The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3DFB4A18.email@example.com> <22OK9.1120$TY1.firstname.lastname@example.org>
Subject: Re: SPICE simulation goes awry?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Mon, 16 Dec 2002 15:39:27 -0000
NNTP-Posting-Date: Mon, 16 Dec 2002 15:39:30 GMT
Paul Burridge wrote:
> On Sat, 14 Dec 2002 22:13:12 -0000, "Kevin Aylward"
> opined thusly:
>> You haven't done very much simulation then:-)
> Nope. I'm a SPICE virgin. :-)
>> As the man said. Its convenient and quick. It can be quite useful to
>> knock up basic functional circuits just to checkout the overall
>> system concepts before you get bothered with the explicit details.
>> People even use tools like MathCAD to do their level electronic
>> system design.
>> How do you know what can be achieved in the ideal case if you don't
>> try it with ideal components? It saves a lot of needless effort if
>> you can determine that ideal components are not good enough. It
>> gives a target to work to. It also allows you to evaluate just what
>> part of a design is being a main limiting factor by comparing the
>> real with the ideal.
> Okay, thanks for that, Kevin. I feel a little less ignorant now.
>> With all due respect here, once you do get around to doing *lots* of
>> simulation, i.e. 40 hours a week, you'll get a better idea of how
>> useful ideal components are in checking out ideas quickly.
> I think I'd sooner spend a week in the slammer. :-)
> Since you obviously know a fair bit about simulators, can you tell me
> what the following specific simulations are used to investigate:-
> Transient Analysis
This gives a run of voltage/current against time. Its is equivalent to
what you would see on an oscilloscope.
> Network Analysis
This is not really a spice term. "AC Analysis" is the run type that you
do to get a graph of ac volts/current against frequency, i.e. a
frequency response graph. Ususlly you use an input of 1 vilt so that all
plots are gains.
> DC sweep
This is where you varying dc voltage say a power supply, and then see ho
all the bias voltages and currants change with that supply.
> DC operating point
This is all the dc voltages and currents at circuit nodes with out any
> Monte Carlo analysis
This is just a random variation of component values in runs of the above
type. Its used to see if a circuit will make it in production. This can
be of limited use, as to running lots of transient runs can take a lot
of time. Worst Case,is often used instead. This sets components at their
maximum and minimum values instead of using random values.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup