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·詳細說明：MPEG2視頻編解碼程序-mpeg2 video frequency arranges the decoding procedure 文件列表: mpeg2視頻編解碼器 .................\bin .................\...\emu387 .................\...\mpeg2dec.
上傳時間： 2013-06-06
上傳用戶：adamszq
為了滿足現(xiàn)代高速通信中頻率快速轉(zhuǎn)換的需求，基于坐標旋轉(zhuǎn)數(shù)字計算（CORDIC，Coordinate Rotation Digital Computer）算法完成正交直接數(shù)字頻率合成（ODDFS，Orthogonal Direct Digital Frequency Synthesizer）電路設(shè)計方案。采用MATLAB和Xilinx System Generator開發(fā)工具搭建電路的系統(tǒng)模型，通過現(xiàn)場可編程門陣列（FPGA，F(xiàn)ield Programmable Gate Array）完成電路的寄存器傳輸級（RTL，Register Transfer Level）驗證，仿真結(jié)果表明電路設(shè)計具有很高的有效性和可行性。
上傳時間： 2013-11-09
上傳用戶：hfnishi
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(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)用相當廣泛，在生物醫(yī)學、光學、電學、材料科學等相關(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
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(shù)模轉(zhuǎn)換器 抖動
上傳時間： 2013-10-25
上傳用戶：banyou
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(huán)境 磁卡讀寫器
上傳時間： 2013-11-13
上傳用戶：dysyase
The MAX17600–MAX17605 devices are high-speedMOSFET drivers capable of sinking /sourcing 4A peakcurrents. The devices have various inverting and noninvertingpart options that provide greater flexibility incontrolling the MOSFET. The devices have internal logiccircuitry that prevents shoot-through during output-statchanges. The logic inputs are protected against voltagespikes up to +14V, regardless of VDD voltage. Propagationdelay time is minimized and matched between the dualchannels. The devices have very fast switching time,combined with short propagation delays (12ns typ),making them ideal for high-frequency circuits. Thedevices operate from a +4V to +14V single powersupply and typically consume 1mA of supply current.The MAX17600/MAX17601 have standard TTLinput logic levels, while the MAX17603 /MAX17604/MAX17605 have CMOS-like high-noise margin (HNM)input logic levels. The MAX17600/MAX17603 are dualinverting input drivers, the MAX17601/MAX17604 aredual noninverting input drivers, and the MAX17602 /MAX17605 devices have one noninverting and oneinverting input. These devices are provided with enablepins (ENA, ENB) for better control of driver operation.
標簽： 17600 MAX 數(shù)據(jù)資料
上傳時間： 2013-12-20
上傳用戶：zhangxin
Abstract: Many industrial/scientific/medical (ISM) band radio frequency (RF) products use crystal oscillators to generate areference for the phase-locked loop (PLL)-based local oscillator (LO). This tutorial provides a basic description of theISM-RF Crystal Calculator, which can be used to calculate various impacts on crystal frequency accuracy and startupmargin for such an LO.
上傳時間： 2013-11-15
上傳用戶：JasonC
Abstract: Alexander Graham Bell patented twisted pair wires in 1881. We still use them today because they work so well. In addition we have the advantage ofincredible computer power within our world. Circuit simulators and filter design programs are available for little or no cost. We combine the twisted pair and lowpassfilters to produce spectacular rejection of radio frequency interference (RFI) and electromagnetic interference (EMI). We also illustrate use of a precision resistorarray to produce a customizable differential amplifier. The precision resistors set the gain and common mode rejection ratios, while we choose the frequencyresponse.
上傳時間： 2014-11-26
上傳用戶：Vici
Abstract: This reference design provides a complete demonstration platform for using industrial/scientific/medical radio frequency
上傳時間： 2013-11-09
上傳用戶：LP06
With more and more multi-frequency clocks being used in today's chips, especially in the communications field, it is often necessary to switch the source of a clock line while the chip is running.
上傳時間： 2013-10-10
上傳用戶：1214209695
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