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Design of compensator for Engine Intake system model with Turbocharger by Extended Kalman Filter
Masatoshi Ogawa,Harutoshi Ogai,Yasuaki Inoue,Naozumi Okuda,Akira Ohata 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In order to apply an engine intake air system model to engine control, it is necessary to calculate the intake air system model quickly and accurately under constraints of computational performance. Therefore, a study has been made on a method for calculating the intake air system model implemented by an analog LSI at short times. However, the problem is to include the model error in the intake air system model based on the analog LSI of present state. This paper reports a compensation of the intake air system model with error by Extended Kalman Filter (EKF).A basic model that reproduces model errors of analog LSI model is built, and a compensator based on EKF is designed. As a result, it is confirmed that the compensator reduces the model errors by half. Moreover, this paper reports the numeric solution in order to reduce the hunting phenomenon of the engine intake air system model.
A Trapezoidal Method for Solving Differential Algebraic Equations
Junjie Huang,Qiang Li,Kiyotaka Yamamura,Yasuaki Inoue 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper presents a new trapezoidal method with extra calculation of dx/dt to avoid the trapezoidal ringing phenomenon in circuit simulation. Comparison between the traditional and proposed trapezoidal methods is verified by the error assessment and the result dedicates that the new method works out and the improvement is obvious. This algorithm is meaningful to the numerical analysis in circuit simulators for solving differential algebraic equations under both linear and nonlinear circumstances.
A 3.6V Rail-to-Rail Operational Amplifier with Constant g<SUB>m</SUB>
Chang Gao,Qiang Li,Jing Wang,Yasuaki Inoue 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
A 3.6V CMOS rail-to-rail operational amplifier with a novel constant gm (transconductance) biasing circuit is proposed. The rail-to-rail input stage is realized by connecting two complementary differential pairs in parallel. To obtain constant gm across the whole common mode input range, the drain currents of differential pairs are precisely controlled by proposed biasing circuit. This design is verified by simulation using a 0.18㎛ CMOS process. Simulation result shows a rail-to-rail input/output range and a constant gm with ±2.45% variation. Also an open loop gain of 88dB, unity gain bandwidth of 1.17MHz and phase margin of 63° are achieved.
A Two-stage CMOS Integrated Highly Efficient Rectifier for Vibration Energy Harvesting Applications
Li, Qiang,Wang, Jing,Niu, Dan,Inoue, Yasuaki The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.4
We report, in this paper, a highly efficient CMOS rectifier for low power energy harvesting system. By using two-stage structure and a novel active diode, the rectifier can work at a wide range of input voltage amplitudes of 0.45V up to 1.8V under a standard 0.18um CMOS process. A comparator that consists of common-gate stage and control stage is designed to control the switch of the active diode. The proposed rectifier can achieve a peak voltage conversion efficiency of over 96% and a power efficiency over 90%. Simulated power consumption of the rectifier is 197nW at 450mV, which is about 30% smaller than the best recently published results.
An Efficient Cockcroft-Walton Type Charge Pump with Level Shift Control Circuit
Qian Guo,Renyuan Zhang,Qiang Li,Yasuaki Inoue 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
An efficient Cockcroft-Walton type charge pump (CP) is proposed in this paper. In the proposed charge pump, to overcome the reverse current problem, a level shift control circuit is used, which would increase the efficiency. The CP is verified by circuit simulation, using a standard 0.18μm CMOS process. The simulation results indicate that the voltage boosting efficiency of the charge pump is 99.1% when the load current is 1μA while the conventional circuit drops to 96.7%. The power efficiency of the proposed circuit is 85.4% when the load current is 100μA without the stray capacitance.
A Nanopower Supply-Insensitive CMOS Vth Extractor
Jing Wang,Qiang Li,Li Ding,Yasuaki Inoue 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, a nanopower supply-insensitive CMOS threshold voltage extractor circuit is proposed, which can meet today’s industry demands for portable devices to operate under very low power consumption and large supply voltage variations. Simulation results, based on CMOS 0.18um process, show that, the threshold voltage of CMOS transistors can be extracted with less than 0.01% error for wide power supply range. At the same time, the proposed Vth extractor can operated with less than 300nW power consumption for 1.3V power supply.
Cross-coupled Transistor Load Structure in Differential Pairs
Wenqin Xu,Qiang Li,Jing Wang,Yufeng Sun,Yasuaki Inoue 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
The cross-coupled transistor structure has been widely utilized in LSI circuits. This paper presents a cross-coupled transistor load structure for differential amplifiers and the performance of the structure is analyzed. The differential amplifier composed of the cross-coupled transistor load structure and the differential pair is verified by circuit simulation and the simulation results indicate that the structure can improve the performances of the differential amplifier in several parameters including the gain and the quiescent current.