Re: [Qucs-help] Define a N or P Channel Mosfet

[Sebastien L. <seb...@lo...>]

Hi,

all these parameters exist and are real. However all datasheets are not giving
them because they are only relevant in specific application, e.g. (very) high
frequencies and/or currents.

Rd, Rs and Rg are the resistance for the *connections*, from the outside of the
package to the silicon chip. This is different from RdsON, which is the JUNCTION
resistance (between source and drain) when the FET is on.

The same goes for Ld,Ls and Lg, which are the *connection* inductance from case
to chip.

However I think this parameters will be quite small, like some fractions of
nanohenrys and milliohms, so you can set them to zero if you're not going to
high frequencies (tenths of MHz) or currents (tenths or hundreds of amperes).

so QUCS is already "uniform with already used definitions", it's just more
universal and complete than standard component datasheets :-)

Regards,

Sebastien

PS: of course you also have capacitances between all these elements :-)

In the high frequency domain, any single piece of wire is an inductor and any
two conductors that are close together are a capacitor :) So you have them
everywhere. For example, a toroidal inductor has different properties when the
wires are wound close together or spread aroud the whole core. The latter has
less capacitance!

Le 29/09/2011 04:04, Ronald RiemVis a écrit :
> Hello,
>
> As simple user I try to use your program and like use to design a balance
> Mosfet output stage .
> I found a few parameters I would like to talk about
>
> In the Properties window from a N-Mosfet diferent lines are there for Rd,
> Rg, Rs
> As far I know only R d-s is excisting
>
> Also many parameters I can find back on the datasheets from manufacturers.
> And a few parameters I can't find in the properties like Internal Drain
> Inductance and Internal Source Inductance
>
> I would like to suggest to make things more clear using the datasheet
> parameters and I know not all are complete.
> In any case try to get more uniform with already used definitions.
>
> Greetings,
>
> Ronald
> ------------------------------------------------------------------------------
> All the data continuously generated in your IT infrastructure contains a
> definitive record of customers, application performance, security
> threats, fraudulent activity and more. Splunk takes this data and makes
> sense of it. Business sense. IT sense. Common sense.
> http://p.sf.net/sfu/splunk-d2dcopy1
> _______________________________________________
> Qucs-help mailing list
> Quc...@li...
> https://lists.sourceforge.net/lists/listinfo/qucs-help