Design and simulation of novel planar Micro-transformer with high quality factor

Subject Areas : Majlesi Journal of Telecommunication Devices

Bahram  Azizollah Ganji ¹ (Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology,)
Mohammad  Molanzadeh ² (Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology,)

Received: 2016-01-23 Accepted : 2016-02-13 Published : 2016-03-01

Keywords: en,

Abstract :

In this paper a novel planar micro-transformer with high quality factor is presented. Non-uniform current density distribution, especially in inner turn, increases the effective metal resistance due to skin and proximity effect .In order to overcome this problem, a novel crossover connection between turns to equal the distance current path across the turns and uniform the current distribution, has been used. With diminished current crowding effects, the effective resistance is minimized, thereby increasing the performance-parameter values. Simulation has been taken by using ADS Momentum and HFSS software. The quality factor, self-inductance, mutual inductance and coupling factor at 3.5 GHz frequency are achieved about 42.6, 4.9 nH, 3.3 nH, 0.747 respectively, and occupied structure space is 860 um×860 um. Because of the structure is symmetric, the primary and secondary characteristic is same .compare to conventional micro-transformer 17% in quality factor,5% in coupling coefficient and more than 20% in self and mutual inductance, improvement are achieved.   

References:

[1] Niknejad, Ali M., and Robert G. Meyer. Design, simulation and applications of inductors and transformers for Si RF ICs. Boston: Kluwer Academic Publishers, 2000.

[2] Ren, Zhixiong, et al. "On-chip transformer using multipath technique with arithmetic-progression step sub-path width." Electron Devices and Solid-State Circuits (EDSSC), 2015 IEEE International Conference on. IEEE, 2015.

[3] Huang, I-Yu, Wen-Hui Huang, and Chian-Hao Sun. "Development of suspended planar two port micro transformer for RF wireless application." SENSORS, 2013 IEEE. IEEE, 2013.

[4] Hsu, Heng-Ming, and Chun-Tsai Chien. "Multiple Turn Ratios of On-Chip Transformer With Four Intertwining Coils." Electron Devices, IEEE Transactions on 61.1 (2014): 44-47.

[5] Lin, Yo-Sheng, et al. "A high quality factor and low power loss micromachined RF bifilar transformer for UWB RFIC applications." Electron Device Letters, IEEE 27.8 (2006): 684-687.

[6] Chong, Kyuchul, and Ya-Hong Xie. "High-performance on-chip transformers." Electron Device Letters, IEEE 26.8 (2005): 557-559.

[7] Lin, Yo-Sheng, et al. "High-performance on-chip transformers with partial polysilicon patterned ground shields (PGS)." Electron Devices, IEEE Transactions on 54.1 (2007): 157-160.

[8] Yunas, Jumril, Azrul Azlan Hamzah, and Burhanuddin Yeop Majlis. "Surface micromachined on-chip transformer fabricated on glass substrate." Microsystem Technologies 15.4 (2009): 547-552.

[9] Yunas, Jumril, and Burhanuddin Yeop Majlis. "Comparative study of stack interwinding micro-transformers on silicon monolithic." Microelectronics Journal 39.12 (2008): 1564-1567.

[10] Mohan, Sunderarajan S., et al. "Simple accurate expressions for planar spiral inductances." Solid-State Circuits, IEEE Journal of 34.10 (1999): 1419-1424.

[11] Rapolu, Kavitha. Broadband modeling of on-chip transformers for silicon RFICs. Diss. 2008.

[12] Yue, C. Patrick, and S. Simon Wong. "On-chip spiral inductors with patterned ground shields for Si-based RF ICs." Solid-State Circuits, IEEE Journal of 33.5 (1998): 743-752.

[13] Ng, Kiat T., Behzad Rejaei, and Joachim N. Burghartz. "Substrate effects in monolithic RF transformers on silicon." Microwave Theory and Techniques, IEEE Transactions on 50.1 (2002): 377-383.

[14] Vanukuru, Venkata Narayana Rao, and Anjan Chakravorty. "High-Q Characteristics of Variable Width Inductors With Reverse Excitation." Electron Devices, IEEE Transactions on 61.9 (2014): 3350-3354.

[15] Kuhn, William B., and Noureddin M. Ibrahim. "Analysis of current crowding effects in multiturn spiral inductors." Microwave Theory and Techniques, IEEE Transactions on 49.1 (2001): 31-38.