[AMPS] More amplifier experiments

Geurts, Gerard ggeurts@amp.com
Fri, 29 May 1998 16:07:22 +0100

	Jon wrote.

> I would say if 60 nH is accurate, that could have quite an effect on
> the 
> overall supressor design.  The reason is that the supressor coil
> itself 
> is in the 60 to 100 nH range.  So in effect you have 2 inductors
> paralled 
> which (for 2 60 nH Ls in parallel with no resistance in either L)
> would 
> give a total inductance of only 30 nH. 
This 60 nH is the series-inductance (Ls) of the resistor, not the
parallel-inductance (Lp). You need to calculate the (frequency
dependent) parallel equivalent first before you start paralleling the
two inductors. 

>  Yes, there's resistance in the 
> second one (which makes the combination I just did invalid) so you
> can't 
> do a true parallel combination without doing some parallel/series 
> conversions, but having an indcutance in the resistor as large as the 
> supressor inductor would IMHO, make a big difference.
Yes, you can do a 'true parallel combination' on any parallel
combination, but it has to be a parallel combination to start with. Get
your circuit analysis basics right and everything falls in place. 

Gerard, MoAIU

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