Shaped Noise Source (Simulation)
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From: Jim Thompson on 7 Feb 2010 17:15 Anyone with experience in creating a shaped noise source for AC analysis/simulation in Spice/PSpice/LTspice? EFREQ in PSpice is a bit of a kluge to use :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Stephan Goldstein on 8 Feb 2010 07:52 On Sun, 07 Feb 2010 15:15:05 -0700, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >Anyone with experience in creating a shaped noise source for AC >analysis/simulation in Spice/PSpice/LTspice? > >EFREQ in PSpice is a bit of a kluge to use :-( > > ...Jim Thompson I'm not familiar with PSpice/LTspice (we use a proprietary simulator), but if you have a white noise source, why not build a passive frequency-shaping network and buffer its output with a vcvs? Do you want to do this in the frequency domain, or the time domain? Just curious. steve
From: Jim Thompson on 8 Feb 2010 09:55 On Mon, 08 Feb 2010 07:52:03 -0500, Stephan Goldstein <sgoldHAM(a)alum.mit.edu> wrote: >On Sun, 07 Feb 2010 15:15:05 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: > >>Anyone with experience in creating a shaped noise source for AC >>analysis/simulation in Spice/PSpice/LTspice? >> >>EFREQ in PSpice is a bit of a kluge to use :-( >> >> ...Jim Thompson > >I'm not familiar with PSpice/LTspice (we use a proprietary >simulator), but if you have a white noise source, why not >build a passive frequency-shaping network and buffer its >output with a vcvs? > >Do you want to do this in the frequency domain, or the >time domain? Just curious. > >steve Frequency domain. What you suggest is what I ended up doing... white noise run thru EFREQ to shape, but using a text editor to roll my own EFREQ... PSpice working window sucks :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Robert Macy on 8 Feb 2010 11:17 On Feb 8, 6:55 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- Site.com> wrote: > On Mon, 08 Feb 2010 07:52:03 -0500, Stephan Goldstein > > > > > > <sgold...(a)alum.mit.edu> wrote: > >On Sun, 07 Feb 2010 15:15:05 -0700, Jim Thompson > ><To-Email-Use-The-Envelope-I...(a)My-Web-Site.com> wrote: > > >>Anyone with experience in creating a shaped noise source for AC > >>analysis/simulation in Spice/PSpice/LTspice? > > >>EFREQ in PSpice is a bit of a kluge to use :-( > > >> ...Jim Thompson > > >I'm not familiar with PSpice/LTspice (we use a proprietary > >simulator), but if you have a white noise source, why not > >build a passive frequency-shaping network and buffer its > >output with a vcvs? > > >Do you want to do this in the frequency domain, or the > >time domain? Just curious. > > >steve > > Frequency domain. What you suggest is what I ended up doing... white > noise run thru EFREQ to shape, but using a text editor to roll my own > EFREQ... PSpice working window sucks :-( > > ...Jim Thompson > -- > | James E.Thompson, CTO | mens | > | Analog Innovations, Inc. | et | > | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | > | Phoenix, Arizona 85048 Skype: Contacts Only | | > | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | > | E-mail Icon athttp://www.analog-innovations.com| 1962 | > > I love to cook with wine. Sometimes I even put it in the food. If it's just to create a table, use a myriad of script languages. One example, octave [free Matlab clone] can easily convert a formula of what you want into a PSpice compatible statement for you. Automatically doing the step between shape and table that you've been doing with a text editor, Plus, you can make the table variable resolution. Frequency steps anything you want. Do you have the shape in the form of a formula, output vs frequency?
From: Jim Thompson on 8 Feb 2010 11:22
On Mon, 8 Feb 2010 08:17:18 -0800 (PST), Robert Macy <macy(a)california.com> wrote: >On Feb 8, 6:55�am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- >Site.com> wrote: >> On Mon, 08 Feb 2010 07:52:03 -0500, Stephan Goldstein >> >> >> >> >> >> <sgold...(a)alum.mit.edu> wrote: >> >On Sun, 07 Feb 2010 15:15:05 -0700, Jim Thompson >> ><To-Email-Use-The-Envelope-I...(a)My-Web-Site.com> wrote: >> >> >>Anyone with experience in creating a shaped noise source for AC >> >>analysis/simulation in Spice/PSpice/LTspice? >> >> >>EFREQ in PSpice is a bit of a kluge to use :-( >> >> >> � � � � � � � � � � � � � � � � � � � �...Jim Thompson >> >> >I'm not familiar with PSpice/LTspice (we use a proprietary >> >simulator), but if you have a white noise source, why not >> >build a passive frequency-shaping network and buffer its >> >output with a vcvs? >> >> >Do you want to do this in the frequency domain, or the >> >time domain? �Just curious. >> >> >steve >> >> Frequency domain. �What you suggest is what I ended up doing... white >> noise run thru EFREQ to shape, but using a text editor to roll my own >> EFREQ... PSpice working window sucks :-( >> >> � � � � � � � � � � � � � � � � � � � � ...Jim Thompson [snip] > >If it's just to create a table, use a myriad of script languages. > >One example, octave [free Matlab clone] can easily convert a formula >of what you want into a PSpice compatible statement for you. >Automatically doing the step between shape and table that you've been >doing with a text editor, Plus, you can make the table variable >resolution. Frequency steps anything you want. > >Do you have the shape in the form of a formula, output vs frequency? For now, I have just a graph, but I expect to have data points (tabular) in the future. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |