len tak pre radost len tak pre radost len tak pre radost len tak pre radost len tak pre radost
上傳時間: 2017-07-15
上傳用戶:蠢蠢66
In higher power applications to utilize the full line power and reduce line currentharmonics
標簽: Pre-Regulator Interleaved Design Review
上傳時間: 2013-06-04
上傳用戶:lepoke
在無線通信系統全面進入3G并開始邁向 4G的過程中,使用數字預失真技術(Digital Pre-distortion,以下簡稱DPD)對發射機的功放進行線性化是一門關鍵技術。功率放大器是通信系統中影響系統性能和覆蓋范圍的關鍵部件,非線性是功放的固有特性。非線性會引起頻譜增長(spectral re-growth),從而造成鄰道干擾,使帶外雜散達不到協議標準規定的要求。非線性也會造成帶內失真,帶來系統誤碼率增大的問題。
上傳時間: 2013-10-19
上傳用戶:yy_cn
收文單位:左列各單位 發文字號: MT-8-2-0037
上傳時間: 2013-12-17
上傳用戶:123312
兩節鋰電充電IC-ASC8512 ASC8512 為開關型兩節鋰聚合物電池充電管理芯片,非常適合于便攜式設備的充電管理應用。ASC8512 集內置功率MOSFET、高精度電壓和電流調節器、預充、充電狀態指示和充電截止等功能于一體,采用TSSOP-14、SSOP-14兩種封裝形式。ASC8512對電池充電分為三個階段:預充(Pre-charge)、恒流(CC/Constant Current)、恒壓(CV/Constant Voltage)過程,恒流充電電流通過外部電阻決定,最大充電電流為2A.ASC8512 集成電流限制、短路保護,確保充電芯片安全工作。ASC8512 集成NTC 熱敏電阻接口,可以采集、處理電池的溫度信息,保證充電電池的安全工作溫度。 兩節鋰電池充電IC ASC8512特點: 1.充2節鋰離子和鋰聚合物電池 2.開關頻率達400K 3.充電電流最大可做2A 4.輸入電壓9V到18V 5.電池狀態檢測 6.恒壓充電電壓值可通過外接電阻微調 7.千分之五的充電電壓控制精度 5.防反向保護電路可防止電池電流倒灌 6.NTC 熱敏接口監測電池溫度 7.LED充電狀態指示 8.工作環境溫度范圍:-20℃~70℃ 9.TSSOP-14 應用領域:應用 ●手持設備,包括醫療手持設備 ●Portable-DVD,PDA,移動蜂窩電話及智能手機 ●上網本、平板電腦、MID ●自充電電池組
上傳時間: 2013-11-06
上傳用戶:chfanjiang
Demonstration circuit 1562A is an engineering toolto design and evaluate the LTC699X-X family ofTimerBlox circuits. The center section of the boardcontains a pre-configured TimerBlox function.DC1562A comes in twelve timing function variationsas outlined in Table 1.Surrounding the center board is a ”playground”prototyping area. The prototyping area has padsfor Dip-8, S8, MS8, or S6 packages with breadboarding connections to each pin and two convenientpower buses and ground bus surrounding theentire area. This area is for conditioning signals tocontrol the timer function and for adding loads controlled in time.
上傳時間: 2013-10-18
上傳用戶:如果你也聽說
BIT_SELFREFRESH EQU (1<<22) ;定義SDRAM自刷新標志位 16 17 ;Pre-defined constants 預定義6種工作模式 18 USERMODE EQU 0x10 ;用戶模式 19 FIQMODE EQU 0x11 ;快速中斷模式 20 IRQMODE EQU 0x12 ;中斷模式 21 SVCMODE EQU 0x13 ;監管模式 22 ABORTMODE EQU 0x17 ;異常中斷模式 23 UNDEFMODE EQU 0x1b ;未定義模式 24 25 MODEMASK EQU 0x1f ;模式掩碼 26 NOINT EQU 0xc0 ;取消中斷 27 28 ;The location of stacks;設置6種工作模式的堆棧的起始地址 29 ;在option.inc中定義了_STACK_BASEADDRESS EQU 0x33ff8000 30 UserStack EQU (_STACK_BASEADDRESS-0x3800) ;0x33ff4800 ~ 31 SVCStack EQU (_STACK_BASEADDRESS-0x2800) ;0x33ff5800 ~ 32 UndefStack EQU (_STACK_BASEADDRESS-0x2400) ;0x33ff5c00 ~ 33 AbortStack EQU (_STACK_BASEADDRESS-0x2000) ;0x33ff6000 ~ 34 IRQStack EQU (_STACK_BASEADDRESS-0x1000) ;0x33ff7000 ~ 35 FIQStack EQU (_STACK_BASEADDRESS-0x0) ;0x33ff8000 ~
上傳時間: 2013-10-07
上傳用戶:m62383408
FeaturesThe following standard features are provided.• Choice of RTOS scheduling policy1. Pre-emptive:Always runs the highest available task. Tasks of identical priorityshare CPU time (fully pre-emptive with round robin time slicing).2. Cooperative:Context switches only occur if a task blocks, or explicitly callstaskYIELD().• Co-routines (light weight tasks that utilise very little RAM).• Message queues• Semaphores [via macros]• Trace visualisation ability (requires more RAM)• Majority of source code common to all supported development tools• Wide range of ports and examples
上傳時間: 2013-10-13
上傳用戶:13162218709
The LogiCORE™ GTP Wizard automates the task of creating HDL wrappers to configure the high-speed serial GTP transceivers in Virtex™-5 LXT and SXT devices. The menu-driven interface allows one or more GTP transceivers to be configured using pre-definedtemplates for popular industry standards, or from scratch, to support a wide variety of custom protocols.The Wizard produces a wrapper, an example design, and a testbench for rapid integration and verification of the serial interface with your custom function Features• Creates customized HDL wrappers to configureVirtex-5 RocketIO™ GTP transceivers• Users can configure Virtex-5 GTP transceivers toconform to industry standard protocols usingpredefined templates, or tailor the templates forcustom protocols• Included protocol templates provide support for thefollowing specifications: Aurora, CPRI, FibreChannel 1x, Gigabit Ethernet, HD-SDI, OBSAI,OC3, OC12, OC48, PCI Express® (PCIe®), SATA,SATA II, and XAUI• Automatically configures analog settings• Each custom wrapper includes example design, testbench; and both implementation and simulation scripts
標簽: Transceiver Virtex Wizar GTP
上傳時間: 2013-10-23
上傳用戶:leyesome
文中在pre-FFT定時同步算法的基礎上提出一個新的定時同步算法及其改進算法,該算法利用規則集對相關函數和導函數優化的方法得以進一步減小估計方差,本文在給出其推導過程的基礎上給出了仿真結果,并與相關算法進行比較,結果表明新算法的定時估計精度較高且具有一定的魯棒性。
上傳時間: 2013-10-29
上傳用戶:hebmuljb