[sdiy] Odd transistor connection, why???

[ASSI]

On Tuesday 18 May 2010, David Ingebretsen wrote:
> The common link between the ones which don't work is a weird NPN
> transistor connection. Nyle connected the base to the emitter or
> collector and then uses the transistor as a two pin device, like
> this:
> 
> 
>              ______
> 
>           __|__    |
>           /  \     |
>     _____/    >____|_____
> 

That's also a diode, the transistor is just used in reverse.  If the 
SPICE model extraction has been done correctly there should be no 
problem simulating this.  As others have already said, using the diode 
connected transistor in reverse is sometimes done to obtain a low-
leakage diode.


Achim.
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