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·VC寫的對DTMF信號的識別程序文件列表: About.c about.h dtmffft.c DTMFFFT.exe DTMFFFT.rc fft.c fft.h Parameter.c Parameter.h readme.txt Regis
標(biāo)簽：
DTMF
信號
識別
程序
上傳時間：
2013-04-24
上傳用戶：caixiaoxu26
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Abstract: Many digital devices incorporate analog circuits. For instance, microprocessors, applicationspecificintegrated circuits (ASICs), and field-programmable gate arrays (FPGAs) may have internalvoltage references, analog-to-digital converters (ADCs) or digital-to-analog converters (DACs). However,there are challenges when you integrate more analog onto a digital design. As with all things in life, inelectronics we must always trade one Parameter for another, with the application dictating the propertrade-off of analog function. In this application note, we examine how the demand for economy of spaceand cost pushes analog circuits onto digital substrates, and what design challenges emerge.
標(biāo)簽：
模擬IC
性能
模擬
數(shù)字化設(shè)計
上傳時間：
2013-11-17
上傳用戶：菁菁聆聽
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Most circuit designers are familiar with diode dynamiccharacteristics such as charge storage, voltage dependentcapacitance and reverse recovery time. Less commonlyacknowledged and manufacturer specifi ed is diode forwardturn-on time. This Parameter describes the timerequired for a diode to turn on and clamp at its forwardvoltage drop. Historically, this extremely short time, unitsof nanoseconds, has been so small that user and vendoralike have essentially ignored it. It is rarely discussed andalmost never specifi ed. Recently, switching regulator clockrate and transition time have become faster, making diodeturn-on time a critical issue. Increased clock rates aremandated to achieve smaller magnetics size; decreasedtransition times somewhat aid overall effi ciency but areprincipally needed to minimize IC heat rise. At clock speedsbeyond about 1MHz, transition time losses are the primarysource of die heating.
標(biāo)簽：
二極管
導(dǎo)通
開關(guān)穩(wěn)壓器
上傳時間：
2013-10-10
上傳用戶：誰偷了我的麥兜
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Radio Frequency Integrated Circuit Design
I enjoyed reading this book for a number of reasons. One reason is that itaddresses high-speed analog design in the context of microwave issues. This isan advanced-level book, which should follow courses in basic circuits andtransmission lines. Most analog integrated circuit designers in the past workedon applications at low enough frequency that microwave issues did not arise.As a consequence, they were adept at lumped Parameter circuits and often notcomfortable with circuits where waves travel in space. However, in order todesign radio frequency (RF) communications integrated circuits (IC) in thegigahertz range, one must deal with transmission lines at chip interfaces andwhere interconnections on chip are far apart. Also, impedance matching isaddressed, which is a topic that arises most often in microwave circuits. In mycareer, there has been a gap in comprehension between analog low-frequencydesigners and microwave designers. Often, similar issues were dealt with in twodifferent languages. Although this book is more firmly based in lumped-elementanalog circuit design, it is nice to see that microwave knowledge is brought inwhere necessary.Too many analog circuit books in the past have concentrated first on thecircuit side rather than on basic theory behind their application in communications.The circuits usually used have evolved through experience, without asatisfying intellectual theme in describing them. Why a given circuit works bestcan be subtle, and often these circuits are chosen only through experience. Forthis reason, I am happy that the book begins first with topics that require anintellectual approach—noise, linearity and filtering, and technology issues. Iam particularly happy with how linearity is introduced (power series). In therest of the book it is then shown, with specific circuits and numerical examples,how linearity and noise issues arise.
標(biāo)簽：
Rogers
Radio
John
Freq
上傳時間：
2014-12-23
上傳用戶：han_zh
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氣壓是氣象監(jiān)測中的一個重要參數(shù)，提出了一種氣壓數(shù)據(jù)采集模塊設(shè)計方案，該模塊采用數(shù)字氣壓傳感器MS5534B、MSP430單片機(jī)MSP430F2272和帶實時時鐘（RTC）64 KB鐵電存儲器。通過低功耗軟件設(shè)計方法以微安級整體平均功耗實現(xiàn)了氣壓數(shù)據(jù)的采集和存儲，適合電池供電的連續(xù)高精度氣壓采集應(yīng)用。給出了模塊的軟硬件設(shè)計以及MS5534B的性能指標(biāo)和使用經(jīng)驗。
Abstract:
Air pressure is an important Parameter in weather monitor.This paper futs forward a new design scheme of low power-air pressure data acquisition module.The module uses a digital output barometer sensor MS5534B,MSP430 microcontroller MSP430F2272 and integrated RTC 64KB FRAM,precision air pressure measurement and storage chip.Another point of this module is low power consumption, so it is well suited for battery powered air pressure data acquisition applications. At the same time,the software and hardware deign of module is presented,And the speciaties and use notices of MS5534B are given.
標(biāo)簽：
5534B
5534
MS
微功耗
上傳時間：
2014-12-27
上傳用戶：drink！
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有兩種方式可以讓設(shè)備和應(yīng)用程序之間聯(lián)系：1. 通過為設(shè)備創(chuàng)建的一個符號鏈；2. 通過輸出到一個接口WDM驅(qū)動程序建議使用輸出到一個接口而不推薦使用創(chuàng)建符號鏈的方法。這個接口保證PDO的安全，也保證安全地創(chuàng)建一個惟一的、獨立于語言的訪問設(shè)備的方法。一個應(yīng)用程序使用Win32APIs來調(diào)用設(shè)備。在某個Win32 APIs和設(shè)備對象的分發(fā)函數(shù)之間存在一個映射關(guān)系。獲得對設(shè)備對象訪問的第一步就是打開一個設(shè)備對象的句柄。
用符號鏈打開一個設(shè)備的句柄為了打開一個設(shè)備，應(yīng)用程序需要使用CreateFile。如果該設(shè)備有一個符號鏈出口，應(yīng)用程序可以用下面這個例子的形式打開句柄：hDevice = CreateFile("\\\\.\\OMNIPORT3", GENERIC_READ | GENERIC_WRITE,FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL ,NULL);文件路徑名的前綴“\\.\”告訴系統(tǒng)本調(diào)用希望打開一個設(shè)備。這個設(shè)備必須有一個符號鏈，以便應(yīng)用程序能夠打開它。有關(guān)細(xì)節(jié)查看有關(guān)Kdevice和CreateLink的內(nèi)容。在上述調(diào)用中第一個參數(shù)中前綴后的部分就是這個符號鏈的名字。注意：CreatFile中的第一個參數(shù)不是Windows 98/2000中驅(qū)動程序(.sys文件)的路徑。是到設(shè)備對象的符號鏈。如果使用DriverWizard產(chǎn)生驅(qū)動程序，它通常使用類KunitizedName來構(gòu)成設(shè)備的符號鏈。這意味著符號鏈名有一個附加的數(shù)字，通常是0。例如：如果鏈接名稱的主干是L“TestDevice”那么在CreateFile中的串就該是“\\\\.\\TestDevice0”。如果應(yīng)用程序需要被覆蓋的I/O，第六個參數(shù)(Flags)必須或上FILE_FLAG_OVERLAPPED。
使用一個輸出接口打開句柄用這種方式打開一個句柄會稍微麻煩一些。DriverWorks庫提供兩個助手類來使獲得對該接口的訪問容易一些，這兩個類是CDeviceInterface, 和 CdeviceInterfaceClass。CdeviceInterfaceClass類封裝了一個設(shè)備信息集，該信息集包含了特殊類中的所有設(shè)備接口信息。應(yīng)用程序能有用CdeviceInterfaceClass類的一個實例來獲得一個或更多的CdeviceInterface類的實例。CdeviceInterface類是一個單一設(shè)備接口的抽象。它的成員函數(shù)DevicePath()返回一個路徑名的指針，該指針可以在CreateFile中使用來打開設(shè)備。下面用一個小例子來顯示這些類最基本的使用方法：extern GUID TestGuid;HANDLE OpenByInterface( GUID* pClassGuid, DWORD instance, PDWORD pError){ CDeviceInterfaceClass DevClass(pClassGuid, pError); if (*pError != ERROR_SUCCESS) return INVALID_HANDLE_VALUE; CDeviceInterface DevInterface(&DevClass, instance, pError); if (*pError != ERROR_SUCCESS) return INVALID_HANDLE_VALUE; cout << "The device path is " << DevInterface.DevicePath() << endl;
HANDLE hDev; hDev = CreateFile( DevInterface.DevicePath(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); if (hDev == INVALID_HANDLE_VALUE) *pError = GetLastError(); return hDev;}
在設(shè)備中執(zhí)行I/O操作一旦應(yīng)用程序獲得一個有效的設(shè)備句柄，它就能使用Win32 APIs來產(chǎn)生到設(shè)備對象的IRPs。下面的表顯示了這種對應(yīng)關(guān)系。Win32 API DRIVER_FUNCTION_xxxIRP_MJ_xxx KDevice subclass member function CreateFile CREATE Create ReadFile READ Read WriteFile WRITE Write DeviceIoControl DEVICE_CONTROL DeviceControl CloseHandle CLOSECLEANUP CloseCleanUp 需要解釋一下設(shè)備類成員的Close和CleanUp：CreateFile使內(nèi)核為設(shè)備創(chuàng)建一個新的文件對象。這使得多個句柄可以映射同一個文件對象。當(dāng)這個文件對象的最后一個用戶級句柄被撤銷后，I/O管理器調(diào)用CleanUp。當(dāng)沒有任何用戶級和核心級的對文件對象的訪問的時候，I/O管理器調(diào)用Close。如果被打開的設(shè)備不支持指定的功能，則調(diào)用相應(yīng)的Win32將引起錯誤（無效功能）。以前為Windows95編寫的VxD的應(yīng)用程序代碼中可能會在打開設(shè)備的時候使用FILE_FLAG_DELETE_ON_CLOSE屬性。在Windows NT/2000中，建議不要使用這個屬性，因為它將導(dǎo)致沒有特權(quán)的用戶企圖打開這個設(shè)備，這是不可能成功的。I/O管理器將ReadFile和WriteFile的buff參數(shù)轉(zhuǎn)換成IRP域的方法依賴于設(shè)備對象的屬性。當(dāng)設(shè)備設(shè)置DO_DIRECT_IO標(biāo)志，I/O管理器將buff鎖住在存儲器中，并且創(chuàng)建了一個存儲在IRP中的MDL域。一個設(shè)備可以通過調(diào)用Kirp::Mdl來存取MDL。當(dāng)設(shè)備設(shè)置DO_BUFFERED_IO標(biāo)志，設(shè)備對象分別通過KIrp::BufferedReadDest或 KIrp::BufferedWriteSource為讀或?qū)懖僮鳙@得buff地址。當(dāng)設(shè)備不設(shè)置DO_BUFFERED_IO標(biāo)志也不設(shè)置DO_DIRECT_IO，內(nèi)核設(shè)置IRP 的UserBuffer域來對應(yīng)ReadFile或WriteFile中的buff參數(shù)。然而，存儲區(qū)并沒有被鎖住而且地址只對調(diào)用進(jìn)程有效。驅(qū)動程序可以使用KIrp::UserBuffer來存取IRP域。對于DeviceIoControl調(diào)用，buffer參數(shù)的轉(zhuǎn)換依賴于特殊的I/O控制代碼，它不在設(shè)備對象的特性中。宏CTL_CODE（在winioctl.h中定義）用來構(gòu)造控制代碼。這個宏的其中一個參數(shù)指明緩沖方法是METHOD_BUFFERED, METHOD_IN_DIRECT, METHOD_OUT_DIRECT, 或METHOD_NEITHER。下面的表顯示了這些方法和與之對應(yīng)的能獲得輸入緩沖與輸出緩沖的KIrp中的成員函數(shù)：Method Input Buffer Parameter Output Buffer Parameter METHOD_BUFFERED KIrp::IoctlBuffer KIrp::IoctlBuffer
METHOD_IN_DIRECT KIrp::IoctlBuffer KIrp::Mdl
METHOD_OUT_DIRECT KIrp::IoctlBuffer KIrp::Mdl
METHOD_NEITHER KIrp::IoctlType3InputBuffer KIrp::UserBuffer
如果控制代碼指明METHOD_BUFFERED，系統(tǒng)分配一個單一的緩沖來作為輸入與輸出。驅(qū)動程序必須在向輸出緩沖放數(shù)據(jù)之前拷貝輸入數(shù)據(jù)。驅(qū)動程序通過調(diào)用KIrp::IoctlBuffer獲得緩沖地址。在完成時，I/O管理器從系統(tǒng)緩沖拷貝數(shù)據(jù)到提供給Ring 3級調(diào)用者使用的緩沖中。驅(qū)動程序必須在結(jié)束前存儲拷貝到IRP的Information成員中的數(shù)據(jù)個數(shù)。如果控制代碼不指明METHOD_IN_DIRECT或METHOD_OUT_DIRECT，則DeviceIoControl的參數(shù)呈現(xiàn)不同的含義。參數(shù)InputBuffer被拷貝到一個系統(tǒng)緩沖，這個緩沖驅(qū)動程序可以通過調(diào)用KIrp::IoctlBuffer。參數(shù)OutputBuffer被映射到KMemory對象，驅(qū)動程序?qū)@個對象的訪問通過調(diào)用KIrp::Mdl來實現(xiàn)。對于METHOD_OUT_DIRECT，調(diào)用者必須有對緩沖的寫訪問權(quán)限。注意，對METHOD_NEITHER，內(nèi)核只提供虛擬地址；它不會做映射來配置緩沖。虛擬地址只對調(diào)用進(jìn)程有效。這里是一個用METHOD_BUFFERED的例子：首先，使用宏CTL_CODE來定義一個IOCTL代碼：#define IOCTL_MYDEV_GET_FIRMWARE_REV \CTL_CODE (FILE_DEVICE_UNKNOWN,0,METHOD_BUFFERED,FILE_ANY_ACCESS)現(xiàn)在使用一個DeviceIoControl調(diào)用：BOOLEAN b;CHAR FirmwareRev[60];ULONG FirmwareRevSize;b = DeviceIoControl(hDevice, IOCTL_MYDEV_GET_VERSION_STRING, NULL, // no input 注意，這里放的是包含有執(zhí)行操作命令的字符串指針 0, FirmwareRev, //這里是output串指針，存放從驅(qū)動程序中返回的字符串。sizeof(FirmwareRev),& FirmwareRevSize, NULL // not overlapped I/O );如果輸出緩沖足夠大，設(shè)備拷貝串到里面并將拷貝的資結(jié)束設(shè)置到FirmwareRevSize中。在驅(qū)動程序中，代碼看起來如下所示：const char* FIRMWARE_REV = "FW 16.33 v5";NTSTATUS MyDevice::DeviceControl( KIrp I ){ ULONG fwLength=0; switch ( I.IoctlCode() ) { case IOCTL_MYDEV_GET_FIRMWARE_REV: fwLength = strlen(FIRMWARE_REV)+1; if (I.IoctlOutputBufferSize() >= fwLength) { strcpy((PCHAR)I.IoctlBuffer(),FIRMWARE_REV); I.Information() = fwLength; return I.Complete(STATUS_SUCCESS); } else { } case . . . } }
標(biāo)簽：
驅(qū)動程序
應(yīng)用程序
接口
上傳時間：
2013-10-17
上傳用戶：gai928943
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Emu51Form是一個軟仿真計時器，copy到keil\c51\bin下 project->option for target "target 1"->debug->dialog.dll->Parameter改為-p51R -dEmu51Form即可在keil 7.0運(yùn)行成功，因為使用的一些函數(shù)是在最新的AGSI文檔中獲得，所以大家試試在6.23下能不能用。
標(biāo)簽：
Form
Emu
51
軟
上傳時間：
2013-10-28
上傳用戶：15736969615
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為提升虛擬儀器傳輸速率與實時性能，擴(kuò)展監(jiān)測范圍，在VC的軟件平臺上設(shè)計了一種全功能虛擬示波器。與傳統(tǒng)虛擬示波器相比，該系統(tǒng)采用嵌入式系統(tǒng)完成信號采集，采用工業(yè)以太網(wǎng)為傳輸介質(zhì)，通過線性插值算法和多線程編程思想，實現(xiàn)波形顯示、參數(shù)計算、頻譜分析以及波形存儲及回放功能。實驗結(jié)果表明，該虛擬示波器可以實現(xiàn)20 kHz采樣頻率下的波形精確顯示，達(dá)到預(yù)期的各項指標(biāo)。
Abstract:
o enhance the transfer rate and real-time of virtual instrument performance， expand scope of monitoring， this paper uses the VCs software platform to design a fully functional virtual oscilloscope. Compared with traditional virtual oscilloscope， this system adopts the embedded system to complete the data acquisition， industrial Ethernet as the transmission medium used by the linear interpolation algorithm and multi-threaded programming ideas， namely to achieve waveform display， Parameter calculation， spectrum analysis and waveform storage and playback. Experimental results show that the virtual oscilloscope can accurately display the waveform with 20kHz sampling frequency， and achieve the desired targets.
標(biāo)簽：
以太網(wǎng)
虛擬
波器設(shè)計
上傳時間：
2013-11-25
上傳用戶：wbwyl
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Agilent AN 154 S-Parameter Design Application Note S參數(shù)的設(shè)計與應(yīng)用
The need for new high-frequency, solid-state circuitdesign techniques has been recognized both by microwaveengineers and circuit designers. These engineersare being asked to design solid state circuitsthat will operate at higher and higher frequencies.The development of microwave transistors andAgilent Technologies’ network analysis instrumentationsystems that permit complete network characterizationin the microwave frequency rangehave greatly assisted these engineers in their work.The Agilent Microwave Division’s lab staff hasdeveloped a high frequency circuit design seminarto assist their counterparts in R&D labs throughoutthe world. This seminar has been presentedin a number of locations in the United States andEurope.From the experience gained in presenting this originalseminar, we have developed a four-part videotape, S-Parameter Design Seminar. While the technologyof high frequency circuit design is everchanging, the concepts upon which this technologyhas been built are relatively invariant.The content of the S-Parameter Design Seminar isas follows:
標(biāo)簽：
S參數(shù)
上傳時間：
2013-12-19
上傳用戶：aa54
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Nios II 系列處理器配置選項:This chapter describes the Nios® II Processor Parameter editor in Qsys and SOPC Builder. The Nios II Processor Parameter editor allows you to specify the processor features for a particular Nios II hardware system. This chapter covers the features of the Nios II processor that you can configure with the Nios II Processor Parameter editor; it is not a user guide for creating complete Nios II processor systems.
標(biāo)簽：
Nios
II
列處理器
上傳時間：
2015-01-01
上傳用戶：mahone
