[SI-LIST] Re: Loss Tangent

I recommend a basic 'googling' before posting a querry.

Here is one Google search result.

http://www.dilabs.com/about/faqs.aspx

What is loss tangent?
Loss tangent, a synonym for dissipation factor, is a quantification of loss 
in the capacitor.  The loss tangent is the tangent of the phase angle 
relationship between capacitor voltage and capacitor current as the angle 
departs from the theoretical 90 degree value as a result of loss mechanisms 
within the capacitor.
d is also known as the loss angle.

tan d = DF = 1/Q  = ESR/ Xc

What is dissipation factor?
Dissipation factor, a synonym for loss tangent, is a quantification of the 
loss in the capacitor.  Mathematically it is equal to the reciprocal of Q 
and, generally, is expressed as a %.

DF = 1/Q = (ESR/ Xc) x 100
For a loss angle of 2 degrees, tan d = 0.035, and expressed as a percent DF 
= 3.5%.  Thus 3.5 % of the power in the capacitor will be lost as heat.

Regards
Joe

----- Original Message ----- 
From: "JayaSimha D" <si.pcb.dx.pads@xxxxxxxxx>
To: <jain.nitin@xxxxxxxxx>
Cc: <si-list@xxxxxxxxxxxxx>
Sent: Monday, May 29, 2006 6:47 PM
Subject: [SI-LIST] Re: Loss Tangent


> Thanks Nitin, Is there a principle behind it?
> Regards,
> Jaya
>
>
> On 5/29/06, jain.nitin@xxxxxxxxx <jain.nitin@xxxxxxxxx> wrote:
>>
>> Loss tangent is parameter which defines dielectric loss w.r.t frequency
>> of signal. Attenuation of signal due to dielectric loss is directly
>> proportional to frequency and loss tangent.
>>
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>> On Behalf Of JayaSimha D
>> Sent: Monday, May 29, 2006 5:59 PM
>> To: SI-List
>> Subject: [SI-LIST] Loss Tangent
>>
>> Gi Guys,
>> I am new to SI. I am having one doubt that is loss tangent ? what is it
>> actually and what are adverse effects of it on the signals.
>>
>> I hope i will get some replys.
>>
>> Regards,
>> Jaya
>>
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