| ID: | 4233 |
| From: | gene glick <ge...@optonline.net> |
| Date: | Mon, 29 Jun 2020 19:40:25 -0400 |
| Subject: | Re: [pcb-rnd] Off topic (maybe) - Spice simulator |
| in-reply-to: | 4228 from Robin Laing <Me...@TelusPlanet.net> |
| replies: | 4247 from Robin Laing <Me...@TelusPlanet.net> |
--000000000000d6388905a941959a Content-Type: text/plain; charset="UTF-8" Maybe you should ask why do they want such perfect models? No matter what, your models will only approximate reality - so you just need to know how close is good enough. Simulation really should only confirm what you already know. When it doesn't work as expected, you ask why, and maybe you missed something - sometimes it's something important. If you rely on someone's model, you are trusting that it's okay....sometimes, they are not. It's up to you, the engineer, to know what your circuit does. Have you ever heard of an engineer, looking over a charred, smoking mess that should have been a circuit, and hear them say "it looked good in simulation" :D Happens a lot! On Fri, Jun 26, 2020 at 4:45 PM Robin Laing <MeSat@telusplanet.net> wrote: > I wish I could beat this into some peoples brains. They expect models > to be perfect all the time. > > I have been told that if the model isn't working, then we have to look > at different tools to model it better. I think that is part of the > issue in this case. Simulation says one thing, real world says > something else. In our case, the real world is the problem and we do > need to be closer to the simulation. I am thinking that the real world > is related to the way that the circuit was constructed as a big part to > the issues. > > Robin > > > > --000000000000d6388905a941959a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>Maybe you should ask why do they want such perfect mo= dels? No matter what, your models will only approximate reality - so you ju= st need to know how close is good enough. Simulation really should only con= firm what you already know. When it doesn't work as expected, you ask w= hy, and maybe you missed something - sometimes it's something important= . If you rely on someone's model, you are trusting that it's okay..= ..sometimes, they are not. It's up to you, the engineer, to know what y= our circuit does. <br></div><div></div><div><br></div><div>Have you ever he= ard of an engineer, looking over a charred, smoking mess that should have b= een a circuit, and hear them say "it looked good in simulation" := D Happens a lot!<br></div><div><br></div><div><br></div><br><div class=3D"g= mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jun 26, 2020 at 4= :45 PM Robin Laing <<a href=3D"mailto:MeSat@telusplanet.net">MeSat@telus= planet.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style= =3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding= -left:1ex"> I wish I could beat this into some peoples brains.=C2=A0 They expect models= <br> to be perfect all the time.<br> <br> I have been told that if the model isn't working, then we have to look = <br> at different tools to model it better.=C2=A0 I think that is part of the <b= r> issue in this case.=C2=A0 Simulation says one thing, real world says <br> something else.=C2=A0 In our case, the real world is the problem and we do = <br> need to be closer to the simulation.=C2=A0 I am thinking that the real worl= d <br> is related to the way that the circuit was constructed as a big part to <br= > the issues.<br> <br> Robin<br> <br> <br> <br> </blockquote></div></div> --000000000000d6388905a941959a--
Reply subtree:
4233 Re: [pcb-rnd] Off topic (maybe) - Spice simulator from gene glick <ge...@optonline.net>
4247 Re: [pcb-rnd] Off topic (maybe) - Spice simulator from Robin Laing <Me...@TelusPlanet.net>