Bessel Poles

Hello,

Just out of curiosity:

I there actually a simple formula to determine the pole locations of a
n-th Order Bessel Lowpass? In literature I've only seen tables which
were obviously created by finding the complex roots of the Bessel
polynomials...

Thanks!
Kind Regards,
Joerg

N

On Monday, December 10, 2012 7:07:43 PM UTC-5, Joerg Weissflog wrote:
> Hello,
> 
> 
> 
> Just out of curiosity:
> 
> 
> 
> I there actually a simple formula to determine the pole locations of a
> 
> n-th Order Bessel Lowpass? In literature I've only seen tables which
> 
> were obviously created by finding the complex roots of the Bessel
> 
> polynomials...
> 
> 
> 
> Thanks!
> 
> Kind Regards,
> 
> Joerg

Not a simple formula, but you can have a simple formula to approximate the roots which then may be polished by Newton's iteration.

Clay