Variable RF Inductor on Si CMOS Chip

Gomi, S.; Yokoyama, Yoshihiro; Sugawara, Hirotaka; Ito, Hiroyuki; Okada, Kei; Hoshino, H.; Onodera, Hidetoshi; Masu, Kazuya

doi:10.7567/ssdm.2003.g-6-4

Cited by 6 publications

(5 citation statements)

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“…Here, the variable MEMS inductors are explained [9,10,11,12]. The variable inductor consists of a conventional planar spiral inductor, a metal plate and a MEMS actuator.…”

Section: V P Cmentioning

confidence: 99%

“…However, they have large series resistance caused by the onresistance in transistor channel, so it is difficult to achieve highquality RF circuit. Recently, the variable capacitor and inductor using MEMS technology are proposed [8,9,10,11,12], which practically achieve wide-range and high-quality characteristics. They have high potential for the reconfigurable RF circuit design, while the manufacturing cost is not low at present time.…”

Section: V P Cmentioning

confidence: 99%

“…Two types of MEMS actuator can be used. One uses horizontal movement [9,10,11], which is realized by a comb-type MEMS actuator [13]. The other uses vertical movement of metal plate [12], which is realized by a parallel-plate actuator [14].…”

Section: V P Cmentioning

confidence: 99%

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A dynamic reconfigurable RF circuit architecture

Okada

Yoshihara

Sugawara

et al. 2005

Proceedings of the 2005 Conference on Asia South Pacific Design Automation - ASP-DAC '05

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This paper proposes a dynamic reconfigurable architecture for analog RF circuits. The architecture consists of RF circuits and a control circuit. The RF circuits can be reconfigured by bias voltages of transistors and variable passive components, and the RF circuit block can also be switched dynamically. The proposed architecture can realize the multi-band/mode RF circuit in single chip for the Software Defined Radio, which achieves considerable reduction of circuit area and power consumption. On the other hand, we can obtain robust RF circuits by the dynamic reconfiguration for the process variation, the dynamic change of temperature, etc. I. IDigital circuits can achieve high performance according to the miniaturization of process technology. However, analog RF circuit design becomes difficult because of low supply voltage, design margin for device variations and operating temperature, etc. On the other hand, recent analog RF circuit requires more integration and multi-band/mode function by the development of radio communication technology [1, 2]. While single chip circuit can achieve high performance, miniaturization and low cost, the analog circuit design becomes more difficult. Furthermore, RF circuit performance is degraded by process variation, temperature at the runtime, simulation error, etc, which also contributes to make the RF circuit design difficult. It is an indispensable technology to reduce the design cost of RF circuits.For such a complicated analog RF circuit design, we propose reconfigurable RF circuit architecture [3]. The architecture can improve yield and design manufacturability of RF circuits by the corroboration of analog and digital circuits. The circuit performance can be dynamically controlled at the runtime by operating the bias voltages of transistors, variable devices and reconfigurable switches. For example, Fig.

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“…Here, the variable MEMS inductors are explained [9,10,11,12]. The variable inductor consists of a conventional planar spiral inductor, a metal plate and a MEMS actuator.…”

Section: V P Cmentioning

confidence: 99%

Section: V P Cmentioning

confidence: 99%

See 1 more Smart Citation

A dynamic reconfigurable RF circuit architecture

Okada

Yoshihara

Sugawara

et al. 2005

Proceedings of the 2005 Conference on Asia South Pacific Design Automation - ASP-DAC '05

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“…We have previously proposed a variable inductor [4,5]. That was assumed to have a comb-type MEMS actuator, which provides horizontal movement [6].…”

Section: Principle Of Variable Inductormentioning

confidence: 99%

Inductance-Tuned LC-VCO for Reconfigurable RF Circuit Design

Yoshihara

Sugawara

Ito

et al. 2004

IEICE Electron. Express

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“…However, in the case of on-chip inductors, several papers on proposals for variable inductors have been reported, and we have proposed on-chip variable inductors. [1][2][3][4][5] The variable inductor is a key passive component for realizing multi band RF circuits. 6) In this work, we propose a novel and simple structure for an onchip variable inductor to expand the variable ratio of inductance, and we achieve a variable ratio 13% larger than those of conventional variable inductors.…”

Section: Introductionmentioning

confidence: 99%