[情報] 使用mmsim暫態模擬的大訊號分析相位雜뀠…
※ [本文轉錄自 Electronics 看板]
作者: gyamwoo (願神賜福給台灣) 看板: Electronics
標題: [情報] 使用mmsim暫態模擬的大訊號分析相位雜訊(phasenoise)
時間: Thu Aug 27 01:40:12 2009
這個是我在跑pll想要用mmsim 6.2的新增功能"PLL Noise PSD"
去cadence找到的使用方法。
以下貼個原文，以及連結。
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http://tinyurl.com/mmsim 已縮址
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 已經失效了…
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.
-----------------------------------------------------------
我一步一步照著做，做到最後一步滿心歡喜的想要看我PLL的phase noise
結果，看到important note心裡超幹…
請使用mmsim701
請使用mmsim701
請使用mmsim701
我用的是cic有的版本 mmsim620跟ic5141USR6
(／‵Д′)／~ ╧╧ 既然要701後的版本才能用幹嘛mmsim6就release這功能啊…
吊我胃口
可以跟cic建議他們剛買不久的mmsim602快換新的嗎……
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※ 編輯: gyamwoo 來自: 140.115.71.171 (08/27 01:47)
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