Single-Ended and Differential S-Parameters Differential circuits have been important incommunication systems for many years. In the past,differential communication circuits operated at lowfrequencies, where they could be designed andanalyzed using lumped-element models andtechniques. With the frequency of operationincreasing beyond 1GHz, and above 1Gbps fordigital communications, this lumped-elementapproach is no longer valid, because the physicalsize of the circuit approaches the size of awavelength.Distributed models and analysis techniques are nowused instead of lumped-element techniques.Scattering parameters, or S-parameters, have beendeveloped for this purpose [1]. These S-parametersare defined for single-ended networks. S-parameterscan be used to describe differential networks, but astrict definition was not developed until Bockelmanand others addressed this issue [2]. Bockelman’swork also included a study on how to adapt single-ended S-parameters for use with differential circuits[2]. This adaptation, called “mixed-mode S-parameters,” addresses differential and common-mode operation, as well as the CONVERSION betweenthe two modes of operation.This application note will explain the use of single-ended and mixed-mode S-parameters, and the basicconcepts of microwave measurement calibration.
上傳時(shí)間： 2014-03-25
上傳用戶：yyyyyyyyyy
為了在CDMA系統(tǒng)中更好地應(yīng)用QDPSK數(shù)字調(diào)制方式，在分析四相相對(duì)移相（QDPSK)信號(hào)調(diào)制解調(diào)原理的基礎(chǔ)上，設(shè)計(jì)了一種QDPSK調(diào)制解調(diào)電路，它包括串并轉(zhuǎn)換、差分編碼、四相載波產(chǎn)生和選相、相干解調(diào)、差分譯碼和并串轉(zhuǎn)換電路。在MAX+PLUSⅡ軟件平臺(tái)上，進(jìn)行了編譯和波形仿真。綜合后下載到復(fù)雜可編程邏輯器件EPM7128SLC84-15中，測(cè)試結(jié)果表明，調(diào)制電路能正確選相，解調(diào)電路輸出數(shù)據(jù)與QDPSK調(diào)制輸入數(shù)據(jù)完全一致，達(dá)到了預(yù)期的設(shè)計(jì)要求。 Abstract: In order to realize the better application of digital modulation mode QDPSK in the CDMA system， a sort of QDPSK modulation-demodulation circuit was designed based on the analysis of QDPSK signal modulation-demodulation principles. It included serial/parallel CONVERSION circuit, differential encoding circuit, four-phase carrier wave produced and phase chosen circuit, coherent demodulation circuit, difference decoding circuit and parallel/serial CONVERSION circuit. And it was compiled and simulated on the MAX+PLUSⅡ software platform,and downloaded into the CPLD of EPM7128SLC84-15.The test result shows that the modulation circuit can exactly choose the phase，and the output data of the demodulator circuit is the same as the input data of the QDPSK modulate. The circuit achieves the prospective requirement of the design.
標(biāo)簽： QDPSK CPLD 調(diào)制解調(diào) 電路設(shè)計(jì)
上傳時(shí)間： 2013-10-28
上傳用戶：jyycc
系統(tǒng)下,地球坐標(biāo)轉(zhuǎn)換的源代碼,在WGS-84坐標(biāo)和北京54坐標(biāo)之間的一套轉(zhuǎn)換參數(shù),可以全國(guó)通用的，在每個(gè)地方會(huì)不一樣，因?yàn)樗鼈兪莾蓚€(gè)不同的橢球基準(zhǔn)。 // WGS2GK.CPP : C++ version of Ottmar Labonde s WGSDHDN3.PAS with CPU time measurement // compile with MS Visual C++ version 6.0 or do the necessary modifications for your compiler // // CONVERSION of
上傳時(shí)間： 2014-01-09
上傳用戶：hxy200501
內(nèi)容如下： 1.The history of the computerized database 2.SQL Data Statements--those used to create, manipulate, and retrieve data stored in your database example statements include select, update, insert, and delete 3.SQL Schema Statements--those used to create database objects, such as tables, indexes, and constraints 4.How data sets can interact with queries 5.The importance of subqueries 6.Data CONVERSION and manipulation via SQL s built-in functions 7.How conditional logic can be used in Data Statements
標(biāo)簽： computerized Statements database history
上傳時(shí)間： 2015-04-25
上傳用戶：ardager
來自澳大利亞Qeensland大學(xué)的計(jì)算機(jī)視覺Matlab工具箱。 This Toolbox provides a number of functions that are useful in computer vision, machine vision and related areas. It is a somewhat eclectic collection reflecting the author s personal interest in areas of photometry, photogrammetry, colorimetry. It covers functions such as image file reading and writing, filtering, segmentation, feature extraction, camera calibration, camera exterior orientation, display, color space CONVERSION and blackbody radiators. The Toolbox, combined with MATLAB and a modern workstation computer, is a useful and convenient environment for investigation of machine vision algorithms. It is possible to use MEX files to interface with image acquisition hardware ranging from simple framegrabbers to Datacube servers.
標(biāo)簽： Qeensland functions provides Toolbox
上傳時(shí)間： 2015-09-30
上傳用戶：qb1993225
- Convert file (plain text) or clipboard content among the following encodings: big5, gbk, hz, shift-jis, jis, euc-jp, unicode big-endian, unicode little-endian, and utf-8. - Batch files CONVERSION - Preview file content and converted result before actual CONVERSION.
標(biāo)簽： clipboard encodings following Convert
上傳時(shí)間： 2015-10-13
上傳用戶：manlian
This document contains a general overview in the first few sections as well as a more detailed reference in later sections for SVMpython. If you re already familiar with SVMpython, it s possible to get a pretty good idea of how to use the package merely by browsing through svmstruct.py and multiclass.py. This document provides a more in depth view of how to use the package. Note that this is not a CONVERSION of SVMstruct to Python. It is merely an embedding of Python in existing C code. All code other than the user implemented API functions is still in C, including optimization.
標(biāo)簽： document contains detailed overview
上傳時(shí)間： 2013-12-14
上傳用戶：希醬大魔王
This program demonstrates operation of ADC0 in polled mode. The ADC0 is // configured to use writes to AD0BUSY as its start of CONVERSION source and // to measure the output of the on-chip temperature sensor. The temperature // sensor output is converted to degrees Celsius and is transmitted out UART0
標(biāo)簽： ADC0 demonstrates configured operation
上傳時(shí)間： 2014-01-23
上傳用戶：wangyi39
This program demonstrates operation of ADC0 in polled mode. The ADC0 is // configured to use writes to AD0BUSY as its start of CONVERSION source and // to measure the output of the on-chip temperature sensor. The temperature // sensor output is converted to degrees Celsius and is transmitted out UART0
標(biāo)簽： ADC0 demonstrates configured operation
上傳時(shí)間： 2014-08-18
上傳用戶：米卡
This module is built to provide more practical/effective functions than php iconv for character encoding CONVERSION. Chinese package has been included: gb<->big5, (gb,big5)<->utf8<->unicode, (gb, big5)->pinyin. The Chinese package was built based on the Chinese encoding lib
標(biāo)簽： effective character functions practical
上傳時(shí)間： 2016-02-20
上傳用戶：songyue1991
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