Simulate odd mode/even mode impedance using 4 port S/Z/ABCD parameters

Status
Not open for further replies.
V

vlsi_design2

Member level 1
Joined
Nov 30, 2014
Messages
41
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
1,610
Hi, I am designing a coupled line coupler and I want to simulate Zoe and Zoo vs freq. How can I express using S or Z or ABCD parameters?
 

Sort by date Sort by votes
Can I use an ideal balun and reduce it to a two port problem and do s param -> ABCD pram and the use sqrt(B/C) to find Zoo. Can I use center tap of the balun to evaluate Zoe?
 

Upvote 0 Downvote
vlsi_design2 said:
Can I use an ideal balun and reduce it to a two port problem and do s param -> ABCD pram and the use sqrt(B/C) to find Zoo. Can I use center tap of the balun to evaluate Zoe?
Click to expand...
It looks correct to me. If you excite the line differentially (two lines excited at 180 degree out of phase), the impedance you observe will be the odd mode impedance. Similarly, if you excite the lines in even mode (two lines excited with the same phase with respect to a third node called common node), that is, you apply the same sinusoid to the both lines, you will observe the even mode impedance.
From ABCD parameters, you can calculate the impedance as you stated.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…