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This report studies the influence of printed circuit board (PCB) design on voltage overshoot and ringing oscillation in switching operation of gallium nitride gate injection transistor (GaN-GIT) for high-frequency DC-DC converter. The parasitic inductances in the main power loop have been identified based on moment of method (MoM) analysis and frequency characteristics of impedance measured with 2-port...
This study discusses the design process of a novel fully autonomous ultra-low power hybrid RF/photovoltaic energy harvesting system. As a result of the simulated and measured relationship between the output voltage of the rectifier and the load resistance value, the optimal rectifier topology and the charge tank capacitor value are analytically determined. One proof-of-concept designed and fabricated...
A three-phase ac-ac matrix converter for inductive power transfer (IPT) systems with soft-switching operation and bidirectional power flow is introduced. The proposed converter can generate high-frequency current directly from a three-phase ac power source without a dc link. Unlike conventional ac-dc-ac converters, the proposed converter can provide a high frequency current without any current sag...
Pulse Width Modulated AC drives equipped with small DC-link capacitor are becoming an attractive solution for electric drive applications with moderate requirements for shaft dynamic performance. However, when these drives are fed from a weak grid a resonance between the line side impedance and the DC-link capacitor appears. Due to this resonance, the THD and the partially weighted harmonic distortion...
In this paper we present a minimal sized CMOS thyristor based oscillator, which is able to provide a clock signal of ≈20 Hz. The oscillator was designed as a timer or clock generator for autonomous microsystem applications. The chip area of the oscillator is 18 µm by 35 µm and it is able to run for more than 10 minutes when supplied from a 10 nF capacitor. The oscillator's time constant is determined...
Multilevel Cascaded H-Bridge (CHB) converters have attractive features for the implementation of large scale photovoltaic systems. They can be directly connected to high voltages and the multilevel voltage synthesis reduces the harmonic distortion introduced. In addition, they have individual DC links ideal for connecting photovoltaic arrays. Existing high performance voltage balancing techniques...
This paper describes a simple approach to perform differential capacitance measurements by the design and characterization of a dedicated electronic circuit. Capacitance transducers provide information about changes in capacitance in response to a physical variation. They are used in many types of applications such as linear displacement sensors, pressure transducers and accelerometers. The operating...
In this paper, we present a MOSFET-based Colpitts oscillator based on a “zero-threshold” transistor operating at a supply voltage below 20 mV. The circuit was carefully analyzed and expressions relating the start-up conditions and the voltage supply, as well as the oscillation frequency were developed. Measurement results obtained on a discrete prototype confirmed the low-voltage operation of the...
This paper presents a bandgap reference capable of operating at supply voltages below 1V. In contrast to the vast majority of bandgap circuits the multiplication of the proportional to absolute temperature voltage is done by a switched capacitor network. Thus a reduced chip area is achieved. As a clock is needed for the switching, a relaxation oscillator is deeply integrated into the circuit. Combined...
This paper presents an innovative switched capacitor voltage regulator dedicated to ultra-low power wireless sensor nodes. The regulator supports most of the different power supplies used to power such sensor nodes. Using a linear regulator in parallel improves the dynamic response compared to state-of-the-art switched capacitor regulators. Measuring the load current allows adapting the oscillator...
Electro-statically driven micro-mechanical structures are an interesting and frequently used category of MEMS elements. Investigation of their properties is important both for better understanding the device operation and for fault detection and diagnosis. To follow the movement of micro-parts in such elements involves difficulties since device packages inhibit looking into the chip. Our motivation...
The characteristic curve of the ordinary MOS capacitor is not monotonic, whereas the Laterally Diffused MOS (LDMOS) capacitor has a nearly ideal monotonic property. An oscillator based on LDMOS capacitor is designed and implemented using the standard 0.5 mum CMOS technology, and various essential factors have been considered, such as the layout size, the power consumption and the capacitance value,...
The Z-source converter (ZSC) is an alternative power conversion topology that can both buck and boost the input voltage with improved reliability. Dynamic modeling of the ZSC from different perspectives has been studied. Based on these models, the dc-link voltage is controlled using direct measurement or measurement of the capacitor voltage. In this paper, two methods of dc-link voltage control of...
This paper presents a realization of an ultra low power ring oscillator in 0.14 mum bulk CMOS technology. The application field for this oscillator is the clock generation for a baseband processor of a passive ultra high frequency (UHF) radio frequency identification (RFID) transponder. This technology will play an important role in the field of automatic identification. The paper contains simulation...
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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