InGaAs/AlGaAs semiconductor lasers come in threetypes: VCSELs and two types of EELs. The VCSEL, asits name implies, emits vertically, normal to the planeof the device, owing to cavity mirrors grown withinthe epitaxial material itself. The VCSEL’s circular beamhas a numerical aperture (NA) of roughly 0.2, or a fullangle of approximately 25 degrees.
標簽： tof
上傳時間： 2022-02-12
上傳用戶：
本書是 Marc Thompson 博士 20 年模擬電路設計和教學經驗的總結，講述了模擬電路與系統設計中常用的直觀分析方法。本書提出了“模擬電路直觀方法學”，力圖幫助學生和設計人員擺脫復雜的理論推導與計算，充分利用直觀知識來應對模擬電路工程設計挑戰。全書共分為 16 章，內容涵蓋了二極管、晶體管、放大器、濾波器、反饋系統等模擬電路的基本知識與設計方法。本書大綱第 1 章與第 2 章為介紹性材料。第 1 章是本書的引言，同時介紹了模擬電路設計的發展動機，其中引用了一些精選的歷史事件。第 2 章講述后續章節中用到地重要的信號處理概念，以使讀者們能夠跟上作者的思路。第 3 章至第 8 章講述雙極性器件的物理學原理、雙極性結型晶體管 (bipolar junction transistor, BJT) 、晶體管放大器，以及用于帶寬估計與開關速度分析的近似技術。第 9 章講述 CMOS 管和 CMOS 管放大器的基礎知識。前面章節介紹的用于放大器設計的帶寬估計技術也同樣適用于 CMOS 管器件。第 10 章講述 晶體管的開關效應。晶體管是如何實現導通和關閉呢？又如何估計它的開關速度呢？第 11 章回顧反饋系統 (feedback system) 的基本知識以及設計穩定反饋系統的伯德圖 / 相位裕度方法 (Bod plot / phase margin) 。第 12 章和第 13 章講述實際運算放大器的設計、使用和限制，包括電壓反饋 (voltage-feedback) 以及電流反饋 (current-feedback) 放大器。第 14 章講述模擬低通濾波器設計的基本知識，包括巴特沃思 (Butterworth) 、切比雪夫 (Chebyshev) 、橢圓 (elliptic) 以及貝塞爾 (Bessel) 濾波器的無源梯形實現和胡源實現。第 15 章講述實際電路設計問題，比如 PCB 版圖設計規則、無源器件的使用和限制等。第 16 章是一些有用的設計技術和設計技巧的大雜燴，這些內容又不適合放在其他章節，所以作為獨立的章節進行講述。一些說明性的分析問題以及 MATLAB 和 SPICE 設計示例點綴在全書的字里行間，以幫助讀者理解本書的內容。
標簽： 模擬電路
上傳時間： 2022-02-14
上傳用戶：
ADC模數轉換器件Altium Designer AD原理圖庫元件庫SV text has been written to file : 4.4 - ADC模數轉換器件.csvLibrary Component Count : 29Name Description----------------------------------------------------------------------------------------------------ADC0800 National 8-Bit Analog to Digital ConverterADC0809 ADC0831 ADCADC0832 ADC8 Generic 8-Bit A/D ConverterCLC532 High-Speed 2:1 Analog MultiplexerCS5511 National 16-Bit Analog to Digital ConverterDAC8 Generic 8-Bit D/A ConverterEL1501 Differential line Driver/ReceiverEL2082 Current-Mode MultiplierEL4083 Current Mode Four Quadrant MultiplierEL4089 DC Restored Video AmplifierEL4094 Video Gain Control/FaderEL4095 Video Gain Contol/Fader/MultiplexerICL7106 LMC6953_NSC PCI Local Bus Power SupervisorMAX4147 300MHz, Low-Power, High-Output-Current, Differential Line DriverMAX4158 350MHz 2-Channel Video Multiplexer-AmplifierMAX4159 350MHz 2-Channel Video Multiplexer-AmplifierMAX4258 250MHz, 2-Channel Video Multiplexer-AmplifierMAX4259 250MHz 2-Channel Video Multiplexer-AmplifierMAX951 Ultra-Low-Power, Single-Supply Op Amp + Comparator + ReferenceMAX952 Ultra-Low-Power, Single-Supply Op Amp + Comparator + ReferenceMC1496 Balanced Modulator/DemodulatorPLL100k Generic Phase Locked LoopPLL10k Generic Phase Locked LoopPLL5k Generic Phase Locked LoopPLLx Generic Phase Locked Loop水位計
標簽： adc 模數轉換 altium designer
上傳時間： 2022-03-13
上傳用戶：
該步進電機驅動器又稱為EasyDriver，EasyDriver能夠為兩級步進電機提供大約每相750mA（兩極一共1.5A）的驅動。它默認設置為8步細分模式（所以如果你的電機是每圈200步，你使用EasyDriver時默認為每圈1600步），更多細分模式可以通過將MS1或MS2兩個接腳接地進行設置。這是一種基于Allegro A3967驅動芯片的細分斷路器。對于此設計的完整規格，請查閱A3967的參數表。它的最大每相電流從150mA到750mA。可以采用的最大驅動電壓大概是30V，其中包括板載5V的調壓器，所以只需要一個電源。質優價廉，這玩意兒只要十幾美元，比你自己制作電路板更便宜。步進電機驅動器設計特色：· A3967 Microstepping Driver· MS1 and MS2 pins broken out to change microstepping resolution to full, half, quarter and eighth steps (defaults to eighth)· Compatible with 4, 6, and 8 wire stepper motors of any voltage· Adjustable current control from 150mA/phase to 700mA/phase· Power supply range from 6V to 30V. The higher the voltage, the higher the torque at high speeds
上傳時間： 2022-04-27
上傳用戶：
為解決移相全橋電路驅動及相角控制問題,設計了一種數字控制的移相全橋驅動電路.以TPL521為光耦隔離、IR2110為柵極驅動芯片.由DSP產生PWM信號,經過光耦隔離和邏輯電路后送至IR2110進行相角控制.文章對IR2110驅動電路原理進行分析及參數進行設計,對TMS320F28335進行設置并給出部分代碼.實驗結果表明：通過TMS320F28335可產生的不同相角的PWM波形,滿足了移相全橋對不同相角控制的要求.In order to solve the problem of phase-shifted full-bridge circuit driving and phase angle control,a digitally controlled phaseshifted full-bridge driving circuit was designed. TPL521 optocoupler isolation,IR2110 gate driver chip. PWM signals are generated by the DSP and sent to the IR2110 for phase angle control after optocoupler isolation and logic circuits. This text carries on the analysis to the principle of IR2110 drive circuit and parameter design,set up and give out some code to TMS320F28335. The experimental results show that the PWM waveforms with different phase angles generated by TMS320F28335 can meet the requirements of phase-shifted full-bridge control for different phase angles.
上傳時間： 2022-05-03
上傳用戶：zhanglei193
Abstract: A sliding mode observer and fractional-order phase-locked loop (FO-PLL) method is proposed for the sensorless speed control of a permanent magnet synchronous motor (PMSM).The saturation function is adopted in order to reduce the chattering phenomenon caused by the sliding mode observer. In this proposed FO-PLL, method, a regulable fractional order r is involved, which means that the FO-PLL provides an extra degree of freedom. In fact, the conventional phase-locked loop (PLL) applied in sensorless PMSM control can be seen as a special case of the proposed FO-PLL. By selecting a proper fractional order r a better performance may be achieved. The computer simulation results demonstrate the effectiveness of the proposed method.Key words: fractional calculus; fractional order phase-locked loop; sensorless control; sliding mode observer; permanent magnet synchronous motor; speed controll
上傳時間： 2022-06-18
上傳用戶：
一.基礎理論鎖相環路（Phase Locked Loop）是一個閉環的相位控制系統，它的輸出信號的相位能自動跟蹤輸入信號相位。系統框圖如下：當0，（1）與0：（1）相等時，兩矢量以相同的角速度旋轉，相對位置，即夾角維持不變，通常數值又較小，這就是環路的鎖定狀態。從輸入信號加到鎖相環路的輸入端開始，一直到環路達到鎖定的全過程，稱為捕獲過程。設系統最初進入同步狀態[2nrtto，e，.]的時間為1。。那么從1=1，的起始狀態到達進入同步狀態的全部過程就稱為鎖相環路的捕獲過程。捕獲過程所需的時間T，=1，-1，稱為捕獲時間。顯然，捕獲時間T，的大小不但與環路的參數有關，而且與起始狀態有關。對一定的環路來說，是否能通過捕獲而進入同步完全取決于起始頻差8.（4）-Ao。。若Ao，超過某一范圍，環路就不能捕獲了。這個范圍的大小是鎖相環路的一個重要性能指標，稱為環路的捕獲帶Ao，。
標簽： 射頻鎖相環
上傳時間： 2022-06-21
上傳用戶：
·Overview:20 minutes-Introduction and Objectives-Motor Control Development Toolbox:Library blocks,FreeMASTER, and Bootloader·Hands-On Demo:50 minutes-Motor Kit(Describe Freescale 3-Phase Motor Kit)-Convert simple model to run on Motor Kit with MCD Toolbox and use FreeMASTER·Model Based Design:10 minutes-Model Based Design Steps:Simulation,SIL,PIL and ISO 26262-SIL/PIL Hands-On Demo Step 2& 3 of MBD·Motor Control:20 minutes-FOC Sensor-less control and how to use it to turn a motor·Motor Control Hands-On Demo:80 minutes-Implement FOC Sensor-less Motor Control on Motor Kit-Run software from the model and use FreeMASTER to monitor·Summary and Q&A:10 minutes
上傳時間： 2022-06-24
上傳用戶：
The GD32F103xx device is a 32-bit general-purpose microcontroller based on the ARM?Cortex?-M3 RISC core with best ratio in terms of processing power, reduced power consumption and peripheral set. The Cortex?-M3 is a next generation processor core whichis tightly coupled with a Nested Vectored Interrupt Controller (NVIC), SysTick timer and advanced debug support.The GD32F103xx device incorporates the ARM ' Cortex?-M3 32-bit processor core operating at 108 MHz frequency with Flash accesses zero wait states to obtain maximumefficiency. It provides up to 3 MB on-chip Flash memory and up to 96 KB SRAM memory. An extensive range of enhanced I/Os and peripherals connected to two APB buses. The devices offer up to three 12-bit ADCs, up to two 12-bit DACs, up to ten general-purpose
標簽： gd32f103
上傳時間： 2022-07-23
上傳用戶：aben
3-phase Sensor-less Fan Motor DriverAM2355NThe AM2355N is a 3-phase sensor-less DC fan motor driver IC. It senses the BEMF (BackElectro-Motive Force) of the motor in rotation and provides corresponding commutation current tothe motor. Rotation speed can be controlled by PWM input signal. The drivers include LockDetection, Thermal Shutdown, and Over-current Protection. Forward and Reverse control.www.junmintech.com
標簽： am2355n
上傳時間： 2022-07-26
上傳用戶：
