What is Transconductance?
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 16th November 2003, 06:37 PM #1 Svetlana   diyAudio Member   Join Date: Oct 2003 Location: Christchurch What is Transconductance? What importance is this the Transconductance figure (Siemens) , in relatition to hexfets in hi-fi amps?
 16th November 2003, 07:01 PM #2 hitsware diyAudio Member   Join Date: Mar 2002
 16th November 2003, 10:36 PM #3 PMA   diyAudio Member     Join Date: Apr 2002 Location: Prague Ratio of output current change to input voltage change. Gm=dId/dUgs Id ... drain current Ugs ... gate-source voltage Gm ... transconductance
 17th November 2003, 04:00 AM #4 Nelson Pass   The one and only     Join Date: Mar 2001 Even more simply: If the transconductance is 1, then there is a 1 amp change is Drain-Source Current for every 1 volt of Gate-Source voltage change. If the transconductance is 2, then there is a 2 amp change is Drain-Source Current for every 2 volt of Gate-Source voltage change. and so on, this with transconductance expressed in Siemens, which is the inverse of ohms.
hitsware
diyAudio Member

Join Date: Mar 2002
Quote:
 Originally posted by Nelson Pass Even more simply: If the transconductance is 1, then there is a 1 amp change is Drain-Source Current for every 1 volt of Gate-Source voltage change. If the transconductance is 2, then there is a 2 amp change is Drain-Source Current for every 2 volt of Gate-Source voltage change. and so on, this with transconductance expressed in Siemens, which is the inverse of ohms.
Then all transconductances are = ?
I think if gm=2 then you get a 4amp change for 2volt change

Steve Eddy
diyAudio Member

Join Date: Sep 2002
Location: Sacramento, CA
Quote:
 Originally posted by Nelson Pass and so on, this with transconductance expressed in Siemens, which is the inverse of ohms.
Yeah, but Siemen sounds so... um... biological. I rather liked it when the unit really was the inverse of ohms; mhos. But alas, we've lost our mhojo.

se

 17th November 2003, 04:19 AM #7 hitsware diyAudio Member   Join Date: Mar 2002 gimee mo...........................joe .
 17th November 2003, 04:39 AM #8 Nelson Pass   The one and only     Join Date: Mar 2001 That's nothing. In the old days they granted the right of the discoverer to name the element. According to Cyclotronguy, this no longer exists, and in fact they have renamed a number of the higher elements. This probably explains why you don't see Kentium on the periodic table of the elements.
hitsware
diyAudio Member

Join Date: Mar 2002
i still think this ain't right

Quote:
 Originally posted by Nelson Pass Even more simply: If the transconductance is 1, then there is a 1 amp change is Drain-Source Current for every 1 volt of Gate-Source voltage change. If the transconductance is 2, then there is a 2 amp change is Drain-Source Current for every 2 volt of Gate-Source voltage change. and so on, this with transconductance expressed in Siemens, which is the inverse of ohms.

Steve Eddy
diyAudio Member

Join Date: Sep 2002
Location: Sacramento, CA
Quote:
 Originally posted by Nelson Pass That's nothing. In the old days they granted the right of the discoverer to name the element. According to Cyclotronguy, this no longer exists, and in fact they have renamed a number of the higher elements. This probably explains why you don't see Kentium on the periodic table of the elements.
Hehehe. Yeah, but many of them are named after persons. Such as Lawrencium (after E. O. Lawrence), Nobelium (after Alfred Nobel), Mendelevium (after Dmitri Mendeleev), etc.

Guess we just have to wait 'til someone named Kent becomes worthy of such an honor.

se

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