# RE: [SI-LIST] : RE: Split Plane

From: Larry Miller ([email protected])
Date: Fri May 26 2000 - 06:56:39 PDT

Dr Johnson's derivation is given in an Appendix in his book. However, this
is not the BW frequency. It is the upper frequency that you have to pass to
satisfactorily handle the corresponding edge rate. Basically, it is the
frequency at which you can have a brick wall lowpass filter without
seriously impacting pulse shape.

Larry Miller

> -----Original Message-----
> From: Doug McKean [SMTP:[email protected]]
> Sent: Thursday, May 25, 2000 3:36 PM
> To: [email protected]
> Subject: Re: [SI-LIST] : RE: Split Plane
>
> Hi Barry,
>
> I've seen the derivation for the BW = 0.35/tr(10% - 90%).
>
> I haven't seen the derivation for the BW = 0.5/tr
>
> - Doug
>
> Barry Ma wrote:
> >
> > Hi,
> >
> > There is another way to figure out what is the highest frequency we
> might need to take care of:
> >
> > Howard Johnson call it Fknee = 0.5/Tr. Given Tr = 0.4 ns, We have Fknee
> = 1.25 GHz.
>
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