※ [本文转录自 Electronics 看板] 作者: gyamwoo (愿神赐福给台湾) 看板: Electronics 标题: [情报] 使用mmsim暂态模拟的大讯号分析相位杂讯(phasenoise) 时间: Thu Aug 27 01:40:12 2009 这个是我在跑pll想要用mmsim 6.2的新增功能"PLL Noise PSD" 去cadence找到的使用方法。 以下贴个原文，以及连结。 ----------------------------------------------------------------- http://tinyurl.com/mmsim 已缩址 Calculating Large Signal Phase Noise Using Transient Noise Analysis By Alan Whittaker on March 26, 2009Comments(0) Filed under: Circuit Design, Custom IC Design, RF Design, MMSIM, Simulators, PLL My name is Alan Whittaker and I'm in Cadence's Custom IC Proliferation Group. We support Cadence's Technical Field Organization (the AEs) and Cadence customers during the introduction and adoption of new and advanced EDA technologies. I'll be posting here from time to time on methodologies and tool features that resolve issues that users have run into during the front-end analog, RF and mixed-signal design process. I'm first going to address how you can perform a large-signal phase noise analysis on a design block such as a VCO using our transient noise analysis capability in our Spectre circuit simulator. This approach is in addition to our small signal phase noise analysis which is available using either pnoise or hbnoise analysis in the SpectreRF option to Spectre. Here are the steps to obtain a phase noise plot from transient noise analysis: 1. Set up your oscillator testbench circuit for a transient noise analysis (See sourcelink for the Transient Noise appNote - it doesn't discuss the phase noise measurement, but describes how to properly set up the simulation analysis 注：sourcelink 已经失效了… 2. Add the block freq_meter from the pllMMLib library ($CDSHOME/tools//dfII/samples/artist/pllMMLib) to the testbench circuit. Important: The instance name for this block must be 'vco_freq'. If the oscillator output is differential, connect it to the vin_p and vin_n pins on the freq_meter block. If the oscillator output is single ended, connect it to the vin_p pin and connect the vin_n pin to ground. Connect a noConn cell from the basic library to the out_freq pin. The parameters for this block are (set Tools Filter to veriloga in the CDF parameter form: * Vthup: Threshold voltage to determine the rise edge of the input waveform. The input waveform period is determined by two adjacent rise edges. Default is 0. * ttol: The tolerance of the time where the rise edge is determined. Default is 1p. * outStart: The time-dependent period of the input waveform is output to the file when the time is greater than outStart. Default is 0. To get accurate phase noise measurements, set this to past the time when the oscillator is fully powered up and oscillating at the design frequency. * outfile: The name of a file to contain time-dependent periods for use in later psd calculations. Specify just the file name, not a path. If outfile is left blank, the default name is periods.txt. 3. Before starting the simulation, in the ADE window, Select Tools->RF->PLL. In the PLL Macro Model Wizard window, enable PLL Macro Model and select PLL Bench as the Bench Type. Then OK this form. 4. Run the simulation. The simulation must run successfully to completion in order to get to the phase noise results. 5. In the Direct Plot form for transient noise there should be a PLL PSD Noise option. This will allow you to plot the phase noise results. If a message appears saying that the PLL Noise PSD data is not available, check steps 3) and 4). If you make any corrections, you will need to re-run the simulation. The phase noise plot will extend from fmin = 4/tstop to fmax = fosc/2, where tstop is the transient noise simulation stop time and fosc is the oscillation frequency of the circuit. Important note: You will need to use MMSIM701 and IC5141USR5 or IC613 (or latersubversions) to obtain a phase noise plot from transient noise analysis. ----------------------------------------------------------- 我一步一步照着做，做到最後一步满心欢喜的想要看我PLL的phase noise 结果，看到important note心里超干… 请使用mmsim701 请使用mmsim701 请使用mmsim701 我用的是cic有的版本 mmsim620跟ic5141USR6 (／‵Д′)／~ ╧╧ 既然要701後的版本才能用干嘛mmsim6就release这功能啊… 吊我胃口 可以跟cic建议他们刚买不久的mmsim602快换新的吗…… -- ┌─┐ ┌─┐ ┌─┐ ┌─┐ ／▔▔＼ ／▔▔＼ ／▔▔＼ ／▔▔＼ 羡慕... 台湾人: │ ││ ││ ││ │ M ◥ ◥ 我的选择比你们多 │2.4ppm││1.8ppm││0.3ppm││3.5ppm│◤ ◥◤ ◥ ˍ ζ_ ● │ ││ ││ ││ │ | | | | ﹨ V█﹚ └───┘└───┘└───┘└───┘￣ ◣（||） ω╯ ㄦ 〈│ --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.115.71.171 ※ 编辑: gyamwoo 来自: 140.115.71.171 (08/27 01:47)