使用暫態分析模擬出phasenoise @ MMSIM701

gyamwoo

原文連結
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7 P0 F7 w+ A% \! G2 ]6 T, R以下原文內容：

Calculating Large Signal Phase Noise Using Transient Noise Analysis
By Alan Whittaker on March 26, 2009

- y. y3 h3 `; j- P# |( qMy 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
4 h, ]0 K. s9 v6 G' A, Mduring 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
( f+ q+ B& P  m, d, E6 P7 E! }resolve issues that users have run into during the front-end analog, RF and
$ |" {7 j& M. E% I/ cmixed-signal design process.
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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
7 v& r" p& W& j/ h4 S, Vour small signal phase noise analysis which is available using either pnoise
; L+ z& `. d% mor hbnoise analysis in the SpectreRF option to Spectre.
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Here are the steps to obtain a phase noise plot from transient noise analysis:
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6 h; I$ C* y$ \& I, N1.  Set up your oscillator testbench circuit for a transient noise analysis
(See sourcelink for the Transient Noise appNote - it doesn't discuss the phase
; K  e8 S' h4 L+ N: e: Snoise measurement, but describes how to properly set up the simulation analysis

; M' P5 u, Y: h+ u2.  Add the block freq_meter from the pllMMLib library
($CDSHOME/tools//dfII/samples/artist/pllMMLib)
to the testbench circuit. Important: The instance name for this block must be
- v) U! Y( s7 C) {8 k  y. J3 I'vco_freq'.
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If the oscillator output is differential, connect it to the vin_p and vin_n
pins on the freq_meter block. If the oscillator output is single ended, connect
it to the vin_p pin and connect the vin_n pin to ground. Connect a noConn cell
" w% F( u1 Q. s% x$ V1 @from the basic library to the out_freq pin.

gyamwoo

The parameters for this block are (set Tools Filter to veriloga in the CDF
. M9 W/ h: Y: J- H# `; m- A3 l7 G& eparameter form:
+ \$ ]* |$ Y# j, s; |8 s+ V    *
6 [; i" v. z6 h6 G. l5 s2 V" m      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.
& V! M5 U9 p% b0 {5 k    *
3 n. N8 N; ]0 K9 L1 e, V      ttol: The tolerance of the time where the rise edge is determined. Default
is 1p.
    *
$ i- l6 T$ N1 l0 R1 y; D# q8 p' L+ l      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
3 f* i( F8 `1 F- T3 {) E$ \noise measurements, set this to past the time when the oscillator is fully
powered up and oscillating at the design frequency.
' G% K9 d- }9 \* \( U1 b: d    *
      outfile: The name of a file to contain time-dependent periods for use in
8 r  }1 V. @9 m$ h$ clater psd calculations. Specify just the file name, not a path. If outfile is
5 N! |5 ^4 N: S+ a2 ]; J$ Dleft blank, the default name is periods.txt.

gyamwoo

3.  Before starting the simulation, in the ADE window, Select Tools->RF->LL. In the PLL Macro Model Wizard window, enable PLL Macro Model and select PLL Bench as the Bench Type. Then OK this form.

2 ]+ r  M9 e8 {% m4.  Run the simulation. The simulation must run successfully to completion in order to get to the phase noise results.
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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.
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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.

8 X: O6 i, L6 K* rImportant note: You will need to use MMSIM701 and IC5141USR5 or IC613 (or latersubversions) to obtain a phase noise plot from transient noise analysis.

4 r" Y8 p5 @9 P% Q' b4 k我用的是mmsim620，也不能模。有人可以模擬出來的回個文，show個圖給大家看吧

macrohan

show you my simulation result
0 T, _) }( y! {) d1 V+ L  Q!!!
!!!!!!!!!!!
!!!!!!

gyamwoo

謝謝你的回覆，我最近拿到新的軟體也開始在測試mmsim7了
我發現turbo與multi thread的設定不同會對結果造成很大的不同。
還有這個phase noise的訊號的範圍跟transient noise的設定與transient 的設定都有很緊密的關係。
; R6 Y4 J: T, ?1 ]$ Y( o/ w不知道該怎麼作設定才是比較準確的

kunhsun

請問有更詳盡的使用方法嗎

duoyun

也去试试这个流程。关于pll相噪仿真还有其他方法吗？