Wavelength division multiplexing (WDM) refers to a multiplexing and transmission scheme in optical telecommunications fibers where different wavelengths, typically emitted by several lasers, are modulated independently (i.e., they carry independent information from the transmitters to the receivers). These wavelengths are then multiplexed in the transmitter by means of passive WDM filters, and likewise they are separated or demultiplexed in the receiver by means of the same filters or coherent detection that usually involves a tunable local oscillator (laser).
标签： Multiplexing Wavelength Division
上传时间： 2020-06-01
上传用户：shancjb
This design uses Common-Emitter Amplifier (Class A) with 2N3904 Bipolar Junction Transistor. Use “Voltage Divider Biasing” to reduce the effects of varying β (= ic / ib) (by holding the Base voltage constant) Base Voltage (Vb) = Vcc * [R2 / (R1 + R2)] Use Coupling Capacitors to separate the AC signals from the DC biasing voltage (which only pass AC signals and block any DC component). Use Bypass Capacitor to maintain the Q-point stability. To determine the value of each component, first set Q-point close to the center position of the load line. (RL is the resistance of the speaker.)
上传时间： 2020-11-27
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黑金CYCLONE4 EP4CE6F17C8 FPGA开发板ALTIUM设计硬件工程（原理图+PCB+AD集成封装库）,Altium Designer 设计的工程文件，包括完整的原理图及PCB文件，可以用Altium(AD)软件打开或修改，可作为你产品设计的参考。集成封装器件型号列表：Library Component Count : 50Name Description----------------------------------------------------------------------------------------------------1117-3.3 24LC04B_0 4148 BAV99 CAP NP_Dup2CAP NP_Dup2_1 CAP NP_Dup2_2CP2102_0 C_Dup1 C_Dup1_1C_Dup2 C_Dup3 C_Dup4 C_Dup4_1 Circuit Breaker Circuit BreakerConnector 15 Receptacle Assembly, 15-Pin, Sim Line ConnectorDS1302_8SO EC EP4CE6F17C8 Cyclone IV Family FPGA, 2V Core, 179 I/O Pins, 2 PLLs, 256-Pin FBGA, Speed Grade 8, Commercial GradeEP4CE6F17C8_1 Cyclone IV Family FPGA, 2V Core, 179 I/O Pins, 2 PLLs, 256-Pin FBGA, Speed Grade 8, Commercial GradeFuse 2 FuseHEX6HY57651620/SO_0 Header 2 Header, 2-PinHeader 9X2 Header, 9-Pin, Dual rowINDUCTOR JTAG-10_Dup1 KEYB LED LED_Dup1 M25P16-VMN3PB 16 Mb (x1) Automotive Serial NOR Flash Memory, 75 MHz, 2.7 to 3.6 V, 8-pin SO8 Narrow (MN), TubeMHDR2X20 Header, 20-Pin, Dual rowMiniUSBB OSCPNP R RESISTOR RN RN_Dup1 R_Dup1 R_Dup2 R_Dup3 R_Dup5R_Dup6 SD SPEAKERSRV05-4SW KEY-DPDT ZTAbattery
标签： 黑金 cyclone4 ep4ce6f17c8 fpga
上传时间： 2021-12-22
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高通(Qualcomm)蓝牙芯片QCC5151_硬件设计详细指导书（官方内部培训手册）共52页其内容是针对硬件设计、部分重要元器件选择(ESD，Filter）及走线注意事项的详细说明。2 Power management 2.1 SMPS 2.1.1 Components specification 2.1.2 Input power supply selection 2.1.3 Minimize SMPS EMI emissions 2.1.4 Internal LDOs and digital core decoupling 2.1.5 Powering external components 2.2 Charger 2.2.1 Charger connections.2.2.2 General charger operation2.2.3 Temperature measurement during charging 2.3 SYS_CTRL 3 Bluetooth radio3.1 RF PSU component choice 3.2 RF band-pass filter3.3 Layout (天线 走线的注意事项)4 Audio4.1 Audio bypass capacitors 4.2 Earphone speaker output4.3 Line/Mic input 4.4 Headphone output optimizition5 LED pads 5.1 LED driver 5.2 Digital/Button input 5.3 Analog input5.4 Disabled 6 Reset pin (Reset#)7 QSPIinterface 8 USB interfaces 8.1 USB device port8.1.1 USB connections8.1.2 Layout notes8.1.3 USB charger detection
上传时间： 2022-01-24
上传用户：XuVshu
PW1555 is a programmable current limit switch with input voltage range selection and outputvoltage clamping. Extremely low RDS(ON) of the integrated protection N-channel FET helps toreduce power loss during the normal operation. Programmable soft-start time controls the slew rateof the output voltage during the start-up time. Independent enable control allows the complicatedsystem sequencing control. It integrates the over-temperature protection shutdown andautorecovery with hystersis
标签： pw1555
上传时间： 2022-02-14
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USB音频方案,USB声卡方案1. 描述ATE1133是一颗包含音频编解码器、HIFI级单麦克风输入和立体声耳机输出解决方案。内部集成多个模块，包括高速&全速USB Host/Device收发器(PHY)，ARM??Cortex?-M4?32-bit?MCU内核主频96MHZ，16bit ADC采样率：48、96KHZ、16bit DAC采样率：48、96KHZ，支持标准安卓耳机线控按键控制，支持美标CTIA带耳机插拔检测。它非常适用于USB C型桌面拓展坞、数据音频HUB、视频会议、Type-c耳机、C型音频转接头、USB话务耳机、USB车载AUX音频线等应用。此外还支持上位机Windows PC端软件界面在线调试仿真和更新片内flash闪存。2.特点·符合USB 2.0全速运行·符合USB AUDIO & HID设备类规范·支持Headset模式·支持Microphone模式·支持Speaker模式·支持硬件设置三种模式切换·支持左右声道平衡·麦克风Audio-ADC参数： 采样率：48、96KHZ 位宽：16Bit THD+N=0.005% SNR≥98 Bias电压：3V·立体声耳机输出Audio-DAC参数： 采样率：48、96KHZ 位宽：16Bit THD+N=0.003%(RL=32Ω) RL输出摆幅=1.6V 直驱16/32Ω耳机，最大功率35mW·内置低功耗ARM核心，全速运行功耗=3.3V@18ma，功耗0.06mW·支持线控耳机模式：上一曲、下一曲、播放/暂停、点按音量加减、长按音量连续加减·芯片单电源供电：3.3~5V-MAX·32针脚QFN32 4X4 封装
上传时间： 2022-03-22
上传用户：shjgzh
对某四轮独立驱动电动汽车轮毂电机进行研究,设计一种永磁无刷直流电机控制器.以STM32F103RBT6芯片为基础,对电机驱动电路、采样电路和保护电路分别进行硬件设计与分析;同时,采用模块化软件设计方案,对该控制器的软件系统进行升级.实验验证表明:所设计的电机控制器能使电机响应迅速、转速稳定、无超调,且电动车动力输出性能良好.A permanent magnet brushless direct current motor controller was designed by studying the hub motor of a four-wheel independent drive electric vehicle.Based on STM32 F103RBT6 chip,the hardware design and analysis of motor drive circuit,sampling circuit and protection circuit were carried out respectively.At the same time,modular software design scheme was adopted to upgrade the software system of the controller.Experimental results show that the designed motor controller can ensure the motor fast response,stable speed,no overshoot,and good power output performances.
上传时间： 2022-03-26
上传用户：qingfengchizhu
实验教学一直是工科教学中不可或缺的组成部分,对培养学生的动手能力,独立思考能力,创新思维与发散思维具有重要的作用。针对目前电路教学实验中电路仿真实验与实物电路实验各自独立,无法统一问题,提出将仿真电路实验与实物电路实验有机的结合同步操作,并使用Web发布实现远程实验操作。采用Multisim作为电路实验仿真平台,NI Eiviss II作为实物电路实验硬件平台,运用LabVIEW整合Multisim电路仿真实验与实物电路实验,实现仿真与实物实验有机结合,两种实验可同步进行。学生在仿真实验中先可探索实验,然后做实物实验。同时运用LabVIEW开发出实验过程人机交互操作接口界面,使用过程中效果良好。Experimental teaching has always been an indispensable part of engineering education.And it always plays an important role in cultivating students'practical ability,independent thinking ability,innovative thinking and divergent thinking.But simulation experiment and physical experiment cannot be unified in the circuit teaching experiment at present.In order to solve this problem,this paper proposes to combine organically the simulation circuit experiment with physical circuit experiment,and synchronously operate them.This paper uses the WEB publishing to achieve remote experimental operation.Multisim is used as the circuit simulation platform,and NI Eiviss II is used as the physical circuit hardware platform.Multisim circuit simulation experiment and physical circuit experiment are implemented by LabVIEW to realize the combination of simulation experiment and physical experiment.Students do explore experiments in simulation experiment firstly,and then do physical experiment.And this paper uses LabVIEW to develop the experimental man-machine interface.
上传时间： 2022-04-05
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高通(Qualcomm)蓝牙芯片QCC5144_硬件设计详细指导书（官方内部培训手册）其内容是针对硬件设计、部分重要元器件选择(ESD，Filter）及走线注意事项的详细说明。2 Power management 2.1 SMPS 2.1.1 Components specification 2.1.2 Input power supply selection 92.1.3 Minimize SMPS EMI emissions 2.1.4 Internal LDOs and digital core decoupling 2.1.5 Powering external components 2.2 Charger 2.2.1 Charger connections.2.2.2 General charger operation2.2.3 Temperature measurement during charging 2.3 SYS_CTRL 3 Bluetooth radio3.1 RF PSU component choice 3.2 RF band-pass filter3.3 Layout (天线 走线的注意事项)4 Audio4.1 Audio bypass capacitors 4.2 Earphone speaker output4.3 Line/Mic input 4.4 Headphone output optimizition5 LED pads 5.1 LED driver 5.2 Digital/Button input 5.3 Analog input5.4 Disabled 6 Reset pin (Reset#)7 USB interfaces7.1 USB device port7.1.1 USB device port7.1.2 Layout notes 7.1.3 USB charger detectionA QCC5144 VFBGA example schematic and BOM B Recommended SMPS components specificationB.1 Inductor specifition B.2 Recommended inductors B.3 SMPS capacitor specifition
上传时间： 2022-04-07
上传用户：默默
在疫情下，世界各国都面对着严峻的挑战，人民的生活模式和商业模式都因为疫情爆发而需要作出改变，例如减少人流在外的活动和时间，减少社交活动等，以降低因为人与人之间的接触而导致的病毒传播风险。 疫情期间，大多数人与人之间的社交活动已经停止，但社会的商业活动还是一直在进行， 这避免不了会产生人与人之间的互动和接触。为了减少人与人之间的接触，我们只好使用互联网来保持人与人和公司与公司之间的商业交往，从而使商业活动在疫情期间可以继续进行。 目前，最普遍的是使用电脑或手机连接互联网，经过大气电波可以听到对方的声音和看见对方的影像。这种方式在个人对个人的互联网连接使用是足够，而且效果也不错。但如果在公司对公司的会议中，各有一大群人围在一起进行会议，单纯电脑与电脑或手机与手机的连接，出来的效果恐怕不会好。 首先，传统电脑和手机在原始设计的时候，只针对个人应用，它并没有预计在今天疫情期间，公司之间会广泛的用它来做群组会议的功能。其二，电脑的收音只是固定在特定的方向，会议期间不同的人在不同的方向讲话，它的拾音能力绝对不能满足需求。其三，电脑和手机没有使用专门的语音芯片做语音处理，会议期间会出现杂音，啸叫，拾音不良 … …等等的情况，严重影响会议的质量和效果。 因此，选用一个带有专门语音处理功能的外置拾音speaker，对会议的质量会大大提升。本文会对这产品的要求做详细的介绍。
上传时间： 2022-04-11
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