From: "Marc H.Popek"
Subject: Re: Ebers-Moll equation OT muze
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
Date: Sat, 30 Nov 2002 03:07:33 GMT
NNTP-Posting-Date: Sat, 30 Nov 2002 03:07:33 GMT
Organization: AT&T Worldnet
As I read your post I had a flash back of (adapted) " I knew Ebers-Molls...
and your no Ebers-Molls" famous quote came to mind.
I always liked Gummel-Poone name...
"Kevin Aylward" wrote in message
> Rick wrote:
> > Paul Burridge wrote:
> >> hi,.
> >> Can some kind soul post the E-B equation that describes the behaviour
> >> of BJTs? Also, how accurate is this model and does it contain
> >> everything one needs to know about BJT behaviour in isolation?
> > Ic = Is ( exp(Vbe/Vt) - 1 )
> > Is = saturation current
> > Vbe = base-emitter voltage
> > Vt = thermal voltage = k (Boltzmann const) * T (Kelvin) / q (electron
> > charge)
> > The Ebers-Molls equation is almost completely useless, other than for
> > exploring "how transistors work". There is, for example, just one
> > parameter that defines the device, namely Is. No Ohmic resistances,
> > parasitic capacitances, parasitic diodes or parasitic pnp's are
> > simulated. You need to look at Gummel-Poon, or even Mextram models
> > for decent accuracy.
> This is not the Ebers-Molls equation. This is just the one diode
> equation. Ebers-Moll includes both diodes.
> Kevin Aylward
> SuperSpice, a very affordable Mixed-Mode
> Windows Simulator with Schematic Capture,
> Waveform Display, FFT's and Filter Design.