• Transactions on Electrical and Electronic Materials
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• v.12 no.1
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• pp.7-10
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• 2011

High voltage (HV) integrated circuits are viable alternatives to discrete circuits in a wide variety of applications. A HV device generally used in these circuits is a lateral double diffused metal oxide semiconductor (LDMOS) transistor. Attempts to model LDMOS devices are complicated by the existence of the lightly doped drain and by the extension of the poly-silicon and the gate oxide. Several physically based investigations of the bias-dependent drift resistance of HV devices have been conducted, but a complete physical model has not been reported. We propose a new technique to model HV devices using both the BSIM3 SPICE model and a bias dependent resistor model (sub-circuit macro model).

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.3019-3021
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• 2005

In this paper we suggest a novel temperature detection method utilized in direct over-temperature protection circuit modeling. The suggested model detects temperature variation using Rds(on) characteristics of MOSFET, while the conventional methods are using extra devices such as a temperature sensor or an over-temperature detection transistor. The temperature-dependant MOSFET model is implemented using Spice ABM(Spice Analog Behavior Model). The direct over-temperature protection circuit was designed including it. We verified effectiveness of the temperature dependant Rds(on) model characteristics and performance of the direct over-temperature protection circuit on PSpice simulation

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.545-546
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• 2006

The improved model that external capacitances are connected to a conventional BSIM3v3 RF Macro model with Rg and Rsub is developed in this paper. The extracted external capacitances and resistances are modeled by scalable fitting equations. The modeled S-parameters of $0.13{\mu}m$ NMOSFET agree well with measured ones from 10MHz to 10GHz, verifying the accuracy of the improved model.

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.222-225
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• 1999

Started upon it discovery by Wright et al in 1973, studies on the solid polymer electrolyte are being carried out vigorously. So, models of Li-polymer battery have been developed through R-L-C components combination and P-spice functional block in this paper. The impedance characteristics of Li-polymer battery with R-L-C components are presented. Simulation results using P-spice functional model are compared with measured charge/discharge characteristics.

• The KIPS Transactions:PartD
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• v.12D no.4 s.100
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• pp.601-608
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• 2005

It is very important to improve qualify, cost and the necessary period for production in software development project. In order to improve software quality, cost and period, final product as well as a project planning and process itself are concerned. In CMMI of SEI and ISO/IEC 15504 (SPICE), the process for the project management is specified. Recently, as a method of total management - including man power, budget, and schedule - PMBOK is introduced. The detailed and specific management method in PMBOK results in multiple experiments that apply PMBOK to enterprise environment. In this paper, hybrid method of CMMI and PMBOK is proposed to obey CMMI, at the same time, to apply the detailed and specific management method in PMBOK and develop metrics for the method.

• Journal of Sensor Science and Technology
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• v.10 no.2
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• pp.142-147
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• 2001

Using transmission-line equivalent circuit based on cross-field model for an interdigital acoustic wave transducer, an efficient simulation technique of SAW filters by SPICE is proposed. Propagation of surface acoustic wave is modeled as transmission line so that frequency-dependent circuit elements are not needed in the equivalent circuit of an interdigital transducer. Because the equivalent circuits for frequency-dependent circuit elements are not derived approximately, and a small number of circuit elements are used in the equivalent circuit for filters, simulation time is much reduced. The utility of the proposed technique is demonstrated through simulation for the characteristics of SAW filters such as insertion loss, input admittance, passband ripple, and harmonic frequency response.

• Proceedings of the IEEK Conference
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• 2000.06b
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• pp.111-114
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• 2000

Single Electron Transistor Logic (SETL) can be characterized by HSPICE simulation using a SPICE macro model. First, One unit SET is characterized by Monte-carlo simulation and then we fit SPICE macro-modeling equations to its characteristics. Second, using this unit SET, we simulate the transient characteristics of two-input NAND gate in both the static and dynamic logic schemes. The dynamic logic scheme shows more stable operation in terms of logic-swing and on/off current ratio. Also, there is a merit that we can use the SET only as current on-off switch without considering the voltage gain.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.316-318
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• 2006

It can be considered that the safety of software is combined with that of hardware, and also directly connected to system safety. Because the software in the railway system takes the form of Embedded that let it behave at the system level, instead of independent operation, the safety of the railway S/W is also important. The approach, for ensuring the quality and safety of those software, can be considered with two points of view. Those are views seeing from products, and from processes. The two points of approach are all necessary in the railway system. For the first of all, the process approach is to validate maturity of the organizations in accordance to the judging processes of organizations, which are specified by CMMI(Capability Maturity Model Integration) or SPICE(Software Process Improvement and Capability dEtermination: ISO/IECl5504). In this paper, as the first step of them, we are trying to find approaches to estimate the maturity of manufacturer and assessment organization in the railway system.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1012-1015
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• 1992

A gate-turn-off thyristor (GTO) that has a fuction of self-commutation is a device that can be turned on like a thyristor with a single pulse of gate current and turned-off by injecting a negative gate current pulse. GTOs have been in existence almost from the beginning of thyristor era, recently are these devices being developed with large power-handling capabilities and improved performance, and they are gaining popularity In conversion equipment. In this paper, the effects of internal parameters of GTO model using a circuit containing two transistors and three resistors the switching operation and the turn-off snubber characteristics is investigated using SPICE program.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.2
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• pp.43-45
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• 2000

In this study, present a method for extracting the BJT 1/f noise model parameters fabricated by BICMOS process. From the geometric analysis of the Kf, we show that Kf is in inverse proportion to emitter area. And it is extracting that $K=0.8\times10_{-20}, A_f=2, \alpha=1$ values.