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).
標(biāo)簽： Multiplexing Wavelength Division
上傳時(shí)間： 2020-06-01
上傳用戶：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.)
標(biāo)簽： 音頻放大器設(shè)計(jì) 電路圖 英文
上傳時(shí)間： 2020-11-27
上傳用戶：
黑金CYCLONE4 EP4CE6F17C8 FPGA開發(fā)板ALTIUM設(shè)計(jì)硬件工程（原理圖+PCB+AD集成封裝庫(kù)）,Altium Designer 設(shè)計(jì)的工程文件，包括完整的原理圖及PCB文件，可以用Altium(AD)軟件打開或修改，可作為你產(chǎn)品設(shè)計(jì)的參考。集成封裝器件型號(hào)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
標(biāo)簽： 黑金 cyclone4 ep4ce6f17c8 fpga
上傳時(shí)間： 2021-12-22
上傳用戶：
高通(Qualcomm)藍(lán)牙芯片QCC5151_硬件設(shè)計(jì)詳細(xì)指導(dǎo)書（官方內(nèi)部培訓(xùn)手冊(cè)）共52頁(yè)其內(nèi)容是針對(duì)硬件設(shè)計(jì)、部分重要元器件選擇(ESD，F(xiàn)ilter）及走線注意事項(xiàng)的詳細(xì)說(shuō)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 (天線 走線的注意事項(xiàng))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
標(biāo)簽： qualcomm 藍(lán)牙芯片 qcc5151
上傳時(shí)間： 2022-01-24
上傳用戶：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
標(biāo)簽： pw1555
上傳時(shí)間： 2022-02-14
上傳用戶：
USB音頻方案,USB聲卡方案1. 描述ATE1133是一顆包含音頻編解碼器、HIFI級(jí)單麥克風(fēng)輸入和立體聲耳機(jī)輸出解決方案。內(nèi)部集成多個(gè)模塊，包括高速&全速USB Host/Device收發(fā)器(PHY)，ARM??Cortex?-M4?32-bit?MCU內(nèi)核主頻96MHZ，16bit ADC采樣率：48、96KHZ、16bit DAC采樣率：48、96KHZ，支持標(biāo)準(zhǔn)安卓耳機(jī)線控按鍵控制，支持美標(biāo)CTIA帶耳機(jī)插拔檢測(cè)。它非常適用于USB C型桌面拓展塢、數(shù)據(jù)音頻HUB、視頻會(huì)議、Type-c耳機(jī)、C型音頻轉(zhuǎn)接頭、USB話務(wù)耳機(jī)、USB車載AUX音頻線等應(yīng)用。此外還支持上位機(jī)Windows PC端軟件界面在線調(diào)試仿真和更新片內(nèi)flash閃存。2.特點(diǎn)·符合USB 2.0全速運(yùn)行·符合USB AUDIO & HID設(shè)備類規(guī)范·支持Headset模式·支持Microphone模式·支持Speaker模式·支持硬件設(shè)置三種模式切換·支持左右聲道平衡·麥克風(fēng)Audio-ADC參數(shù)： 采樣率：48、96KHZ 位寬：16Bit THD+N=0.005% SNR≥98 Bias電壓：3V·立體聲耳機(jī)輸出Audio-DAC參數(shù)： 采樣率：48、96KHZ 位寬：16Bit THD+N=0.003%(RL=32Ω) RL輸出擺幅=1.6V 直驅(qū)16/32Ω耳機(jī)，最大功率35mW·內(nèi)置低功耗ARM核心，全速運(yùn)行功耗=3.3V@18ma，功耗0.06mW·支持線控耳機(jī)模式：上一曲、下一曲、播放/暫停、點(diǎn)按音量加減、長(zhǎng)按音量連續(xù)加減·芯片單電源供電：3.3~5V-MAX·32針腳QFN32 4X4 封裝
標(biāo)簽： ate1133 音頻 解碼芯片 usb typec
上傳時(shí)間： 2022-03-22
上傳用戶：shjgzh
對(duì)某四輪獨(dú)立驅(qū)動(dòng)電動(dòng)汽車輪轂電機(jī)進(jìn)行研究,設(shè)計(jì)一種永磁無(wú)刷直流電機(jī)控制器.以STM32F103RBT6芯片為基礎(chǔ),對(duì)電機(jī)驅(qū)動(dòng)電路、采樣電路和保護(hù)電路分別進(jìn)行硬件設(shè)計(jì)與分析;同時(shí),采用模塊化軟件設(shè)計(jì)方案,對(duì)該控制器的軟件系統(tǒng)進(jìn)行升級(jí).實(shí)驗(yàn)驗(yàn)證表明:所設(shè)計(jì)的電機(jī)控制器能使電機(jī)響應(yīng)迅速、轉(zhuǎn)速穩(wěn)定、無(wú)超調(diào),且電動(dòng)車動(dòng)力輸出性能良好.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.
標(biāo)簽： 電動(dòng)汽車 永磁無(wú)刷直流電機(jī)
上傳時(shí)間： 2022-03-26
上傳用戶：qingfengchizhu
實(shí)驗(yàn)教學(xué)一直是工科教學(xué)中不可或缺的組成部分,對(duì)培養(yǎng)學(xué)生的動(dòng)手能力,獨(dú)立思考能力,創(chuàng)新思維與發(fā)散思維具有重要的作用。針對(duì)目前電路教學(xué)實(shí)驗(yàn)中電路仿真實(shí)驗(yàn)與實(shí)物電路實(shí)驗(yàn)各自獨(dú)立,無(wú)法統(tǒng)一問(wèn)題,提出將仿真電路實(shí)驗(yàn)與實(shí)物電路實(shí)驗(yàn)有機(jī)的結(jié)合同步操作,并使用Web發(fā)布實(shí)現(xiàn)遠(yuǎn)程實(shí)驗(yàn)操作。采用Multisim作為電路實(shí)驗(yàn)仿真平臺(tái),NI Eiviss II作為實(shí)物電路實(shí)驗(yàn)硬件平臺(tái),運(yùn)用LabVIEW整合Multisim電路仿真實(shí)驗(yàn)與實(shí)物電路實(shí)驗(yàn),實(shí)現(xiàn)仿真與實(shí)物實(shí)驗(yàn)有機(jī)結(jié)合,兩種實(shí)驗(yàn)可同步進(jìn)行。學(xué)生在仿真實(shí)驗(yàn)中先可探索實(shí)驗(yàn),然后做實(shí)物實(shí)驗(yàn)。同時(shí)運(yùn)用LabVIEW開發(fā)出實(shí)驗(yàn)過(guò)程人機(jī)交互操作接口界面,使用過(guò)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.
上傳時(shí)間： 2022-04-05
上傳用戶：
高通(Qualcomm)藍(lán)牙芯片QCC5144_硬件設(shè)計(jì)詳細(xì)指導(dǎo)書（官方內(nèi)部培訓(xùn)手冊(cè)）其內(nèi)容是針對(duì)硬件設(shè)計(jì)、部分重要元器件選擇(ESD，F(xiàn)ilter）及走線注意事項(xiàng)的詳細(xì)說(shuō)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 (天線 走線的注意事項(xiàng))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
上傳時(shí)間： 2022-04-07
上傳用戶：默默
在疫情下，世界各國(guó)都面對(duì)著嚴(yán)峻的挑戰(zhàn)，人民的生活模式和商業(yè)模式都因?yàn)橐咔楸l(fā)而需要作出改變，例如減少人流在外的活動(dòng)和時(shí)間，減少社交活動(dòng)等，以降低因?yàn)槿伺c人之間的接觸而導(dǎo)致的病毒傳播風(fēng)險(xiǎn)。 疫情期間，大多數(shù)人與人之間的社交活動(dòng)已經(jīng)停止，但社會(huì)的商業(yè)活動(dòng)還是一直在進(jìn)行， 這避免不了會(huì)產(chǎn)生人與人之間的互動(dòng)和接觸。為了減少人與人之間的接觸，我們只好使用互聯(lián)網(wǎng)來(lái)保持人與人和公司與公司之間的商業(yè)交往，從而使商業(yè)活動(dòng)在疫情期間可以繼續(xù)進(jìn)行。 目前，最普遍的是使用電腦或手機(jī)連接互聯(lián)網(wǎng)，經(jīng)過(guò)大氣電波可以聽(tīng)到對(duì)方的聲音和看見(jiàn)對(duì)方的影像。這種方式在個(gè)人對(duì)個(gè)人的互聯(lián)網(wǎng)連接使用是足夠，而且效果也不錯(cuò)。但如果在公司對(duì)公司的會(huì)議中，各有一大群人圍在一起進(jìn)行會(huì)議，單純電腦與電腦或手機(jī)與手機(jī)的連接，出來(lái)的效果恐怕不會(huì)好。 首先，傳統(tǒng)電腦和手機(jī)在原始設(shè)計(jì)的時(shí)候，只針對(duì)個(gè)人應(yīng)用，它并沒(méi)有預(yù)計(jì)在今天疫情期間，公司之間會(huì)廣泛的用它來(lái)做群組會(huì)議的功能。其二，電腦的收音只是固定在特定的方向，會(huì)議期間不同的人在不同的方向講話，它的拾音能力絕對(duì)不能滿足需求。其三，電腦和手機(jī)沒(méi)有使用專門的語(yǔ)音芯片做語(yǔ)音處理，會(huì)議期間會(huì)出現(xiàn)雜音，嘯叫，拾音不良 … …等等的情況，嚴(yán)重影響會(huì)議的質(zhì)量和效果。 因此，選用一個(gè)帶有專門語(yǔ)音處理功能的外置拾音speaker，對(duì)會(huì)議的質(zhì)量會(huì)大大提升。本文會(huì)對(duì)這產(chǎn)品的要求做詳細(xì)的介紹。
標(biāo)簽： 麥克風(fēng)陣列 遠(yuǎn)場(chǎng)拾音
上傳時(shí)間： 2022-04-11
上傳用戶：
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