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GaN-FETs are attractive switching devices for their fast switching capability. However, they often suffer from the oscillatory false triggering, i.e. a series of self-sustaining repetitive false triggering induced after a fast switching. The purpose of this paper is to derive a design instruction to prevent this phenomenon. According to the previous study, the oscillatory false triggering was found...
SiC-MOSFETs have attracting increasing attention because of their outstanding characteristics that contributes to high efficiency and high power density of power converters. However, compared to conventional Si-IGBTs, SiC-MOSFETs are susceptible to false triggering, because they tend to generate large switching noise due to ultrafast switching capability and have a lower threshold voltage in high...
This paper presents a mmW frequency generation stage aimed at minimizing phase noise via waveform shaping and harmonic extraction while suppressing flicker noise upconversion via proper harmonic terminations. A second-harmonic tank resonance is assisted by a proposed embedded decoupling capacitor inside a transformer for shortest and well controlled common-mode current return path. Class-F operation...
This paper presents a novel approach for the optimal design of RC snubbers, valid for very high frequencies from 30 MHz to 300 MHz. The integration of monolithic RC snubbers poses new design challenges, which are not covered by conventional design approaches. Our method avoids commonly made simplifications and therefore overcomes these challenges. A half-bridge circuit is used in the experiments to...
This paper presents a mitigation method to reduce the current oscillation in the DC-link. DC link distributes power to common connected converters. Unwanted current oscillation can be found in the DC-link thus reduce the stability and reliability of the electromobility system. The root cause for the current oscillation is analyzed and an effective damping circuit is proposed. The verification measurements...
A novel read-out circuitry for Linear Variable Differential Transformers (LVDT) is presented in this paper. The proposed method avoids the use of low distortion sine wave oscillators for primary excitation and the associated phase compensation circuitry. The read-out circuit uses the secondary coil of an LVDT as part of a Colpitts oscillator along with a frequency counter to derive the position information...
We obtained frequency increase in resonant-tunneling-diode (RTD) terahertz (THz) oscillators by thick antenna electrode. The THz oscillator was composed of an RTD and slot antenna. Because an oscillation at resonance frequency of the RTD and slot antenna occurs when the negative differential conductance of the RTD compensates for the loss of the antenna, a reduction in the conduction loss and inductance...
This paper presents the design and implementation of a fully-integrated CMOS accelerometer using bondwires as sensing devices without Micro Electro-Mechanical Systems (MEMS) processes. The model and analysis of bondwire inertial sensors are provided for further implementation of low-power and low-noise accelerometers. Finite element method (FEM) simulation is performed to verify the concept and model...
Measuring the position of a moving or rotating target is one of the basic tasks for position control applications. Especially in the area of magnetic bearings, this plays a crucial role for stable levitation. Hence, the demand on reliable and affordable position sensor systems is high. Thereby, the sensor should feature high dynamics, a high resolution and low noise. State of the art systems are typically...
This paper presents vehicle detection system based on one of the successful intrusive method and also offerings an innovative scheme of an embedded multi-lane traffic control. The proposed system has an ability to detect and classify the vehicle continuously and consciously under the embedded adaptive algorithm, the result is automated traffic control. Inductive loop involves smaller loop within big...
This paper presents a technique for quadrature phase generation in an LC oscillator by sharing a single turn inductor between a pair of oscillators. This special structure of the inductor cancels the magnetic flux within the loop, and thereby allows placement of other components beneath it. A Vernier-scale based capacitor-DAC is implemented to achieve fine frequency tuning. The circuit is implemented...
This paper presents a comprehensive study of the design aspects of eddy-current displacement sensor (ECS) systems. In accordance with the sensor analysis presented in this paper, design strategies to compensate for important sensor imperfections are recommended. To this end, the challenges that are associated with ECS interfaces are identified, with focus on advanced industrial applications. This...
Using a differential voltage current conveyor transconductance amplifier (DVCCTA) device with a single RC-section some new synthetic grounded lossless inductor circuits are proposed. The inductance (L) is practically active-insensitive to the device port mismatch errors (ε) and there is no component matching constraint. With a nonideal device, the presence of small parasitic shunt capacitances at...
In the resonant-grounded distribution network, series resonance between the Peterson coil and the network zero-sequence capacitance after an arc incident presents great danger to the safe operation of the network. The key to solve this problem is to identify the exact arc extinguishing time. Based on the principles of transformer-based arc suppression coil (TASC), this paper introduces an arc extinguishing...
Quartz crystal (QC) is one of the well-known piezoelectric materials. However, it was used as a proximity sensor in air in this work. This work stabilized the voltage output to an oscillator circuit connected with a QC. As the thickness-shear mode QC moved closer to the conductive plates from 10 mm to 5 mm while the other electrode was coated with an acrylic rubber compound to eliminate the quality...
This paper presents design and simulation of two temperature compensated LC Colpitts reference oscillator. First uses an on-chip differential inductor while the other one uses bondwire inductor. Technology is 0.35 mum 2P/4M CMOS technology with high resistivity poly and thick metal option. Oscillator with on-chip differential inductor consumes 7.5 mA from 2.5 V supply and absolute peak frequency deviation...
We present a simple nonlinear resonant analog circuit which demonstrates quantization of resonating amplitudes, for a given excitation level. The system is a simple RLC resonator where C is an active capacitor whose value is related to the current in the circuit. The excitation voltage, synchronously switched at the current frequency, enables electrical supply while keeping the oscillation of the...
This paper presents the concept of using a MEMS piezoelectric actuated tunable inductor in the design of a wideband high performance VCO. Furthermore, a model of the tunable inductor is presented to facilitate the VCO design and simulation. In addition, by means of this model important characteristics of the tunable inductor can be derived enabling a design of the VCO to be superior in phase noise...
A novel compact coupled planar resonator (CCPR) based VCO (voltage controlled oscillator) using mode-coupling technique was developed in response to expensive high Ceramic and SAW resonators based signal source for wireless communications. One of the problems related to the conventional Ceramic/SAW based resonators (with high Q and low phase noise) is the challenge for integration in IC form. Instead...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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