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High-frequency

  • 03 California PhD High integrity GPS-INS filter for precise relative navigation.pdf

    資料->【E】光盤論文->【E1】斯坦福博士論文->03 California PhD High integrity GPS-INS filter for precise relative navigation.pdf

    標簽: California navigation integrity relative

    上傳時間: 2013-07-03

    上傳用戶:jiiszha

  • FPGA-based high-order FIR filter design

    FPGA-based high-order FIR filter design

    標簽: FPGA-based high-order filter design

    上傳時間: 2013-08-06

    上傳用戶:sssnaxie

  • High-Speed Digital System Design

    Introduce High-Speed Digital System Design.

    標簽: High-Speed Digital Design System

    上傳時間: 2013-10-20

    上傳用戶:gps6888

  • 2012TI電子設(shè)計大賽——微弱信號檢測裝置

    微弱信號檢測裝置 四川理工學(xué)院 劉鵬飛、梁天德、曾學(xué)明 摘要: 本設(shè)計以TI的Launch Pad為核心板,采用鎖相放大技術(shù)設(shè)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(shù)字顯示出所測信號相應(yīng)的幅度值。實驗結(jié)果顯示其抗干擾能力強,測量精度高。 關(guān)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(xiàn)代科學(xué)技術(shù)的發(fā)展,在科研與生產(chǎn)過程中人們越來越需要從復(fù)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(dāng)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(shù)的應(yīng)用相當(dāng)廣泛,在生物醫(yī)學(xué)、光學(xué)、電學(xué)、材料科學(xué)等相關(guān)領(lǐng)域顯得愈發(fā)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(diào)節(jié),但其噪聲抑制能力有限,同時其準確性與穩(wěn)定性將大打折扣。

    標簽: 2012 TI 電子設(shè)計大賽 微弱信號

    上傳時間: 2013-11-04

    上傳用戶:lty6899826

  • 射頻集成電路設(shè)計John Rogers(Radio Freq

    Radio Frequency Integrated Circuit Design I enjoyed reading this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of microwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog integrated circuit designers in the past workedon applications at low enough frequency that microwave issues did not arise.As a consequence, they were adept at lumped parameter circuits and often notcomfortable with circuits where waves travel in space. However, in order todesign radio frequency (RF) communications integrated circuits (IC) in thegigahertz range, one must deal with transmission lines at chip interfaces andwhere interconnections on chip are far apart. Also, impedance matching isaddressed, which is a topic that arises most often in microwave circuits. In mycareer, there has been a gap in comprehension between analog low-frequencydesigners and microwave designers. Often, similar issues were dealt with in twodifferent languages. Although this book is more firmly based in lumped-elementanalog circuit design, it is nice to see that microwave knowledge is brought inwhere necessary.Too many analog circuit books in the past have concentrated first on thecircuit side rather than on basic theory behind their application in communications.The circuits usually used have evolved through experience, without asatisfying intellectual theme in describing them. Why a given circuit works bestcan be subtle, and often these circuits are chosen only through experience. Forthis reason, I am happy that the book begins first with topics that require anintellectual approach—noise, linearity and filtering, and technology issues. Iam particularly happy with how linearity is introduced (power series). In therest of the book it is then shown, with specific circuits and numerical examples,how linearity and noise issues arise.

    標簽: Rogers Radio John Freq

    上傳時間: 2014-12-23

    上傳用戶:han_zh

  • MR16 LED驅(qū)動MR16 LED燈與電子變壓器兼容

    Abstract: There are differences between the operation of low-frequency AC transformers and electronic transformersthat supply current to MR16 lamps, and there are also differences in the current draw for MR16 halogen lamps andMR16 LED lamps. These contrasts typically prevent an MR16 LED lamp from operating with most electronictransformers. This article explains how a high-brightness (HB) LED driver optimized for MR16 lamps will allow LEDlamps to be compatible with most electronic transformers.A similar version of this article appeared on Display Plus, July 7, 2012 and in German in Elektronikpraxis, October 1,2012.

    標簽: LED MR 16 驅(qū)動

    上傳時間: 2013-10-14

    上傳用戶:playboys0

  • 如何設(shè)計一個高效率的DC-DC轉(zhuǎn)換器

    Abstract: The DS1875 features a pulse-width modulation (PWM) controller that can be used to control aDC-DC converter. The DC-DC converter can then be used to generate the high bias voltages necessaryfor avalanche photodiodes (APDs). This application note describes the operation of a boost converterthat uses the DS1875. Discussion covers the selection of the inductor and switching frequency, and theselection of components that improve the efficiency of the converter. Test data are presented.

    標簽: DC-DC 如何設(shè)計 高效率 轉(zhuǎn)換器

    上傳時間: 2013-10-26

    上傳用戶:lyson

  • Achieving High Power Density Designs

    Achieving High Power Density Designs

    標簽: Achieving Density Designs Power

    上傳時間: 2013-10-12

    上傳用戶:qazxsw

  • 100-15V TO 12V DCDC 原理圖 PCB BOM表

    高的工作電壓高達100V N雙N溝道MOSFET同步驅(qū)動 The D810DCDC is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The D810DCDC uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit, without requiring a sense resistor. A precise internal reference provides 0.5% DC accuracy. A high bandwidth (25MHz) error amplifi er provides very fast line and load transient response. Large 1Ω gate drivers allow the D810DCDC to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. Integrated bias control generates gate drive power from the input supply during start-up and when an output shortcircuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher effi ciency.

    標簽: DCDC 100 12V BOM

    上傳時間: 2013-10-24

    上傳用戶:wd450412225

  • 超低功率轉(zhuǎn)換器的控制方案消除開關(guān)噪聲

      An essential component of a noise-free audio device isa clean power supply, but few switching regulators canoperate at high efficiency while keeping the switchingfrequency out of the audio band. The LTC®3620 fills thisvoid. It is a high efficiency 15mA buck regulator with aprogrammable minimum switching frequency, making itpossible to virtually eliminate audible switching noise. Theinternal synchronous switches and low quiescent currentof this buck regulator provide the ability to maintain highefficiency, while its small footprint makes it ideal for tiny,low power audio applications.

    標簽: 超低功率 控制 開關(guān)噪聲 方案

    上傳時間: 2013-10-21

    上傳用戶:非衣2016

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