Germanium transisors and gm
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 13th January 2007, 02:38 AM #1 Steve Eddy   diyAudio Member     Join Date: Sep 2002 Location: Sacramento, CA Germanium transisors and gm For silicon transistors, gm is approximately 25/Ic. How does one go about calculating gm for a germanium device? se
 13th January 2007, 04:51 AM #2 sawreyrw   diyAudio Member   Join Date: Apr 2006 Location: Minnesota Transconductance is given by gm=q*Ic/K*T where q=1.602e-19 (electron charge) K=1.380e-23 (Boltzmann's constant) T=Kelvin temperature (degrees Kelvin = degrees Cent + 273=300@ 23 degrees C) This works out to about 38.5*Ic at 300 degrees Kelvin and is the same for both Ge and Si.
Piercarlo
diyAudio Member

Join Date: Nov 2006
Quote:
 Originally posted by sawreyrw Transconductance is given by gm=q*Ic/K*T This works out to about 38.5*Ic at 300 degrees Kelvin and is the same for both Ge and Si.
'Electron voltage" (or speed) is just 25,8 mV at 300 °K (usually rounded up to 26 mV). However, for pratical purposes, is convenient use 30 mV in order to take in account the effective working junction temperature (75-80 °C for non-stressing working condition of bipolar devices).

Hi
Piercarlo

 13th January 2007, 03:38 PM #4 Steve Eddy   diyAudio Member     Join Date: Sep 2002 Location: Sacramento, CA Thanks guys! se

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