By KCL at node- ,. Therefore the characteristic impedance of the LC-balun is given by. Ouput Voltage From Figure 2, voltage at terminal of load w. From Figure 2, voltage at terminal of load w.
From Eq. The signals will be out-of-phase only under the condition. If conversion is required over a frequency band around operating frequency it further degrades.
Therefore the circuit has very limited bandwidth. Follow the steps below to design a discrete LC balun 1 Since it is a narrow band transformation, know your operating frequency 2 Find the impedance of reactive elements using the equation 3 Compute the values of inductor and capacitor.
Example below shows how to calculate the values of L and C for a discrete balun to use as 50 to single ended to differential converter at MHz operating frequency. This site uses Akismet to reduce spam. Asked 8 years, 3 months ago. Active 8 years, 3 months ago. Viewed 2k times. Now, being all new to RF design and EE not being my trade , I have a couple of questions: What are the principal advantages of using a balun for this conversion instead of going the simple way of just tying one side to ground?
How relevant are these for my application in the low hundreds of megahertz? Add a comment. Active Oldest Votes. Yes, I'll certainly run into issues, and I am also going to consult an experienced engineer, but right now I'm trying to get as far as I can on my own and pick up parts of the needed theory on the way ah, the benefits of youth.
I know that MHz is quite a high frequency, but if you look at the data sheet for the AD, they actually seem to use single-ended inputs without further conversion in some of their examples. There would be no DC component on the input signal AC coupled, referenced to ground.
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