ECU) firmware designer needs to know how quickly to respond to the CCEN signal before it times out and how to calculate this duration. This application note describes how to calculate the duration of the CCEN for the MAX9257/MAX9258 SerDes chipset. The calculation is based on STO timeout, clock frequency, and UART bit timing. The CCEN duration is programmable and can be closed if not in use.
標(biāo)簽： SerDes MAXX 9257 9258
上傳時(shí)間： 2014-01-24
上傳用戶：xingisme
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