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IEICE TRANSACTIONS on Fundamentals

Modeling and Layout Optimization of MOM Capacitor for High-Frequency Applications

Yuka ITANO, Taishi KITANO, Yuta SAKAMOTO, Kiyotaka KOMOKU, Takayuki MORISHITA, Nobuyuki ITOH

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Summary :

In this work, the metal-oxide-metal (MOM) capacitor in the scaled CMOS process has been modeled at high frequencies using an EM simulator, and its layout has been optimized. The modeled parasitic resistance consists of four components, and the modeled parasitic inductance consists of the comb inductance and many mutual inductances. Each component of the parasitic resistance and inductance show different degrees of dependence on the finger length and on the number of fingers. The substrate network parameters also have optimum points. As such, the geometric dependence of the characteristics of the MOM capacitor is investigated and the optimum layout in the constant-capacitance case is proposed by calculating the results of the model. The proposed MOM capacitor structures for 50fF at f =60GHz are L =5μm with M =3, and, L =2μm with M =5 and that for 100fF at f =30GHz are L =9μm with M =3, and L =4μm with M =5. The target process is 65-nm CMOS.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E101-A No.2 pp.441-446
Publication Date
2018/02/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E101.A.441
Type of Manuscript
Special Section LETTER (Special Section on Analog Circuit Techniques and Related Topics)
Category

Authors

Yuka ITANO
  Okayama Prefectural University
Taishi KITANO
  Okayama Prefectural University
Yuta SAKAMOTO
  Okayama Prefectural University
Kiyotaka KOMOKU
  Okayama Prefectural University
Takayuki MORISHITA
  Okayama Prefectural University
Nobuyuki ITOH
  Okayama Prefectural University

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