Article View: sci.physics
Article #15451Re: Query - How valves and transistors work
From: John Woodgate
Date: Wed, 30 Dec 1998 00:00
Date: Wed, 30 Dec 1998 00:00
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<76dss3$fhq$1@computer.my.domain>, Duncan Barclay <dmlb@ragnet.demon.co.uk> wrote: >I do know what I am talking about, Chapter 2 of my D. Phil thesis >describes in detail GaAs MESFET modelling and I have spent the last >three years designing BJT RFICs. Oh, my goodness. I didn't realise I was commenting on the opinions of a *real expert*. Goodness, whatever next? The enquirer is clearly a beginner, who needs the maximum assistance to understand the topics that he will be exposed to. It is very likely that, if he is not frustrated by over-rigorous expositions, he will soon come across circuit analysis software, such as SPICE, which uses controlled-source models. It will be no help to him to have been told that the *only* valid controlled-source model is the VCCS, even though that corresponds to the physical model of controlled conduction that you advocate. The exclusive adoption of the VCCS model for valves, bipolars and FETs would actually obscure the essential differences between them, at least up to undergraduate level. I can't see any good reason for not mentioning that the configuration of the device when in use affects the optimum choice of controlled-source model. -- Regards, John Woodgate, Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. OOO - Own Opinions Only. You can fool all of the people some of the time, but you can't please some of the people any of the time.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fcc1a,6f59d673fceaf3aa X-Google-Attributes: gidfcc1a,public X-Google-Thread: 114713,6f59d673fceaf3aa X-Google-Attributes: gid114713,public X-Google-Thread: 10b271,6f59d673fceaf3aa X-Google-Attributes: gid10b271,public X-Google-Thread: 111d0a,6f59d673fceaf3aa X-Google-Attributes: gid111d0a,public X-Google-Thread: 1118be,6f59d673fceaf3aa X-Google-Attributes: gid1118be,public X-Google-Thread: 1110fe,6f59d673fceaf3aa X-Google-Attributes: gid1110fe,public X-Google-Thread: 107d45,6f59d673fceaf3aa X-Google-Attributes: gid107d45,public X-Google-Thread: 112d1e,6f59d673fceaf3aa X-Google-Attributes: gid112d1e,public From: John Woodgate <jmw@jmwa.demon.co.uk> Subject: Re: Query - How valves and transistors work Date: 1998/12/30 Message-ID: <d1dLzCAjKri2EwAr@jmwa.demon.co.uk> X-Deja-AN: 427384163 Distribution: world X-NNTP-Posting-Host: jmwa.demon.co.uk:158.152.135.100 References: <368691bc.0@stargazer.actinet.net> <76b08g$jo4$1@news-1.news.gte.net> <76b8i0$rqm$1@computer.my.domain> <fuNEGVAumei2EwR5@jmwa.demon.co.uk> <76dss3$fhq$1@computer.my.domain> X-Complaints-To: abuse@demon.net X-Trace: news.demon.co.uk 915087400 nnrp-05:26976 NO-IDENT jmwa.demon.co.uk:158.152.135.100 Organization: JMWA Electronics Consultancy MIME-Version: 1.0 Newsgroups: sci.physics,fj.sci.physics,sci.physics.electromag,tnn.physics,news.electronics.basics,sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.misc