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SPICE simulation of finite Q inductors
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Thu Jul 20, 2006 7:30 pm    Post subject: Re: SPICE simulation of finite Q inductors Reply with quote

Jim Thompson wrote:
Quote:

On Thu, 20 Jul 2006 10:07:14 -0700, Charlie Edmondson
edmondson@ieee.org> wrote:

Well, you might as well just accept them, and hope your plants grow
faster than they can eat them... 8-)

Charlie

I don't think they eat cactus or mesquite ?:-)

If they do, I'll just get out the shotgun ;-)

Jim Thompson


If they eat cacti, ship them to Lake County Florida. There is enough
there to feed millions of the willey wabbits down there. :(


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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Charlie Edmondson
electronics forum Guru Wannabe


Joined: 02 May 2005
Posts: 251

PostPosted: Thu Jul 20, 2006 8:21 pm    Post subject: Re: SPICE simulation of finite Q inductors Reply with quote

Jim Thompson wrote:

Quote:
On Thu, 20 Jul 2006 10:07:14 -0700, Charlie Edmondson
edmondson@ieee.org> wrote:


Jim Thompson wrote:


On Tue, 18 Jul 2006 22:50:13 GMT, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:



Jim Thompson wrote:


On 18 Jul 2006 10:00:53 -0700, "Mark" <makolber@yahoo.com> wrote:



Joel Kolstad wrote:


Those of you who simulate things like passive LC filters... when you want a
simulation that includes the finite Q effect of the inductor, do you tend to
use a model that computes the equivalent parallel resistance, Rloss, based on
the Q specified on a data sheet at a given frequency (and then use that at
*all* frequencies of your simulation, effectively creating Q(freq) )? Or do
you simply specify Q and then use that at all frequencies (creating
Rloss(freq) )?



In most cases, the Q is important only near the resonant frequency. I
use a single fixed value resistor in series with the L that sets the Q
at the frequency corresponding to the circuit resonance frequency.

Mark

In critical applications I'm inclined to use a multi-lump model to
make sure I catch any "squirrels" ;-)

...Jim Thompson


Too bad you can't make that work on Usenet. We're overrun with
squirrels. :(


I've suddenly acquired jack rabbits in my front yard. Can't figure
out where they're nesting.

...Jim Thompson

Well, you might as well just accept them, and hope your plants grow
faster than they can eat them... 8-)

Charlie


I don't think they eat cactus or mesquite ?:-)

If they do, I'll just get out the shotgun ;-)

...Jim Thompson
Young mesquite, probably. Cacti, they usually use to cover their

burrows. The problems are if you have any flowers or food plants
growning. In Borrego, we had several families, but there was only one of
the plants that they liked so well that it couldn't grow. But, once we
planted some marigolds. Lasted two days...

Charlie
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