[Ktechlab-devel] troubles: p type jfet

[Jason Lucas]

On Sun, 2007-06-17 at 22:33 +0200, Chitlesh GOORAH wrote:
> Hello there,
> At gate-source cut off voltage, Vgs(off) (which you call threshold voltage in 
> ktechlab) the drain current,Id should become zero. However it isn't the case.
> 
> see attached: p-type.circuit
> 
> But the n-type jfet simulates its input/output characteristics properly.
> 
> To my guess, in today's svn snapshot, ktechlab allows the _same_ circuit for 
> n-type and p-type jfets (except the sign of the drain current is 
> automatically set,which is good).
> 
> see attached : jfet_characteristics.circuit
> 
> Generally, a p-channel JFET operates in the same manner as an n-channel JFET 
> except that channel current carriers will be holes instead of electrons and 
> the polarities of Vgs and Vds are reversed.
> 
> In my jfet_characteristics.circuit, one can see the polarities of Vgs and Vds 
> are _NOT_reversed for both cases.
> 
> regards,
> Chitlesh

Ah, yet another bug. I'll add it to my list of problems to solve.

Thanks for pointing this out, Chitlesh.

Jason.