Multiple Turn Ratios of On-Chip Transformer With Four Intertwining Coils

作者：Hsu Heng Ming^*; Chien Chun Tsai

来源：IEEE Transactions on Electron Devices, 2014, 61(1): 44-47.

DOI：10.1109/TED.2013.2292855

• 90-nm CMOS technology
• four coupling coils
• inductance density
• on-chip transformer

This paper develops an on-chip transformer in which four coils are entwined tightly within a limited area. The proposed device has a total of six possible turn ratios. The flexibility of the turn ratio facilitates the convenient merging of two transformers with the RF design in a device area. To demonstrate the proposed device, seven devices are fabricated using 90-nm CMOS technology. Measurements reveal that one device has a wide range of turn ratios (n = 1-5.8) and coupling coefficients (k = 0.61-0.95) within an area of 0.01 mm(2). A coil of one of the devices has an inductance of 28.4 nH and conducts with an inductance density of 2840 nH/mm(2).

• 出版日期2014-1