[SI-LIST] Re: Question on Obtaining Z parameter through VNA
- From: steve weir <weirsi@xxxxxxxxxx>
- To: ivan_zju@xxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 01 Aug 2005 20:48:52 -0700
Ivan, it is just a solution of KVL / KCL. The source and receiver both=20
look like 50 ohms in parallel with the DUT, and 0dB is calibrated for an=20
open DUT.
Steve
At 11:30 AM 8/2/2005 +0800, Ivan Zhang wrote:
>Dear all.
>I got to know this method by chance, however, the author of the paper=20
>doesn't mention how to deduce this formula. Thus, hope someone can
>help me. Thanks in advance.
>
>
> port1 port2
> -----------------------------------------------
> + | +
> |
> Z dut
> |
> _ | _
> -----------------------------------------------
>
>The SMA for port1 is very close to DUT as well as the SMA for port2. Get=20
>the S21 through 2-port s-parameter measurement, then calculate Zdut=20
>according to the formula shows below.
> S21 =3D Zdut/(Zdut + Zo/2)
>Zo is the impedance of VNA, it's 50 ohms in general.
>
>
>
>
>Best Regards
>
>Ivan
>
>
>---------------------------------
>DO YOU YAHOO!?
> =D1=C5=BB=A2=C3=E2=B7=D1G=D3=CA=CF=E4=A3=AD=D6=D0=B9=FA=B5=DA=D2=BB=BE=
=F8=CE=DE=C0=AC=BB=F8=D3=CA=BC=FE=C9=A7=C8=C5=B3=AC=B4=F3=D3=CA=CF=E4
>
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