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This paper describes the investigation on relative bandwidth, frequency range and thermal properties of the high directivity planar couplers realized in microstrip line technology. The basic idea is that coupling structure is attached to two transmission lines at two points only. The coupling structure is realized using SMD capacitances and inductances soldered to the microstrip lines. Frequency limit...
An investigation of the voltage imbalance of the two capacitors of the semi-full-bridge submodule is performed. Since the capacitances are not exactly the same, there may be a difference between the capacitor voltages. The resulting current-spike when they are connected in parallel has been analyzed in a full-scale laboratory experiment.
Reference drivers for charge-redistribution SAR ADCs require significant area and/or power. In this work, a low-power and area-efficient passive reference-voltage driving scheme for charge-redistribution SAR ADCs is proposed. An on-chip decoupling capacitor is pre-charged to a reference voltage during tracking phase and utilized to drive the DAC passively during conversion. The reference-voltage drops...
We propose a novel class-AB second-generation Current Conveyor (CCII) based on the class-AB Flipped Voltage Follower (FVF) topology, and compare it with a class-A CCII based on the conventional FVF. The AB-FVF is capable of driving larger capacitive loads, showing faster settling. Furthermore, it can drive the Z output with currents larger than the biasing ones, improving power efficiency. A modification...
In this paper a comparative loss analysis between a cascaded H-bridge (CHB) low-capacitance static compensator (LC-StatCom) with symmetrical I-V characteristics and a conventional CHB StatCom is presented. Effect of the capacitor voltage ripples on switching and conduction losses are determined through theoretical analysis. Simulation-based analyses on a 350-VA three-cell CHB LC-StatCom system are...
This paper investigates the switching performances of two state-of-the-art half-bridge SiC MOSFET modules using a standard double pulse test methodology. A deliberate choice of the modules with the same voltage and current ratings, the same packaging, but different stray inductances and capacitances is made in order to give an insight into the influence of parasitics in the switching transients and...
A 12 b 600 MS/s 2 × TI SAR ADC achieving 60 dB SNDR at Nyquist is presented. Time-interleaving errors are calibrated in the background by using a linear but noisy reference ADC. A test chip demonstrates that interleaving spurs are reduced to below −70 dBFS using an off-chip least-mean-squares (LMS) algorithm. The reference ADC is an 8 b SAR with reduced sampling capacitance and input amplitude. This...
The adoption of charge-redistribution-technique-based successive approximation register (SAR) architecture in capacitance domain has improved the performance of the digital readout circuit used for capacitive sensor applications. The direct conversion of an off-chip sensor's capacitance to a digital value requires a large implemented capacitor array. A scale factor scaling the reference voltage is...
A novel algorithm for the iterative geometric optimization of EMI filters is presented. The two step approach of an equivalent electric circuit extraction, followed by a sensitivity analysis in the circuit as well as the 3D model domain drives the shape optimization. This allows for a deeper insight into coupling paths and their cause in the model, and their effect in the circuit domain. The concept...
This paper studies a capacitive coupling wireless power transfer (CCWPT) for charging electric vehicles by using the dielectric substrate outside of a vehicle. The CCWPT can replace a conventional inductive coupling wireless power transfer because it has less electro-magnetic interference (EMI) and heat dissipation. However, since the CCWPT has limitation on transferring high power due to too small...
This paper presents a trimming correction technique to calibrate the offset in capacitive readout circuits of MEMS sensors. The technique relies on a N-bit digital voltage divider which allows to implement an equivalent variable capacitor with sub-femto Farad step variations. To reduce area occupation, a hybrid approach entailing both resistive and capacitor voltage dividers is introduced. Design...
The paper presents SPICE models of nonlinear capacitors for analysis of ferroelectric circuits. The capacitors can be defined by either charge-voltage or voltage-charge closed form expressions. Additionally the model for series connection of any number of nonlinear capacitors is proposed. The model takes into account trapped charges of internal connections. Numerical experiments for ferroelectric...
Ensuring that the DC voltage remains within an acceptable range is a major concern for HVDC systems. In DC systems, the capacitance is the dominant factor that determines the volatility of the DC voltage against sudden disturbances in analogy to inertia of the AC system characterizing the rate of change of the frequency. As a solution to this problem, the authors of this paper previously proposed...
Reliability is one of the key features that is sought after in converter design. Electrolytic capacitors are the most common capacitor type in switching mode power supplies to be used as a DC bus energy storage. However, electrolytic capacitors are known to degrade due to aging. This paper introduces a capacitance degradation detection method for a step-down DC-DC converter that is based on introducing...
This paper presents a fully integrated dc-dc converter with on-chip double galvanic isolation. The converter exploits only two dice both fabricated in a 0.35-μm BCD technology with a thick-oxide back-end for 5-kV galvanic isolation. It uses a novel architecture to transmit power across two isolation barriers, which are performed by integrated capacitors and transformers. LC coupling inherently enables...
This paper presents the design of a low-complexity, linear and sub-pF CMOS capacitance-frequency converter for reading out capacitive bacterial bio/sensors in an attempt to create a widespread bio/sensor readout module. The significant design objectives included a high resolution as well as an extensive dynamic range. The circuit was based on a method which outputs a digital frequency signal directly...
The method of calculating a compensating device for a dual-frequency power supply of a crucible furnace equipped with a dual-section inductor with counter winding is given in the article. A special frequency converter provides power to sections from two current sources of different frequency and equal amplitude. Electromagnetic, hydrodynamic and thermal processes in an induction crucible furnace with...
Piezo-electric harvesting systems have proved to be a promising alternative to batteries for supplying portable devices. Recent trends focus on the reduction of the size of piezo-electric transducers through the development of nanostructured materials which exhibit output power levels in the order of few microwatts as well as maximum open voltage sources lower than 2 V. In this paper, we propose a...
We present a second generation current conveyor (CCII) based electronic interface for differential capacitive sensors. The sensor interface performs a capacitance-to-voltage conversion and has been designed in a discrete board as well as in an integrated version showing a linear input/output characteristic. Simulated and experimental results conducted on the discrete element board employing the low...
This paper presents a method to model external capacitors behavior face to continuous and transient events. Temperature and the physical dimensions of the capacitors have been considered in order to predict Electromagnetic Compatibility performances of an equipment or a system. The different tests were performed on ceramic capacitor series X7R from Murata. A model has been developed in Verilog-A....
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