[SI-LIST] Re: passive component .vs. series component
- From: "Dmitriev-Zdorov, Vladimir" <vladimir_dmitriev-zdorov@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 18 Jun 2007 12:33:59 -0700
Hi Guys,
According to the basic definition the elements are connected in series
only if they have the same through current. The elements are connected
in parallel if they have the same across voltage. The word SAME means
that the identity is forced by topology and Kirkhoff laws.
If we have several blocks connected to each other, we should call them
cascaded, not connected in series. For cascaded blocks there are other
simple rules (like ABCD-parameters) we can use to find the cumulative
effect. But this will not be currents of voltages but rather transfer
functions or something else.
Of course there could be passive multiports (e.g. connectors/packages
etc.) that are in no way series elements. Passivity here may be
determined from analyzing eigenvalues of their S/Y or Z parameter
matrices. There can also be series non-passive devices. These typically
demonstrate negative differential impedance (conductance) and frequently
are small signal approximations of nonlinear passive devices. Please
note that diode or transistor by itself is a passive device, for it
cannot generate energy. However, if properly biased by external sources,
it may have negative differential impedance and demonstrate small-signal
non-passivity.
Vladimir
>Msg: #5 in digest
>From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
>Subject: [SI-LIST] Re: passive component .vs. series component
>Date: Mon, 18 Jun 2007 14:17:58 -0400
>> My another point is, do you call pull-up/pull-down registers series
?
>Pull-up/pull-down RESISTORS (not registers, those are something else
>entirely) are not in any way series components with respect to the
signal
>path. At least that's my opinion.
>> Do you call any combinations of component series
>> which connect signal to ground/power net ?
>Possibly. A filter might be in series with the signal path, but have a
>connection to power or ground.
>Even something like a short transmission line inserted in series in a
signal
>path (perhaps used as an impedance matching or tuning device) has
connections to ground.
>Andy
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