Hi,

I want to design an onchip 1:5 balun. Can anyone suggest me books or IEEE papers?

You can use 3:4 turn ratio, with 3 parallel and 4 series.

Too large turn ratio will decrease the coupling coefficient k.

In my opinion, the best on-chip transformer paper is
<Monolithic Transformers for Silicon RF IC Design> by J. R. Long, Vol 35, No. 9, JSSC 2000

vlsi_design wrote on Jan 14^th, 2015, 7:30pm:

Designing a 1:5 balun with a good coupling coupling coefficient is very tough. Ultimately, it boils down to the trade-off between circuit area and coupling coefficient k.
Care to provide the details of the inductance of the windings that you are willing to target, that might help me in pointing you in the right direction??
For good understanding of on-chip balun, you can read the following links

http://marco.stanford.edu/swong/Haitao.pdf
http://smirc.stanford.edu/papers/IEDM98s-mohan.pdf