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Article #15434Re: Query - How valves and transistors work
From: Roy McCammon
Date: Mon, 04 Jan 1999 00:00
Date: Mon, 04 Jan 1999 00:00
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John Woodgate wrote: > Triodes are a different matter. The ra is lowish, and the optimum load > resistance for best linearity is also in the order of ra. So they are > neither fish nor fowl. They were usually treated as VCVS, with > 'amplification factor' [mu] = dVak/dVgk at constant Ia, and stage > voltage gain =[mu].Ra/(Ra+ra). Thanks for the info. Again speculating from very little info, I again wonder if the lowish ra in a triode wasn't because of capacitive feedback. Were these things charcterized by a gain-bandwidth product like compensated op-amps whereby the gain went down as 1/f ?
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 107d45,6f59d673fceaf3aa X-Google-Attributes: gid107d45,public X-Google-Thread: fcc1a,6f59d673fceaf3aa X-Google-Attributes: gidfcc1a,public X-Google-Thread: 1110fe,6f59d673fceaf3aa X-Google-Attributes: gid1110fe,public X-Google-Thread: 10b271,6f59d673fceaf3aa X-Google-Attributes: gid10b271,public X-Google-Thread: 112d1e,6f59d673fceaf3aa X-Google-Attributes: gid112d1e,public X-Google-Thread: 111d0a,6f59d673fceaf3aa X-Google-Attributes: gid111d0a,public X-Google-Thread: 114713,6f59d673fceaf3aa X-Google-Attributes: gid114713,public X-Google-Thread: 1118be,6f59d673fceaf3aa X-Google-Attributes: gid1118be,public From: Roy McCammon <rbmccammon@ieee.org> Subject: Re: Query - How valves and transistors work Date: 1999/01/04 Message-ID: <36918728.5ED6F1BF@ieee.org> X-Deja-AN: 428879732 Content-Transfer-Encoding: 7bit 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$1@computer.my.domain> <d1dLzCAjKri2EwAr@jmwa.demon.co.uk> <76ibj9$rhc$1@computer.my.domain> <76ja03$gud$1@news-2.news.gte.net> <36902872.9500D4B6@ieee.org> <FGjCsOAN6Gk2EwhO@jmwa.demon.co.uk> To: John Woodgate <jmw@jmwa.demon.co.uk> X-Server-Date: 5 Jan 1999 03:29:24 GMT Content-Type: text/plain; charset=us-ascii Organization: MindSpring Enterprises Mime-Version: 1.0 Reply-To: rbmccammon@ieee.org 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