>
>
>>Jim Thomps>>
>>
>>>>>>
>>>
>>>
>>>>Jim Thomps>>>>
>>>>
>>>>>>>>>>
>>>>>
>>>>>
>>>>>>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