Talk:Transconductance

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[edit] Objective

this Should be a general description of what the term means, and then a description of transistor and vacuum tube properties.

probably copyrighted definitions:

General: Transconductance Transconductance is a property similar to both gain and conductance. When conductance is the will to generate an current for an apply voltage at to connecting points is the transconductance the will to generate an output current at the output connecting points for and applied input voltage at the input connecting points.

Specific applications: Transconductance Amplifier An amplifier which has an transconductance instead of ordinary voltage gain. Transconductance amplifiers can be of great use in some cursuits and is are better suited to drive certain loads (consider an speaker and the speaker cable). There exists transconductance amplifiers similar to operational amplifiers usually refered to as OTAs.

TRANSCONDUCTANCE—Transconductance is a ratio of the change in plate current to a change in grid voltage with the plate voltage held constant. Transconductance (gm) is usually expressed in micromhos or millimhos.

parameter defining conditions for current flow in the channel of Field Effect Transistors (FETs); the derivative of the output current over input voltage

[edit] Split?

We have a few related concepts. Transconductance, transresistance, transadmittance, and transimpedance. Which ones should have their own articles? If they are combined into one article, what should the title be? — Omegatron 15:30, 24 July 2006 (UTC)

Transconductance is a far more widely used concept than transresistance I feel. I think transresistance is given far too much weight in the article, but I dont think it warrants its own page either.--Light current 02:22, 26 July 2006 (UTC)

This transresistance amplifier hooey seems to have been coined by Maxim. Its nothing special as its only an op amp with a FB resistor (surprise). Who else uses the terms 'transresistance' (or transimpedance). I dont think Ive heard of them before seeing them here.--Light current 02:31, 26 July 2006 (UTC)

Just because you personally haven't heard of something doesn't mean we should take it out of articles. Lots of people use the terms. — Omegatron 13:50, 26 July 2006 (UTC)

I'd say all these articles should be merged into a good discussion of two-port networks since the parameters are more or less directly as a result of two port modeling. -- mattb @ 2006-11-23T00:14Z

[edit] Removed from page

Yet another term, this time coined by National Semiconductor in the early 1970s with the introduction of their LM3900 [1], is the eponymous Norton amplifier. The Norton amplifier produces an output voltage proportional to the difference between the currents flowing into its two inputs.

What has this to do with transconductance?--Light current 02:17, 26 July 2006 (UTC)

That would be a transresistance amplifier, not transconductance. — Omegatron 13:41, 26 July 2006 (UTC)