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A system and source joint estimation method for EM emission modeling is proposed in this paper. Based on the priori knowledge, i.e., the transfer function of system is smooth and the form of source signal was already known, the paper using joint estimation method to solve modeling problems when measured only the emission amplitude spectra at some ports. Experimental results verify the method could...
Processes in the power scheme double-bridge series resonant converter are considered. The equivalent circuit of the converter based on the imposition of linear active resonant contours with sources of rectangular form voltage is applied to the analysis of processes. The expressions for the discrete the control-to-output-envelope transfer functions of the active resonant contour and of the resonant...
High-speed train is supplied by alternating current (AC) power and bases on single-phase four quadrant (4Q) converter as one necessary part of the ‘AC-DC-AC’ transform process. The discrete mathematical model for a single-phase 4Q converter is derived with small disturbance method and digital control delay effect is considered in 4Q converter modeling and analysis. Focusing on stability characteristics...
The Boost converter with digital current-mode control and leading edge modulation is modeled in z-domain first in this paper. The influences of time delay and zero-order holder (ZOH) on digital controlled converters are taken into consideration. Then, the corresponding circuit model is established and simulations are performed to show the effectiveness of the z-model. It's shown by simulations based...
The paper presents an improvement of sensitivity and tolerance analysis method for the Voltage-Controlled Oscillator (VCO) circuits with Van der Pol model. The tolerance analysis method is based on the Monte Carlo Analysis (MCA) and on the Fast Monte Carlo Analysis (FMCA) based on the circuit transfer function. The circuit sensitivities are computed by means of the derivatives of the circuit transfer...
This paper will establish a closed-coupled oscillator model of the wide bandwidth ultrasonic transducer for ultrasound image application. Referring to the acoustical impedance matching theorem, the bandwidth depend on different matching impedance of the matching layers is investigated, and then the wide bandwidth ultrasonic transducer can be obtained. In order to shorten the pulse-echo duration time,...
This paper presents the theoretical study of a monolithically integrated NEMS/CMOS oscillator with electrostatic actuation and piezoresistive detection. A feedback circuit based on a single active transistor is implemented. The proposed architecture is so compact that it can be implemented with ease in a sensor array application for example. A brief description of the NEMS resonator is given and the...
MetiTarski, an automatic theorem prover for inequalities on real-valued elementary functions, can be used to verify properties of analog circuits. First, a closed form solution to the model of the circuit is obtained. We present two techniques for obtaining the closed form solution. One is based on piecewise linear modeling and the inverse Laplace transform. The other is based on small-signal analysis...
Constant on-time current-mode control has been widely used to improve light-load efficiency, because it can reduce the switching frequency to save switching-related loss. Therefore, an accurate model for constant on-time control is indispensable to system design. However, available models for constant on-time control are unable to provide accurate physical insight and predict the system response,...
In this paper, a general first order structure using dual output OTA is explored to derive new first-order and second-order filters using OTAs with dual outputs and grounded capacitors. Two first-order all-pass filters that have been obtained are presented together with an analysis of non-idealities of OTAs viz., finite bandwidth and parasitic output and input resistances and capacitances. Second-order...
Simultaneous switching noise (SSN) is an important issue for the design and test and actual ICs. In particular, SSN that originates from the internal logic circuitry becomes a serious problem as the speed and density of the internal circuit increase. In this paper, an on-chip monitor is proposed to detect potential logic errors in digital circuits due to the presence of SSN. This monitor checks the...
In this paper, feedback control design of Zero-Voltage-Switched Quasi-Resonant dc-dc converters is presented. The power stage model is derived by a method of circuit averaging, while the control stage model, consisting of an Error Amplifier (EA) and Voltage Control Oscillator (VCO), determined by the input/output relationship of the circuits. The obtained models are used in feedback control design...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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