Shaped Noise Source (Simulation)
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From: MooseFET on 8 Feb 2010 11:57 On Feb 8, 8:22 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- Site.com> wrote: > On Mon, 8 Feb 2010 08:17:18 -0800 (PST), Robert Macy > > > > > > <m...(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. Do you want the output as a spreadsheet with a column for freq and another from amplitude? Do you use open office? If yes to both I may have a cool solution for you. > > ...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.
From: Robert Macy on 9 Feb 2010 13:45 On Feb 8, 8:22 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- Site.com> wrote: > On Mon, 8 Feb 2010 08:17:18 -0800 (PST), Robert Macy > > > > > > > > <m...(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 athttp://www.analog-innovations.com| 1962 | > > I love to cook with wine. Sometimes I even put it in the food. There are tons of free programs that take a scanned grpah and return data points. From the chatter on the groups, they appear fairly good. Even much better than the way I do it...point by point by insidious point.
From: Jim Thompson on 9 Feb 2010 13:50 On Tue, 9 Feb 2010 10:45:24 -0800 (PST), Robert Macy <macy(a)california.com> wrote: >On Feb 8, 8:22�am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- >Site.com> wrote: >> On Mon, 8 Feb 2010 08:17:18 -0800 (PST), Robert Macy >> >> >> >> >> >> >> >> <m...(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 [snip] > >There are tons of free programs that take a scanned graph and return >data points. From the chatter on the groups, they appear fairly >good. Even much better than the way I do it...point by point by >insidious point. Interesting! Got any links? ...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 9 Feb 2010 17:14
On Feb 9, 10:50 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My- Web-Site.com> wrote: > On Tue, 9 Feb 2010 10:45:24 -0800 (PST), Robert Macy > > > > > > > > <m...(a)california.com> wrote: > >On Feb 8, 8:22 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- > >Site.com> wrote: > >> On Mon, 8 Feb 2010 08:17:18 -0800 (PST), Robert Macy > > >> <m...(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 > [snip] > > >There are tons of free programs that take a scanned graph and return > >data points. From the chatter on the groups, they appear fairly > >good. Even much better than the way I do it...point by point by > >insidious point. > > Interesting! Got any links? > > ...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. No, lost them with those 8 HD crashes within 2 years and several backed up the others! so URLs got lost googel search? |