根據基帶成型濾波器的工作原理,文中設計出了一種基帶成型濾波器的數字實現方案。該方案首先運用MATALB仿真工具得到信號基帶成型后的仿真數據,并將仿真數據存儲在FPGA中,然后通過查表操作實現了數字基帶成型濾波器的功能。文中還給出了通過MODELSIM得到的信號基帶成型后的仿真結果,仿真結果表明,由該方案所設計的基帶成型濾波器可以很好地完成通信系統中信號的成型特性。
上傳時間: 2013-11-09
上傳用戶:563686540
自適應信號處理的理論和技術已經成為人們常用濾波和去噪技術。文中講述了自適應濾波的原理以及LMS算法和RLS算法兩種基本自適應算法的原理及步驟。并用MATLAB分別對兩種算法進行了自適應濾波仿真和實現。
上傳時間: 2013-11-26
上傳用戶:1051290259
探地雷達回波信號是一種非平穩非線性信號,其中不僅包含地下埋藏物的目標信號,還包含有可能掩藏目標信號的直達波信號,給目標的識別帶來困難。文中采用HHT方法對探地雷達回波信號進行特征分析,提取回波信號的IMF分量的瞬時頻率作為特征向量。實驗結果表明,用HHT方法提取特征可較好的避免直達波影響,該方法是可行而有效的,為進一步鑒別地下埋藏物提供了新的思想和方法。
上傳時間: 2013-10-22
上傳用戶:hjkhjk
浮點運算器的核心運算部件是浮點加法器,它是實現浮點指令各種運算的基礎,其設計優化對于提高浮點運算的速度和精度相當關鍵。文章從浮點加法器算法和電路實現的角度給出設計方法,通過VHDL語言在QuartusII中進行設計和驗證,此加法器通過狀態機控制運算,有效地降低了功耗,提高了速度,改善了性能。
上傳時間: 2014-01-19
上傳用戶:xauthu
電磁導波檢測技術因其非接觸耦合的特性已被廣泛應用于各種金屬管道無損檢測領域中,但導波的激勵脈沖群重復頻率的確定長久以來卻沒有一個有效的解決方法。為此,本文提出了以有、無缺陷的重復脈沖群檢測信號的相關性作為判別標準,選取電磁導波激勵脈沖群最佳重復頻率,并從檢測信號特征提取和識別的角度驗證了本文選取的激勵脈沖群最佳重復頻率可有效提高導波檢測信號之間的區分度,減小檢測信號間的干擾,提高缺陷識別的準確性。
上傳時間: 2013-11-04
上傳用戶:ywcftc277
Abstract: What can be simpler than designing with CMOS and BiCMOS? These technologies are very easy to use butthey still require careful design. This tutorial discusses the odd case of circuits that seem to work but exhibit somepeculiar behaviors—including burning the designer's fingers!
上傳時間: 2013-11-03
上傳用戶:dick_sh
Abstract: Perfection is relative and application specific. The perfect race car is not the car we use to commute to work. We need products for everyday use that are high quality, affordable, and solidly reliable. There will be times when we must use components that are not perfect, and this is when calibration becomes important. Calibration techniques reduce tolerances in imperfect manufacturing equipment while maintaining affordability.
標簽: 校準
上傳時間: 2013-10-09
上傳用戶:哈哈hah
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.
上傳時間: 2013-12-20
上傳用戶:zhangxin
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.
上傳時間: 2013-10-09
上傳用戶:yepeng139
在非相參雷達測試系統中,頻率合成技術是其中的關鍵技術.針對雷達測試系統的要求,介紹了一種用DDS激勵PLL的X波段頻率合成器的設計方案。文中給出了主要的硬件選擇及具體電路設計,通過對該頻率合成器的相位噪聲和捕獲時間的分析,及對樣機性能的測試,結果表明該X波段頻率合成器帶寬為800 MHz、輸出相位噪聲優于-80 dBc/Hz@10 kHz、頻率分辨率達0.1 MHz, 可滿足雷達測試系統系統的要求。測試表明,該頻率合成器能產生低相噪、高分辨率、高穩定度的X波段信號,具有較好的工程應用價值。
上傳時間: 2013-10-21
上傳用戶:pkkkkp