·SystemVerilog is a rich set of extensions to the IEEE 1364-2001 Verilog Hardware Description Language (Verilog HDL). These extensions address two major aspects of HDL-based design. First, modeling ver
标签： nbsp SystemVerilog Design for
上传时间： 2013-07-14
上传用户：ainimao
·详细说明：基于DM642的JPEG图象编解码的网络传输程序文件列表: jpeg_network ............\bin ............\...\jpeg_network.out ............\driver_test.cmd ............\include .........
上传时间： 2013-06-07
上传用户：7676777
Protel99se鼠标增强软件2.0: 2.0版本改名为“Protel99se鼠标增强软件”，是因为使用普通三键鼠标也可实现 放大和缩小功能。 1.0版本功能：(软件名称：“Protel99se增加鼠标滚轮放大缩小功能”) 向上滚动滚轮 --> Zoom In 放大（PageUp键） 向下滚动滚轮 --> Zoom Out 缩小（PageDown键） 单击中键 --> Zoom Pan 移动屏幕 (Home键) 2.0版本新增功能： 1.在手动布局时，按鼠标左键移动元件时，再点击右键，可旋转元件。（非常好用的功能） 2.增加鼠标中键手形功能，按住中键，移动鼠标，放开中键，为一个手形功能。 按中键向左移动 --> 在画线时退回上一步（退格键） 按中键向右移动 --> 删除有焦点的对象（Delete键） 按中键向上移动 --> 放置元件时，进入修改元件属性 （Tab键） 按中键向下移动 --> 放置元件时，用于旋转元件（空格键） 按中键向左上移动 --> Zoom Out 缩小（PageDown键） 按中键向右下移动 --> Zoom In 放大（PageUp键） 按中键向右上移动 --> Clear 删除所有选择的对象（Ctrl+Delete键） 按中键向左下移动 --> Fit All Objects 显示所有元件（Ctrl+PageDown键） 3.在PCB、SCH、PCBLib、SCHLib四个编辑器中都能实现本软件的所有功能。
上传时间： 2013-07-02
上传用户：电子世界
555 定时器是一种模拟和数字功能相结合的中规模集成器件。一般用双极性工艺制作的称为 555，用 CMOS 工艺制作的称为 7555，除单定时器外，还有对应的双定时器 556/7556。555 定时器的电源电压范围宽，可在 4.5V~16V 工作，7555 可在 3~18V 工作，输出驱动电流约为 200mA，因而其输出可与 TTL、CMOS 或者模拟电路电平兼容。 555 定时器成本低，性能可靠，只需要外接几个电阻、电容，就可以实现多谐振荡器、单稳态触发器及施密特触发器等脉冲产生与变换电路。它也常作为定时器广泛应用于仪器仪表、家用电器、电子测量及自动控制等方面。555 定时器的内部包括两个电压比较器，三个等值串联电阻，一个 RS 触发器，一个放电管 T 及功率输出级。它提供两个基准电压VCC /3 和 2VCC /3 555 定时器的功能主要由两个比较器决定。两个比较器的输出电压控制 RS 触发器和放电管的状态。在电源与地之间加上电压，当 5 脚悬空时，则电压比较器 A1 的反相输入端的电压为 2VCC /3，A2 的同相输入端的电压为VCC /3。若触发输入端 TR 的电压小于VCC /3，则比较器 A2 的输出为 1，可使 RS 触发器置 1，使输出端 OUT=1。如果阈值输入端 TH 的电压大于 2VCC/3，同时 TR 端的电压大于VCC /3，则 A1 的输出为 1，A2 的输出为 0，可将 RS 触发器置 0，使输出为 0 电平。
上传时间： 2013-10-15
上传用户：PresidentHuang
Abstract: For many first-time users, finding the right logger that meets their needs can be a challenging task. In simple
上传时间： 2014-01-19
上传用户：缥缈
The LM20, LM45, LM50, LM60, LM61, and LM62 are analog output temperature sensors. They have various output voltage slopes (6.25mV/°C to 17mV/°C) and power supply voltage ranges (2.4V to 10V).The LM20 is the smallest, lowest power consumption analog output temperature sensor National Semiconductor has released. The LM70 and LM74 are MICROWIRE/SPI compatible digital temperature sensors. The LM70 has a resolution of 0.125°C while the LM74 has a resolution of 0.625°C. The LM74 is the most accurate of the two with an accuracy better than ±1.25°C. The LM75 is National’s first digital output temperature sensor, released several years ago.
上传时间： 2014-12-23
上传用户：yl8908
ANALOG INPUT BANDWIDTH is a measure of the frequencyat which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency at which the output is −3dB relative to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethat just causes the output code to transition to the firstcode and the negative reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note that this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specification which appliesto ADCs with differential inputs. It is the change in theoutput code that occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
上传时间： 2013-11-12
上传用户：pans0ul
Power conversion by virtue of its basic role produces harmonics due to theslicing of either voltages or currents. To a large extent the pollution in theutility supply and the deterioration of the power quality has been generatedor created by non-linear converters. It is therefore ironic that power convertersshould now be used to clean up the pollution that they helped to create inthe first place.In a utility system, it is desirable to prevent harmonic currents (which resultin EMI and resonance problems) and limit reactive power flows (whichresult in transmission losses).Traditionally, shunt passive filters, comprised of tuned LC elements andcapacitor banks, were used to filter the harmonics and to compensate forreactive current due to non-linear loads. However, in practical applicationsthese methods have many disadvantages.
上传时间： 2013-11-05
上传用户：AISINI005
PCI ExpressTM Architecture Add-in Card Compliance Checklist for the PCI Express Base 1.0a SpecificationThe PCI Special Interest Group disclaims all warranties and liability for the use of this document and the information contained herein and assumes no responsibility for any errors that may appear in this document, nor does the PCI Special Interest Group make a commitment to update the information contained herein.Contact the PCI Special Interest Group office to obtain the latest revision of this checklistQuestions regarding the ths document or membership in the PCI Special Interest Group may be forwarded tPCI Special Interest Group5440 SW Westgate Drive #217Portland, OR 97221Phone: 503-291-2569Fax: 503-297-1090 DISCLAIMERThis document is provided "as is" with no warranties whatsoever, including any warranty of merchantability, noninfringement, fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification, or sample. The PCI SIG disclaims all liability for infringement of proprietary rights, relating to use of information in this specification. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted herein.
标签： Architecture ExpressTM PCI
上传时间： 2013-11-03
上传用户：gy592333
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.
上传时间： 2014-12-23
上传用户：han_zh
