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A Method to Improve Linearity of a Variable Operating Range Transconductor
Toshio Miyazawa,Fujihiko Matsumoto,Kazufumi Kanegae,Yasuaki Noguchi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
A transconductor using bias offset technique is known as a linear MOS transconductor. The linearity is deteriorated by nonideal factors. Major deterioration is caused by mobility degradation from an effect of vertical field. This paper proposes a linearization technique of the MOS transconductor following change of operating range. This technique improves the linearity of transconductance characteristic by adding two MOSFETs operating as resistors and a source follower to the conventional circuit.
ORGANIC-METAL-DOPED FULLERENE NANOWHISKERS
TOSHIO SASAKI,KUN'ICHI MIYAZAWA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.5
Two types of ferrocene(Fc)-doped C60 nanowhiskers [C60/Fc NWs and C60/ferrocene pyrrolidine-C60(C60-Fc) NWs] were prepared by the liquid–liquid interfacial precipitation method using toluene solution of C60 and Fc or C60-Fc and isopropyl alcohol (IPA). The morphology of C60 precipitates was remarkably changed by the addition of Fc or C60-Fc to the C60 toluene solution. The scanning TEM mapping analysis of C60/Fc NWs showed that the intensity of ferrocene is high at the edge, indicating that ferrocene covers the outside surface of the NWs. In the case of C60/C60-Fc NWs, however, the scanning TEM mapping analysis showed that C60-Fc disperses well in the NWs.
A Level Shifter for a Bias-Offset Transconductor
Fujihiko Matsumoto,Toshio Miyazawa,Shintaro Nakamura,Yasuaki Noguchi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
A transconductor is a fundamental building block for analog signal processing circuits, such as filters and multipliers. For such applications, the transfer characteristic of the transconductor is desired to be linear. The bias-offset transconductor is known as a linear MOS transconductor. The transconductor has floating voltage sources. This paper presents a new design of the floating voltage source. If the proposed circuit is used as a level shifter for the linear transconductor, the output DC voltage is more accurate than that of the conventional circuit. Further, the proposed circuit is used as the second signal voltage source for a multiplier, the second harmonic distortion is improved. Simulation results show those advantages.
Preparation and Properties of Inorganic-organic Hybrid $Li^+$ Ion Conductor by Sol-gel Process
Nishio, Keishi,Miyazawa, Tsutomu,Watanabe, Yuichi,Tsuchiya, Toshio The Korean Ceramic Society 2001 The Korean journal of ceramics Vol.7 No.1
Inorganic-organic hybrid Li$^+$ ion conductors were prepared by the sol-gel process. Tetramethyl orthosilicate (TMOS), polyethylene glycol 200 (PEG$_200$) and lithium bis (trifluoro-methylsulfony) imide were used as raw materials and $H_2O$ was used as a solvent. Hybrid Li$^+$ ion conductor prepared by the sol-gel process showed very high ion conductivities of log${\sigma}_R.T$(S/cm)=-3.73, log${\sigma}_60$(S/cm)=-3.00 at room temperature and $60^{\circ}C$, respectivery. Decomposition voltage was 3.1 V.
An NIC Voltage Divider for a Linear Transconductor
Fujihiko Matsumoto,Takeshi Sonoda,Toshio Miyazawa,Shintaro Nakamura,Yasuaki Noguchi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
A local feedback linear transconductor requires a voltage divider. For realization of a gyrator-C filter, an output terminal of a transconductor in the filter is connected to an input terminal of itself or another transconductor owing to local feedback of gyrators and equivalent resistors. If NIC circuits are employed in a gyrator-C filter, the voltage divider and the NIC are connected in parallel. This paper proposes a NIC divider that has two roles: one is a voltage divider and the other is an NIC for improvement of the output resistance of a transconductor.