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Recently, an efficient damped pseudo transient analysis method was proposed to find DC solutions for nonlinear circuits. However, the simulation efficiency is still not satisfactory. In this paper, for different kinds of circuits, we get some groups of PTRAN algorithm control parameters values by using a parameter optimization algorithm for pseudo-transient analysis to obtain higher efficiency during...
In circuit simulation, it is of great importance to compute DC operating points of nonlinear circuits. However, the Newton-Raphson method employed in some SPICE-like simulators often fails to obtain a solution. To solve the non-convergence problem, homotopy methods receive abundant attention and have been studied from various standpoints. As to homotopy methods, the convergence property is fundamentally...
Recently, an efficient and globally convergent Newton fixed-point homotopy method (NFPH) for MOS transistor circuits has been proposed to find dc solutions of nonlinear circuits. However, the programming of sophisticated homotopy methods is often difficult for non-experts. In this paper, an effective netlist implementation method for the MOS NFPH method is proposed and it can implement the MOS NFPH...
This paper presents a high efficiency comparator-based CMOS rectifier for wireless power transfer in biomedical implant devices. By using a novel ON-OFF compensation technology, the conduction time of the switch can be optimized and the reverse current has been reduced efficiently. The proposed rectifier was verified using a standard 0.18μm CMOS process. Results shows that the rectifier can achieve...
The damped pseudo-transient analysis (DPTA) method, of step 1 up to 3 are described as they are applied to a nonlinear circuit. The DPTA method with an effective implementation based on SPICE3 is compared to the pure pseudo-transient analysis and compound element pseudo-transient analysis (CEPTA) methods, and is shown to be more efficient. The first order multi-step linear integration algorithms,...
The pseudo transient-analysis method is regarded as one of the most effective method to find DC operating points for nonlinear circuits. In this paper, we combine the ramping method and the damped pseudo-transient analysis algorithm together in order to improve the simulation efficiency. By combing the two algorithms together, the oscillation problem and time-consuming problems can be greatly eliminated...
Since the magnetic resonant coupling was suggested for wireless power transfer (WPT), the theoretical analysis and experimental verification of resonant coupling structures have been investigated. However, the relationship between the performance characteristics and the load conditions has not been fully explored yet. In this research, a magnetic resonant coupling wireless power transmission system...
In this paper, new numerical integration algorithms with artificial damping effect are proposed which can be applied to the constant, pure PTA method to find DC operating points of nonlinear circuits when the Newton-Raphson method fails. This method can effectively avoid the oscillation and the “time step too small” problems compared with conventional PTA algorithms. The mathematical description for...
With the scaling of CMOS devices toward their ultimate dimensions, device performance variability induced by process variation has become a critical issue in analog LS I designs. Statistical device model library building based on statistical device model considering the process variation accurately is useful to predict the performance of analog LS I designs. However, conventional statistical device...
Recently, the compound element pseudo transient analysis method, CEPTA, is regarded as an efficient practical method to find DC operating points of nonlinear circuits when the Newton-Raphson method fails. In this paper, an effective SPICE3 implementation algorithm for the CEPTA method is proposed. It can significantly improve simulation efficiency with smaller limitations during simulation. Besides,...
The overshooting effect, which is induced by the input-to-output coupling capacitance, has an significant effect on CMOS gate delay with the scaling of CMOS technology. In this paper, an effective analytical model is proposed to calculate the overshooting time of multiple-input gates. The proposed model is verified having a good agreement with SPICE simulation results.
In retargeting of a nano-watt CMOS reference circuit, we adopt an advanced compact MOSFET model to describe the drain current consistently in strong and weak inversion levels. Based on this model, we describe all bias conditions in terms of ratios of the channel widths and lengths. Taking the effect of very long channels into account, we formulate the threshold voltage as a function of the drain-source...
Finding DC operating points of nonlinear circuits is an important and difficult task. The Newton-Raphson method adopted in the SPICE-like simulators often fails to converge to a solution. To overcome this convergence problem, homotopy methods have been studied from various viewpoints. However, most previous studies are mainly focused on the bipolar transistor circuits. Also the efficiencies of the...
Finding DC operating points of nonlinear circuits is an important and difficult task. The Newton-Raphson method adopted in the SPICE-like simulators often fails to converge to a solution. To overcome this convergence problem, homotopy methods have been studied from various viewpoints. However most previous studies are mainly focused on the bipolar transistor circuits and no paper presents the global...
This paper presents a sub-0.3V CMOS full-wave rectifier for energy harvesting devices. By adopting a body-input comparator with simple bias circuit and body bias technique, the lowest input voltage amplitude can be reduced to 0.28V when using a standard CMOS 0.18µm process. The voltage drop of negative voltage converter can be reduced to enhance the output voltage by the body bias technique. In combination...
With the advent of nanometer age in digital circuits, the overshooting time becomes a dominating component of gate delay for CMOS logic gates. Till now, few researches have focused on the overshooting effect of multi-input gate. Therefore, in this paper, an effective model considering the overshooting effect of multi-input gate is presented. The experimental results using 32nm PTM model reflect that...
Recently, the power management becomes significantly important for the ultra power wireless sensor node powered by energy harvesting devices. In this paper, a power management system from battery to wireless sensor node is proposed for wireless structure health monitoring applications. By using the proposed circuits, the power supply of a sensor network node is switched on only when some event is...
A Cockcroft-Walton type charge pump circuit is proposed in this paper. Compared with Dickson type, each transistor and capacitor in the proposed circuit just stand against the voltage less than one Vdd, so that a low break-down voltage process can be applied to this kind of charge pump to reduce the chip area cost and break-down risk. By using the proposed structure, the performances of voltage boosting...
A GIDL (Gate Induced Drain Leakage) current model for advanced MOSFETs has been proposed and implemented into HiSIM2, first complete surface potential based model. The model consists of one tunneling mechanism considering two tunneling currents, band to band tunneling (BTBT) and trap assisted tunneling (TAT), and requires totally 7 model parameters covering all bias conditions. Simulation results...
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