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This paper presents a new method to measure a rotor speed using a smartphone camera. An image processing algorithm is proposed to measure the rotation speed, based on the periodic detection of a mark placed on the rotor. Experiments demonstrate our method can estimate rotor speed with a good precision, provided that the camera frame rate is high enough. The method could be very useful for periodic...
In this paper, a lamination of a magnetic sheet and a copper sheet is proposed to obtain wideband shielding effect from kHz to MHz bands. The requirement of the laminated magnetic sheet was discussed. A cap type shield case applying the laminated sheet 53 μm thick was fabricated and its shielding effect was measured. The higher shielding effect was obtained using the proposed sheet in the frequency...
Rigid bar and pantographs are used to power electric railway vehicles. When operating an electric railway vehicle, Rigid bar and pantographs are unstable in contact and occurs Arc. It is the cause of breakdown and accident. In this paper, a contact loss simulator for a rigid bar system was designed and the characteristic of arc is analyzed. Especially, occurrence of arc due to the excitation frequency...
In the 5th generation mobile communication system (5G), the carrier frequency range of mobile communication equipment will be extended to the 6 GHz band and higher, and the number of connected equipment is expected to reach 1 million units/km2. It is assumed that inverter and mobile communication devices are used in close proximity. On the other hand, with the widespread use of inverter equipment...
The interoperability test between electric vehicle and charging equipment plays an important role on the popularization and application of electric vehicles. The principle of control pilot circuit of charging equipment is introduced firstly. Based on new national standard and the new charging interoperability test specification, the interoperability testing device of A.C. charging spot is designed...
This paper briefly recalls the design of a silicon test chip specially conceived to study the noise propagation trough the silicon substrate and the ESD protection. The noise source is a logic block designed to emulate the clock tree of a microcontroller. The experimental results obtained on two versions of the test chip are reported and discussed. The two test chips have the same schematic, but they...
This paper investigates and reports on the susceptibility of commercial voltage references to electromagnetic interference (EMI). Two separate scenarios have been considered. In the first experiment, the interferences are directly injected onto the power supply lines of each voltage reference. In the second measurement, EMI is capacitively coupled to all the pins of the voltage reference under test,...
Even when audio equipment, the sound quality of music playback is deteriorated by various factors. This study examines the deterioration in sound quality due to the type and state of power supply used in audio equipment. We consider that the power supply of the equipment influences the AC potential of the equipment, the propagation noise between parts of the equipment and the audio signal, in that...
This paper presents a 13.5-MHz low-power, RC on-chip relaxation oscillator with split-capacitor technique for RFID application. This oscillator implements only one comparator and one reference voltage to minimize power consumption and silicon area. A loop delay variation cancellation technique that employs an integrator loop and a split-capacitor architecture helps attained the temperature stability...
The paper presents certain procedures oriented towards the decrease of the uncertainty of measuring the small differential signal against a large common-mode signal. The technical implementation of the tracking symmetrical power supply is suggested for the instrumentation amplifier based on the voltage follower that allows increasing the common mode rejection ratio and input impedance and decreasing...
Research in high performance computing (HPC) energy optimization is a growing field motivated by cost and environmental drivers. As commodity server platforms are increasingly deployed as affordably scalable compute clusters, the processor and operating system's energy management capabilities also continues to advance in sophistication. This trend creates a large number of configuration and control...
To be compliant with electromagnetic compatibility standards, integrated circuits such as microcontrollers have to be robust to fast transient burst tests. Because of high voltage and fast transient voltage variations used no measurement is possible during the stress. Lack of information makes the debug of a product a real challenge. The objective of this work is to provide a measurement method which...
This paper proposes a method for analyzing the power supply impedance at an on-chip power supply node in the device under test. The proposed method is based on an on-chip power measurement of a power supply voltage fluctuation with sweeping the frequency of the on-chip current load which sinks a square wave current, not sinusoidal. The method can extract the frequency characteristics of not only the...
This paper describes a CMOS current steering digital-to-analog converter (DAC) with a full-swing output signal. Generally, a normal current steering DAC cannot have a full swing output signal, because conventional DACs have an inevitable voltage drop at the output current cell. In order to improve the drawbacks, we propose a new scheme of quaternary driver and an adaptive output current cell composed...
This study was aimed to design an electrocardiograph (ECG) system by the 0.35 μm CMOS technology. In this study, a two-stage operational amplifier was taken as the building block for the design of instrumentation amplifier and filters. In our measurement, excellent performance was verified by the fabricated chips.
Parametric array transducers are used for long-range and highly directional communication in an air or underwater environments. The power amplifiers for parametric array transducers should have sufficient linear output characteristic and high efficiency to avoid communication errors, system heating, and fuel problems. But the conventional power amplifier with fixed source voltage is very low efficient...
This paper shows a methodology to reduce electromagnetic radiation in typical CMOS digital systems from chip PDN design point of view. Total PDN property with anti-resonance peak can be strongly affected by on-die PDN property. Then, in order to suppress anti-resonance peak in total system PDN, design of chip PDN is more effective than off-chip damping method. Then, two similar test chips were designed...
The paper presents measured radiated emissions of an electronic module in the frequency range 150 kHz–200 MHz using the TEM cell method. The TEM cell measurement method is explained and measurement results for different orientations of the electronic module are presented. An explanation for the differences in the measured radiated emissions for different module orientations is given.
Charge pump circuits are currently becoming a realistic alternative to the switching regulators in high voltage generation applications, especially in fully integrated circuit systems. This paper discusses several stabilization methods to improve voltage performance and robustness of integrated high voltage charge pumps. All the discussion and measurements are based on a monolithic integrated high...
Integrated circuits (ICs) sometimes fail when their power supply is disrupted by external noise, like an electrical fast transient (EFT). Soft failures in these cases are often caused by timing errors in the IC, for example when delays through logic become too large to meet internal timing constraints. Methods are needed to predict when these failures will occur. A closed-form expression is proposed...
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