Talk:Small-signal model
Latest comment: 4 years ago by Doug iowa in topic This page does not make a lot of sense
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Should this article be renamed and cover both small and large signal models? — Omegatron 19:41, 5 November 2006 (UTC)
- No. I've never even heard of a latter type of model but there are plenty small signal models. If anything this article should be expanded on the different types of models. I know there is a bunch for BJTs and at least one for mosfets. It's a pretty big subject. Adam Y. 13:57, 15 November 2006 (UTC)
- Large signal models are what you use to model the more complete behavior of devices. For well characterized devices like BJTs and MOSFETs, there are good large signal models. For some newer devices (like those based on heterojunction technology; HBTs, HEMTs, etc), there do not yet exist very good large signal models. In general, the models used by circuit simulators are derived from large signal models, since the small signal models are mostly useful for quick circuit parameter estimation by designers. Edit: I agree that this page should probably be titled "circuit element modeling" or the like. That would broaden its scope and possibly allow for more content, though I cannot personally contribute heavily at the moment. -- mattb
@ 2006-11-15T16:54Z
- Large signal models are what you use to model the more complete behavior of devices. For well characterized devices like BJTs and MOSFETs, there are good large signal models. For some newer devices (like those based on heterojunction technology; HBTs, HEMTs, etc), there do not yet exist very good large signal models. In general, the models used by circuit simulators are derived from large signal models, since the small signal models are mostly useful for quick circuit parameter estimation by designers. Edit: I agree that this page should probably be titled "circuit element modeling" or the like. That would broaden its scope and possibly allow for more content, though I cannot personally contribute heavily at the moment. -- mattb
This page does not make a lot of sense
editThe page has no example of the linearization procedure, and the section on notation seems gratuitous. Brews ohare (talk) 17:05, 6 January 2008 (UTC)
- I have a lot of sympathy for the comment, "This page does not make a lot of sense." I teach the subject in the context of university-level undergraduate engineering. However the section headed, "Variable notation" is exactly what students want as a handy reference. There are a few places throughout the article where the use of the phrase "large signal" is confusing or ambiguous, so I'm going to make a few edits to resolve those ambiguities. A large signal is not necessarily constant with respect to time and it is not a component that can be superimposed on a small signal to get a total signal. A large signal is a signal that in its context, reveals non-linear behavior of the circuit and thus the small-signal theory cannot be used. Doug iowa (talk) 17:28, 17 May 2020 (UTC)
strange
edithttp://en.wikipedia.org/wiki/Small_signal_model and http://en.wikipedia.org/wiki/Small-signal_model exist —Preceding unsigned comment added by 91.179.200.230 (talk) 19:20, 22 January 2009 (UTC)