购买深圳网站定制开发,摄影师个人网站怎么做,网页设计师工资一般多少钱,禾天姿网站开发Sigrity SPEED2000 Power Ground Noise Simulation模式如何进行电源阻抗仿真分析操作指导(一)-无电容 Sigrity Power Ground Noise Simulation模式同样可以用来观测电源网络的自阻抗#xff0c;以下图为例进行说明 2D 视图 3D view 本例要观测的是U17端口处的自阻抗#xff0…Sigrity SPEED2000 Power Ground Noise Simulation模式如何进行电源阻抗仿真分析操作指导(一)-无电容 Sigrity Power Ground Noise Simulation模式同样可以用来观测电源网络的自阻抗以下图为例进行说明 2D 视图 3D view 本例要观测的是U17端口处的自阻抗通过观测电压和电流的时域波形然后计算得出 具体操作如下
首先切换到Power Ground Noise Simulation模式 点击Check Stackup 确保层叠信息无误点击ok 点击Prepare Power Ground Nets选择Skip setup P/G nets,跳过设置电源地 自动跳转到Net Manager界面使能VCC和GND以及D2-D4信号网络 点击Assign Capacitor Models设置电容模型
由于本例中电容不参与仿真所以跳过这步 点击Add Excitation设置激励 跳转到Component Manager界面选中Vsource点击edit 弹出Edit Model界面 在definition中定义激励源参数为高斯波形
Vs 2 0 Gaussian(0 1 1.0n 0.7n 1)
Rs 2 1 2 高斯波形参数说明如下本例中将电流换成电压 点击ok关闭页面 将Redge定义为终端电阻电阻为0.01ohm 回到workflow点击Setup VRAMDecaps设置VRAM和电容本例中不需要设置直接跳过 点击Specify Sim TimeOptions,设置仿真时长为20ns点击ok 点击Specify Observations(Voltage)设置电压观测点本例设置电压观测点为Vsource 点击Specify Observations(Current)设置电流观测点点击Vsource的Rs点击add添加好电流观测点 点击Auto Mesh size进行自动网格设置 点击error Check and Warning 检查错误和警告 点击Save保存文件 弹出界面点击ok 点击Start Simulation开始仿真 点击ok 仿真结束后点击Window选择2D Curves查看2D曲线 可以看到Vsource端的电压和电流时域曲线 接下来通过公式计算阻抗频域曲线在time domain下拉选择Amplitude 视图切换到电压和电流的频域曲线 在结果界面空白处鼠标右击选择FD Calculate进行频域计算 弹出Fourier Calculator进行傅里叶变换 切换到Simple Calculation最左边选择V1中间选择/(表示除以)最右边选择C1然后点击ok 得到vsource端的自阻抗曲线可以看到在0hz的时候谐振幅度较大 当然不仅仅是0hz的幅度很大在更高频段也很大只是相比0hz幅度视图看起来不明显如680Mhz幅度也达到了63.5262 选中曲线鼠标右击选择Save 命名成curve-no decap点击保存便于后续结果的比较 除了可以计算阻抗曲线外还可以计算电源地的有效电感 结果如下 Along with accuracy and efficiency, SPEED2000 provides an analysis flow that is particularly valuable for design simulations that benefit from direct time domain observation. SPEED2000 can read databases from popular package and board design tools. Chip data can also be incorporated into the same file for co-simulation. This provides an environment for accessing the impact of noise propagation throughout the entire structure. Circuits in the combined design are linked with SPICE circuit files. Simulation parameters and excitation are added by the user; however, the user does not need to create special purpose models. SPEED2000 directly provides voltage and current waveforms. SPEED2000 is particularly effective to be used for, but it is not limited to, the following applications: ■ Computation of power and ground noise. ■ Determination of decoupling capacitor placement, including the number, values, and locations of decoupling capacitors ■ Determination of frequency-dependent port parameters of packages, such as port input impedances, S parameters, and transfer functions between different ports ■ Evaluation and design of power and ground distribution systems, including power and ground plane arrangement, and power and ground via / pin assignment ■ Evaluation of electromagnetic coupling between different components ■ Evaluation of electromagnetic radiation from packages and printed circuit boards ■ Evaluation of signal and noise spectrum at various locations ■ Evaluation of signal and noise waveforms at various locations ■ Identification of package resonance. SPDGEN and SPDSIM SPEED2000 is composed of two executable modules: SPDGEN and SPDSIM. ■ SPDGEN — Provides a graphical user interface so the user can conveniently build and modify package components and establish simulation parameters ■ SPDSIM — Provides the transient simulation engine that processes and displays the package components. SPDSIM also provides a post processing interface so the user can analyze, compare and print the results of package simulation The SPDSIM simulations are entirely controlled by what the user establishes and sets up in the SPDGEN package editor. SPEED2000 provides powerful 3D editing functions using the SPDGEN module. Before the.spd file (representing your package) is loaded into the SPDSIM module, the viewing and simulation parameters need to be specified within the.spd file using the SPDGEN module. In addition to simulation, the SPDSIM module provides a post processing interface so the user can analyze, compare, save, export and print the results of package simulation. ■ The SPDGEN module provides the GUI-based package geometry editor and file builder, it is used to create and edit the SPEED file (.spd) which contains package geometry and simulation parameters ■ The SPDGEN Graphical User Interface (GUI) makes convenient “what if” analysis of a package design possible; that is, a user can conveniently engineer a possible solution to a problem (made apparent during the simulation) then simulate the new model to see the results of changes made ■ The SPDSIM module loads and executes a transient simulation of the .spd file created by SPDGEN. It should be noted that SPDSIM does not change the .spd file contents. Use SPDGEN to select which components of a package design will be simulated
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