[SI-LIST] Re: Spiral Inductor

Hi I can provide you with some tips for inductor design at this frequency ..may 
be they will help1.single loop inductors can provide large L and Q..The design 
formula are given in "microwave solid state circuit design" by "Bahl and 
Bhartia".2.the resonant frequency of the inductor is given by   Fres = 1/( 2* 
pi * sqrt(L * C/2 )) So you have to have a low capacitance to increase your 
resonant frequency.3.To estimate the inductors unloaded Q ,series resistance 
must be added to the equivalent model...(ref again Bahl and Bhartia)4.Spiral 
inductors provide the largest inductance but then there is the interwinding 
capacitance .You can use the the spiral inductors with entire air bridges in it 
(less interwinding capacitance) I.D.Robertson discusses these models.5.For a 
given outer diameter Q(circular spiral ) >Q (square spiral),so use spiral 
inductors6.Multiturn inductors have higher Q but lower Fres due to interwinding 
capacitance , so use lesser number of turns. Hope this is of some help to 
you.ThanksAtif


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