In order to improve the conversion efficiency and output current carrying capability of the fully integrated low voltage and low power DC/DC converters
a series parallel multi-layer spiral inductor based on standard 0.5 μm 2P3M CMOS technology was proposed. The paralleled metals contacted by vias array increased the effective metal thickness and the series metals increased the mutual inductance between the layers. Therefore
the quality factor
the inductance in unit area and the current handling capability of the series parallel inductors were observably improved without extra technology. The developed model provides whole circuit analog analysis of fully integrated DC/CD converters with convenient basis. Closed form expressions of lumped parameters were obtained and verified with 0.5 μm CMOS silicon technology. Experiment results show that the maximum quality factor is 4.2
the inductance in unit area is 83 nH per square millimeter
and the handled current is 90 mA. The model agrees well with measurements in the interesting frequency band
from 50 MHz to 400 MHz.
关键词
Keywords
references
Musunuri S, Chapman P L, Zou J, et al.Design issues for monolithic DC-DC converters [J]. IEEE Transactions on Power Electronics,2005,20(3): 639-649.
Lee J, Hatcher G, Vandenbergh L, et al.Evaluation of fully-integrated switching regulators for CMOS process technologies [C]∥International Symposium on System-on-Chip. Piscataway, USA: IEEE,2003:155-158.
Erickson R W, Maksimovic D. Fundamentals of power electronics [M]. 2nd ed.Norvell:Kluwer Academic Publishers,2001:15-27.
Li Qinghua, Geng Li, Shao Zhibiao.Optimum double-layer spiral inductor on silicon substrate designed for monolithic buck converters [C]∥Proc of 17th Asia-Pacific Microwave Conference.Piscataway, USA: IEEE, 2005:2156-2159.
Mohan S S, Hershenson M M, Boyd S P, et al.Simple accurate expressions for planar spiral inductances [J].IEEE Journal of Solid-State Circuits,1999,34(10):1419-1424.
Greenhouse H M. Design of planar rectangular microelectronic inductors [J]. IEEE Transactions on Parts, Hybrids, and Packaging, 1974, 10(2):101-109.
Grover F W.Inductance calculations [M].New York:D. Van Nostrand Company, Inc., 1946:31-47.
Long J R,Copeland M A.The modeling,characterization,and design of monolithic inductors for silicon RF IC's [J].IEEE Journal of Solid-State Circuits,1997,32(3):357-369.
Zolfaghari A,Chan A,Razavi B.Stacked inductors and transformers in CMOS technology [J].IEEE Journal of Solid-State Circuits,2001,36(4):620-628.