The data plane of the reference design consists of a configurable multi-channel XBERT modulethat generates and checks high-speed serial data transmitted and received by the MGTs. Eachchannel in the XBERT module consists of two MGTs (MGTA and MGTB), which physicallyoccupy one MGT tile in the Virtex-4 FPGA. Each MGT has its own pattern checker, but bothMGTs in a channel share the same pattern generator. Each channel can load a differentpattern. The MGT serial rate depends on the reference clock frequency and the internal PMAdivider settings. The reference design can be scaled anywhere from one channel (two MGTs)to twelve channels (twenty-four MGTs).
上傳時間： 2013-12-25
上傳用戶：jkhjkh1982
The AN10 begins with a survey of methods for measuring op amp settling time. This commentary develops into circuits for measuring settling time to 0.0005%. Construction details and results are presented. Appended sections cover oscilloscope overload limitations and amplifier frequency compensation.
上傳時間： 2013-11-14
上傳用戶：JIMMYCB001
基于通用集成運算放大器，利用MASON公式設計了一個多功能二階通用濾波器，能同時或分別實現(xiàn)低通、高通和帶通濾波，也能設計成一個正交振蕩器。電路的極點頻率和品質因數(shù)能夠獨立、精確地調節(jié)。電路使用4個集成運放、2個電容和11個電阻，所有集成運放的反相端虛地。利用計算機仿真電路的通用濾波功能、極點頻率和品質因數(shù)的獨立控制和正交正弦振蕩，從而證明該濾波器正確有效。 Abstract: A new multifunctional second-order filter based on OPs was presented by MASON formula. Functions， such as high-pass， band-pass， low-pass filtering， can be realized respectively and simultaneously， and can become a quadrature oscillator by modifying resistance ratio. Its pole angular frequency and quality factor can be tuned accurately and independently. The circuit presented contains four OPs， two capacitors， and eleven resistances， and inverting input of all OPs is virtual ground. Its general filtering， the independent control of pole frequency and quality factor and quadrature sinusoidal oscillation were simulated by computer， and the result shows that the presented circuit is valid and effective.
上傳時間： 2013-10-09
上傳用戶：13788529953
在Multisim 10軟件環(huán)境下，設計一種由運算放大器構成的精確可控矩形波信號發(fā)生器，結合系統(tǒng)電路原理圖重點闡述了各參數(shù)指標的實現(xiàn)與測試方法。通過改變RC電路的電容充、放電路徑和時間常數(shù)實現(xiàn)了占空比和頻率的調節(jié)，通過多路開關投入不同數(shù)值的電容實現(xiàn)了頻段的調節(jié)，通過電壓取樣和同相放大電路實現(xiàn)了輸出電壓幅值的調節(jié)并提高了電路的帶負載能力，可作為頻率和幅值可調的方波信號發(fā)生器。Multisim 10仿真分析及應用電路測試結果表明，電路性能指標達到了設計要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of applicable circuit show that the performance indicators of the circuit meets the design requirements.
上傳時間： 2014-01-21
上傳用戶：shen007yue
要生產音頻脈沖，只要算出某一音頻的周期(1/頻率)，可以利用定時器計時的方式得到此頻率的脈沖。而Arduino平臺“封裝”了新的數(shù)字輸出函數(shù)tone()。更簡易的實現(xiàn)喇叭和蜂鳴器唱歌。 tone(pin, frequency)，Arduino會向指定pin發(fā)送制定頻率的方波，執(zhí)行noTone()函數(shù)來停止。 tone(pin, frequency, duration方法多了一個參數(shù)，代表發(fā)送方波持續(xù)的時間，到時自動停止發(fā)送信號，就不需要noTone()函數(shù)。 利用tone()函數(shù)播放音樂，只需要查表了解各個音符對應的頻率，還要求個人稍微能看懂音樂譜子的節(jié)拍。 物料清單 ： Arduino 328控制板 1塊 8Ω 0.5W的喇叭（或者蜂鳴器） 1個（ATmega328的驅動能力足夠，直接拉電流就ok!） 12Ω電阻(限流) 1個 實物圖：
上傳時間： 2013-10-14
上傳用戶：jiangxiansheng
This application note discusses a variety of approaches for interfacing analog signals to 5V powered systems. Synthesizing a "rail-to-rail" op amp and scaling techniques for A/D converters are covered. A voltage-to-frequency converter, applicable where high resolution is required, is also presented.
標簽： 微處理器 系統(tǒng)接口
上傳時間： 2013-10-12
上傳用戶：181992417
XMail is an Internet and intranet mail server featuring an SMTP server, POP3 server, finger server, multiple domains, no need for users to have a real system account, SMTP relay checking, RBL/RSS/ORBS/DUL and custom ( IP based and address based ) spam protection, SMTP authentication ( PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom ), a POP3 account syncronizer with external POP3 accounts, account aliases, domain aliases, custom mail processing, direct mail files delivery, custom mail filters, mailing lists, remote administration, custom mail exchangers, logging, and multi-platform code. XMail sources compile under GNU/Linux, FreeBSD, OpenBSD, NetBSD, OSX, Solaris and NT/2K/XP.
標簽： server featuring Internet intranet
上傳時間： 2015-01-12
上傳用戶：asddsd
Filename: main.c * Description: A simple test program for the CRC implementations. * Notes: To test a different CRC standard, modify crc.h. * * * Copyright (c) 2000 by Michael Barr. This software is placed into * the public domain and may be used for any purpose. However, this * notice must not be changed or removed and no warranty is either * expressed or implied by its publication or distribution.
標簽： test implementations Description Filename
上傳時間： 2015-02-02
上傳用戶：leehom61
IPsec VPN的RFC文檔集合: RFC 2401 《Security Architecture for the Internet Protocol》 RFC 2402 《IP Authentication Header》 RFC 2406 《IP Encapsulating Security Payload (ESP)》 RFC 2407 《The Internet IP Security Domain of Interpretation for ISAKMP》 RFC 2408 《Internet Security Association and Key Management Protocol (ISAKMP)》 RFC 2409 《The Internet Key Exchange (IKE)》 RFC 3947 《Negotiation of NAT-Traversal in the IKE》 RFC 3948 《UDP Encapsulation of IPsec ESP Packets》
標簽： RFC Architecture Internet Protocol
上傳時間： 2015-04-21
上傳用戶：hebmuljb
ZigBee™ 是專為低速率傳感器和控制網絡設計的無線網絡協(xié)議。有許多應用可從ZigBee 協(xié)議受益，其中可能的一些應用有：建筑自動化網絡、住宅安防系統(tǒng)、工業(yè)控制網絡、遠程抄表以及PC 外設。此程序包提供的是Zigbee協(xié)義棧函數(shù)庫源代碼，它實現(xiàn)了一個與物理層 無關的應用程序接口。 因此，無需做重大修改就可以輕松地在射頻（Radio Frequency，RF）收發(fā)器之間移植應用程序。
上傳時間： 2014-01-16
上傳用戶：Pzj
