his research aims at creating broadBand tunable, fully integrated filters for the application of cognitive radio and signal classification receivers. The approach under study is the N-path filter technique which is capable of translating a baseBand impedance to a reference frequency creating a tunable filter. The traditional N-path filter suffers from fundamental architectural limitations, namely : a trade-off between insertion loss and out-of-Band rejection, reference clock feed- through, and jammer power handling limitations. In the first approach, the fundamental trade- off of the traditional N-path filter between insertion loss and out-of-Band rejection is improved by a transmission line (T-line) N-path filter technique.
上傳時間： 2020-05-31
上傳用戶：shancjb
This book provides the essential design techniques for radio systems that operate at frequencies of 3 MHz to 100 GHz and which will be employed in the telecommunication service. We may also call these wireless systems, wireless being synonymous with radio, Telecommunications is a vibrant indus- try, particularly on the ‘‘radio side of the house.’’ The major supporter of this upsurge in radio has been the IEEE and its 802 committees. We now devote ? . an entire chapter to wireless LANs WLANs detailed in IEEE 802.11. We also now have subsections on IEEE 802.15, 802.16, 802.20 and the wireless ? . ? metropolitan area network WMAN . WiFi, WiMax,, and UWB ultra wide- . Band are described where these comparatively new radio specialties are demonstrating spectacular growth.
標簽： Telecommunication Design System Radio for
上傳時間： 2020-06-01
上傳用戶：shancjb
Software Radio (SR) is one of the most important emerging technologies for the future of wireless communication services. By moving radio functionality into software, it promises to give flexible radio systems that are multi-service, multi- standard, multi-Band, reconfigurable and reprogrammable by software. Today’s radios are matched to a particular class of signals that are well defined bytheircarrierfrequencies,modulationformatsandBandwidths.Aradiotransmitter today can only up convert signals with well-defined Bandwidths over defined center frequencies, while, on the other side of the communication chain, a radio receiver can only down convert well-defined signal Bandwidths, transmitted over specified carrier frequencies.
上傳時間： 2020-06-01
上傳用戶：shancjb
Recent advances in wireless communication technologies have had a transforma- tive impact on society and have directly contributed to several economic and social aspects of daily life. Increasingly, the untethered exchange of information between devices is becoming a prime requirement for further progress, which is placing an ever greater demand on wireless Bandwidth. The ultra wideBand (UWB) system marks a major milestone in this progress. Since 2002, when the FCC allowed the unlicensed use of low-power, UWB radio signals in the 3.1–10.6GHz frequency Band, there has been significant synergistic advance in this technology at the cir- cuits, architectural and communication systems levels. This technology allows for devices to communicate wirelessly, while coexisting with other users by ensuring that its power density is sufficiently low so that it is perceived as noise to other users.
上傳時間： 2020-06-01
上傳用戶：shancjb
高通(Qualcomm)藍牙芯片QCC5151_硬件設計詳細指導書（官方內部培訓手冊）共52頁其內容是針對硬件設計、部分重要元器件選擇(ESD，Filter）及走線注意事項的詳細說明。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)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
上傳時間： 2022-01-24
上傳用戶：XuVshu
高通(Qualcomm)藍牙芯片QCC5144_硬件設計詳細指導書（官方內部培訓手冊）其內容是針對硬件設計、部分重要元器件選擇(ESD，Filter）及走線注意事項的詳細說明。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)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
上傳時間： 2022-04-07
上傳用戶：默默
窄帶物聯網(NB-IoT)窄帶物聯網（Narrow Band Internet of Things, NB-IoT）成為萬物互聯網絡的一個重要分支。NB-IoT構建于蜂窩網絡，只消耗大約180kHz的帶寬，可直接部署于GSM網絡、UMTS網絡或LTE網絡，以降低部署成本、實現平滑升級。 NB-IoT是IoT領域一個新興的技術，支持低功耗設備在廣域網的蜂窩數據連接，也被叫作低功耗廣域網(LPWAN)。NB-IoT支持待機時間長、對網絡連接要求較高設備的高效連接。據說NB-IoT設備電池壽命可以提高至少10年，同時還能提供非常全面的室內蜂窩數據連接覆蓋。2017年7月13日，ofo小黃車與中國電信、華為共同宣布，三家聯合研發的NB-IoT（Narrow Band Internet of Things，窄帶物聯網）“物聯網智能鎖”全面啟動商用。 [9] 據了解，在此次三方合作中，ofo負責智能鎖設備開發，中國電信負責提供NB-IoT物聯網的商用網絡、華為負責芯片方面的服務。此前ofo已經開始使用這款物聯網智能鎖，而此次將啟動全面的商用。
標簽： NB-IOT
上傳時間： 2022-04-19
上傳用戶：
LwM2M協議是OMA組織制定的輕量化的M2M協議，主要面向基于蜂窩的窄帶物聯網（Narrow Band Internet of Things, NB-IoT）場景下物聯網應用，聚焦于低功耗廣覆蓋（LPWA）物聯網（IoT）市場，是一種可在全球范圍內廣泛應用的新興技術。具有覆蓋廣、連接多、速率低、成本低、功耗低、架構優等特點
標簽： lwm2m協議
上傳時間： 2022-06-05
上傳用戶：kent
【摘要】介紹一種濾波器輔助設計軟件Filter Solutions，利用其設計一款常用的帶通濾波器，并將仿真曲線與實測結果進行比較。【關鍵詞】Filter Solutions；濾波器；輔助設計Use Filter Solutions aid filter design Abstract:Introduce a software-Filter Solutions，which aid to design filter.Use it to digign a common Band pass filter，then compare the result ofreslstemeasweothe simuetur，I1.Com Key words:Filter Solutions；filter；aid design1引言廣義上的濾波器深入到我們生活中的每一個角落，人眼對圖像的反應符合低通濾波器的特征，人耳對聲音的反應則符合帶通濾波器的特征。隨著近年來電子工業的飛速發展，濾波器已成為電子技術應用中不可缺少的基礎器件之一，尤其廣泛地應用于通信領域。能快捷而準確地設計出預期特性的濾波器已成為所有電子工程師越來越強烈的需要。
上傳時間： 2022-06-25
上傳用戶：
NB-IOT學習總結基于蜂窩的窄帶物聯網（Narrow Band Internet of Things，NB-loT）成為萬物互聯網絡的一個重要分支。NB-loT構建于蜂窩網絡，只消耗大約180KHz的帶寬，可直接部署于GSM網絡、UMTS網絡或LTE網絡，以降低部署成本、實現平滑升級。NB-loT是loT領域一個新興的技術，支持低功耗設備在廣域網的蜂窩數據連接，也被叫作低功耗廣域網（LPWA）（Low Power Wide Area，低功耗廣域技術）。NB-loT支持待機時間長、對網絡連接要求較高設備的高效連接。據說NB-loT設備電池壽命可以提高至至少10年，同時還能提供非常全面的室內蜂窩數據連接覆蓋。一、NB-IOT架構NB-loT端到端系統框架的建議
標簽： NB-IoT
上傳時間： 2022-07-02
上傳用戶：
