The variation of phase imbalance of an RF transformer at x frequency

RF Transformer

I'm working on experiments with RF transformer (minicircuits ADT1-1).
Is there any body who knows about the variation of phase imbalance of any RF transformer @any frequency?

The datasheet of RF transformer says their phase imbalances at multiple frequencies. But they don't open the variation of the phase imbalance.
I need any example of the variation. Please help.

Re: RF Transformer

Obviously the parameter isn't specified more exactly. If it's matters in your application, you have to measure it yourself.
For a general consideration, you may want start with the equivalent circuit of a center tapped transformer (including parasitic
elements) and calculate, how imbalance is brought up.

Mini-Circuits has an application note "How RF Transformers Work", that can help you in understanding the fundamentals.
Generally I would expect imbalance to increase at the transformer frequency limits, particluarly the upper.

Re: RF Transformer

I fully agree with FvM. Thanks alot.

I have a single RF transformer, and when I measured the phase imbalance @ 100MHz, it was around 1.5deg. Then I measured phase imbalance a couple of times, but I think there was high variation from 1.5deg.
Unfortuately I don't any other RF transformer to be compared with it.

So I just want to know generally how much the VARIATION of phase imbalance (NOT the mean value of phase imbalance) is. I need the value of degree for the variation.
Any one knows about the variation of phase imbalance? I need a variation at any freq, even though I'm meausring it at 100MHz.

Re: RF Transformer

I need a variation at any freq

Click to expand...

Yes, but they don't tell it.

Re: RF Transformer

**broken link removed**

Re: RF Transformer

biff44, Thanks for the link.
But I still couldn't find variation of phase imbalance even on that link.
I could find typical and max value of phase imbalance on table3 of page2.
But it indicates values which were measured on many of transformers.

I need the standard deviation on phase imbalance, when we measure it on the same transformer, something like repeatablility. Any body knows that?

Re: RF Transformer

A few years ago I emailed a few cycles with the Minicircuits people. Their transformers are transmission line types and not the traditional primary and secondary windings type that are used in power and audio transformrs.

I would expect with such small phase numbers that you give, the manufacturing variations would vary within this "band" of values.

If you need very small values, I suspect that you will have to do production line tweaks such as putting a very small capacitor to ground at points in your circuit. Or design at the system level to accommodate such variations.

Re: RF Transformer

You could ask a similar question about nearly any parameter of electronical devices, that is not exactly specified by the
manufacturer. What answers do you expect?

It's practically impossible to specify any parameter exactly. If they do, they possibly have to measure it in production.
You'll notice however datasheet comments, that many parameters are given "by design" rather than actually measured. If
you are a practical man, you'll also know, that datasheet specification are not certainly correct. So again, what are you
actually asking for?

If the said imbalance parameter matters in your application, you should do at least this:
- determine the real variation for a number of samples
- try to understand the physical reasons causing this variation
- try to get inofficial statements from the manufacturer regarding expected variation
- as suggested by flatulent, plan means to correct larger variations (at least up to the specified limits), that may occur later in
production, hoping they won't be ever needed

Re: RF Transformer

have any bod made a layout or RF transformer or Balun (on chip) ???

please guide me

Re: RF Transformer

shashikumar.22 said:

have any bod made a layout or RF transformer or Balun (on chip) ???

please guide me

Click to expand...

I have done many transformers and baluns on silicon...
How can I guide you ??? Please read some documents,papers,books,app.notes before directly asking your questions.
The best learning method starts with some reading.. Doesn't it ??,
There are tons of docs. on internet...