The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> RF Design >> On chip balun for single ended to diff
https://designers-guide.org/forum/YaBB.pl?num=1368299656

Message started by mixed_signal on May 11^th, 2013, 12:14pm

Title: On chip balun for single ended to diff
Post by mixed_signal on May 11^th, 2013, 12:14pm

Hi,
I am using a balun to convert single ended signal (from signal generator) to differential (onchip).

1. Is it necessary to ground the center tap of secondary? I am AC coupling the differential.

2. Since sig gen has 50 ohm impedance i have put a 50 ohm in parallel with primary.

Title: Re: On chip balun for single ended to diff
Post by raja.cedt on May 12^th, 2013, 3:21am

hello,
1.You could connect center tap to any potential as you are using ac coupling, it doesn't matter what you connect.
2.It depends on your Requirement, are you interested in max power TF or maximum voltage TF. If you are interested in narrow band frequency of operation use a matching network between balun and SG.

Thanks,
Raj.

Title: Re: On chip balun for single ended to diff
Post by mixed_signal on May 12^th, 2013, 2:20pm

Hi,
1. Can I leave the center tap unconnected? Has it any fabrication issues?
The common mode can have any value since it is floating..right?

2. Is it not sufficient to terminate the primary with 50 ohm shunt. I just want my V+ and V- to be +-400mV for testing my subsequent blocks