[SI-LIST] Re: A question for the instrument guys on TDR and TDT
- From: dgun@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 16 Nov 2006 22:10:25 -0800
I can see logic in that argument (well, except for the last statement). If =
you don't need
the dynamic range or the precision calibration, then TDR makes a lot of sen=
se.
--
Daniel
> From: "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx>
>=20
> I can only speak from a system design perspective. The high speed samplin=
g scope is free because=20
> that's basic lab equipment every hardware manager will budget for his lab=
. A VNA is an extra=20
> equipment solely used for channel modelling/testing or the remote possibi=
lity of PD analysis. I=20
> never believe in highspeed PD problem beyond the die and package so I nev=
er can justify a VNA=20
> other than channel measurements. I do have both but I think an impulse re=
sponse on a sampling=20
> scope can satisfies a lot of system designers need for S-parameter measur=
ements. And I believe=20
> that scope company up North is listening :-D (just came back from their s=
eminar, LOL)
> Now if I can use that VNA budget for a Ferrari......
>=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of dgun@xxxxxxxxxx
> Sent: Tuesday, November 14, 2006 4:04 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: A question for the instrument guys on TDR and TDT
>=20
>=20
> Wouldn't a scope fast enough to capture the reflections or transmissions
> of a 35ps pulse be as or more expensive than a low-cost VNA?
>=20
> --
> Daniel
>=20
>=20
> > From: "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx>
> >
> > I can understand the merit of a step response and direct read out of =
=3D3D
> > impedance profile.
> > Will it be easy to also include a mode with a sharp pulse instead of =
=3D3D
> > step for an impulse response ? If you have a circuit to generate a 35ps=
=3D
> =3D3D
> > step, can you use it to generate a 35ps pulse also ? I think there are =
=3D
> =3D3D
> > steps you can do to convert one to the other but a direct impulse =3D3D
> > response is just too good to pass up.
> > Network analyzer on the cheap.
> > Thanks in advanced,
> > Chris
--=20
Search for products and services at:=20
http://search.mail.com
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