[SI-LIST] Re: A question for the instrument guys on TDR and TDT
- From: "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx>
- To: <istvan.novak@xxxxxxx>
- Date: Mon, 6 Nov 2006 19:25:03 -0800
I would agree. However, the question is not whether the scope is capable =
of doing it but why not ? The controls are almost there (for the =
TDR/TDT) and de-embedding is a simple step of shifting the reference =
plane or simple post processing FIR filter (something advance sampling =
scope can already do). A $40K+ VNA vs. a free firmware upgrade on the =
sample scope. Which one will you choose !?
-----Original Message-----
From: Istvan Novak [mailto:istvan.novak@xxxxxxxxxxx]
Sent: Monday, November 06, 2006 5:31 PM
To: Chris Cheng
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] A question for the instrument guys on TDR and TDT
Chris,
The answer is yes (as long as the network is 'sufficiently' linear). =20
The finite rise time
shows up as filtering, what happens in all simulations or measurements=20
anyway,
even if we neglect the effect of risetime. If you need the impedance of =
a power
distribution network, the quantization of the receiving instrument will=20
set the noise floor.
Regards,
Istvan Novak
SUN Microsystems
Chris Cheng wrote:
>I can understand the merit of a step response and direct read out of =
=3D
>impedance profile.
>Will it be easy to also include a mode with a sharp pulse instead of =
=3D
>step for an impulse response ? If you have a circuit to generate a 35ps =
=3D
>step, can you use it to generate a 35ps pulse also ? I think there are =
=3D
>steps you can do to convert one to the other but a direct impulse =3D
>response is just too good to pass up.
>Network analyzer on the cheap.
>Thanks in advanced,
>Chris
>
>
> =20
>
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