RF transformer and IF transformer


Joined Feb 24, 2006
They are transformers. They are characterized to work at higher frequencies than power transformers. They are used for coupling and impedance matching.


Joined Apr 2, 2007
wiki describes rf transformer as

"For radio frequency use, transformers are sometimes made from configurations of transmission line, sometimes bifilar or coaxial cable, wound around ferrite or other types of core. This style of transformer gives an extremely wide bandwidth but only a limited number of ratios (such as 1:9, 1:4 or 1:2) can be achieved with this technique.

The core material increases the inductance dramatically, thereby raising its Q factor. The cores of such transformers help improve performance at the lower frequency end of the band. RF transformers sometimes used a third coil (called a tickler winding) to inject feedback into an earlier (detector) stage in antique regenerative radio receivers."


Joined Jan 10, 2006
And an IF transformer is just an RF transformer tuned to the IF frequency... ie 10.7 MHz, or 455KHz or whatever happens to be used.


Joined Jan 22, 2004
and i might add wide band rf trannys application are for matching impedance, voltage/current transformation, dc isolation, power splitting, signal inversion, likewise balance/unbalanced mixing.
there's this custom wide band trannys that has special combination of impedance ratio, also frequency response, just to mention a few.

you should also check the very informative tutorial in this site.