| Author |
Message |
Gregtlse
Joined: 02 May 2007
Posts: 6
|
 31 May 2007 16:28 mixed mode scc21 |
|
|
|
|
Hello I have a little problem concerning the measurement of differential S parameters for a differential amplifier.
I have to measure the conversions between differential mode and common mode using the mixed mode S parameters concepts (Eisenstadt).
Therefore I designed a differential pair and I used baluns in order to access to Sdd, Sdc, Scd and Scc. But I'm not sure what I'm measuring exactly and I need some help.
The baluns used:
http://images.elektroda.net/91_1180625563.jpg
When I measure S21 and S43, does it correspond to Sdd21 and Scc21? I'm nearly sure it is Sdd21 and Scc 21 but I don't manage to find the signification of the others.
In the list of the S parameters I have S11 S12... S14, S21...S24, ... S44.
Thanks for your response and for your help.
|
|
| Back to top |
|
 |
pravin_dwaramwar
Joined: 06 Dec 2006
Posts: 121
Helped: 3
Location: Nagpur - India
|
01 Jun 2007 8:14 Re: Differential S parameters and mixed mode s parameters. |
|
|
|
|
Dear ,
Plz refer www.rfic.co.uk
Go through the differential LNA Design. refer page 6-7.
I am confident that u will the the answer
|
|
| Back to top |
|
|
Google
AdSense
|
01 Jun 2007 8:14 Ads |
|
|
|
|
|
|
| Back to top |
|
|
Gregtlse
Joined: 02 May 2007
Posts: 6
|
01 Jun 2007 8:38 Re: Differential S parameters and mixed mode s parameters. |
|
|
|
|
Thanks I have already read all the circuits in particular lna design and all the circuits with differential structure. However, the author doesn't use this topology first used by William R. Eisenstadt.
In fact I have just found the answer:
Differential mode
S11=> S11
S12 S12
etc...
common mode
S33, S34, S43, S44 correspond to S11 S12 S21 S22odd
|
|
| Back to top |
|
|
