A New Fractal-Based Design of Stacked Integrated Transformers

Table 1

The performance comparison of different transformer realizations.

Ref.	Configuration	Lp [nH]	Qp	SRF [GHz]
[11]	Differential square spiral transformer	0.8	5.2 peak @ 5 GHz	10
[12]	Interleaved 3 turn square spiral transformer	5.32	5.77 peak @ 2.95 GHz	6.2
[13]	Interleaved square spiral transformer	8.5	NA	4.9
[14]	Differential square spiral transformer	5.5	10 peak @ 1.7 GHz	NA
This work	Stacked transformer, Hilbert 𝑁=3, 𝑤=10𝜇m	0.6	5.95 peak @ 8.4 GHz	18.8