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S-parameter formulation of quality factor for a spiral inductor in generalized two-port configuration

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4 Author(s)
Tzyy-Sheng Horng ; Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Taiwan, Taiwan ; Kang-Chun Peng ; Je-Kuan Jau ; Yu-Shun Tsai

This paper formulates various quality (Q) factors associated with the applications of on-chip spiral inductors to radio-frequency integrated circuits using S-parameters. The formulations start with the Q factor of a spiral inductor in a generalized two-port configuration based on a new complex-power approach and then extend to the Q factors of a tank and matching circuits that use the spiral inductors. In the demonstration, the two-port S-parameters for a series of CMOS spiral inductors have been measured to further generate such various Q factors for a many-sided evaluation of the inductor performance.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:51 ,  Issue: 11 )