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The present work proposes a self-bias compensation technique for the frequency supply voltage dependence in low cost charge/discharge oscillator topologies. The main bias current of the oscillator will include a supply voltage dependent current. The main goal is to reduce the supply voltage dependence for a range between 1.6 and 2V, for a current starved ring oscillator and a new charge/discharge...
The present work proposes a capacitor charge /discharge based oscillator topology. The circuit is designed for a supply voltage range between 1.6V and 2V, using submicron CMOS technologies. The new oscillator topology brings noticeable improvements from the stand point of the supply voltage influence, power consumption and total implementation area.
Patients with severe health problems often require permanent monitoring using low-power devices for a modern superior medical care. In this paper the design concept and implementation of a low-power medical wireless temperature sensor using hardware reconfigurable devices as an alternative to standard microcontrollers will be described. A hardware design with a Xilinx Coolrunner2 CPLD and high accuracy...
The present work proposes an innovative low voltage, 70 MHz frequency oscillator circuit, designed for sub micrometer technologies, based on constant threshold inverters. The circuit comes as a direct replacement for the current starved ring oscillator topology, featuring low supply voltage influence on the output frequency. The designed supply voltage range is between 1.6V and 2V.
MOSFETs are modern devices used for electronic amplifiers. The MOS transconductance or shortly slope is a very important design parameter because it is directly linked with the magnitude of the amplifier voltage gain. Reducing the electronic devices dimensions in actual technologies creates strong advantages such as higher working frequency, but scaling down the structures has some drawbacks regarding...
Power MOSFETs are modern devices used for electronic switches. They have replaced classical bipolar power junction transistors that were until recently the main choice in power electronics applications. So, a new need for accurate MOSFET switches model in circuit simulators becomes important. The modern models, also called behavioral models, combine device behavior and circuit analysis in one single...
Power MOSFETs are electronic devices used for modern switches. The complexity of mixed-signal system-on-chip using power MOSFETs has increased. Advanced analog and digital interfaces, tough requirements for their safety and reliability impose new advanced methodologies for their simulations. Cadence Virtuoso offers a complex simulation environment including AMS, a mixed digital - analog simulation...
All over the world ionizing radiation is used for medical purposes with risks and benefits. The total dose absorbed by every patient during a medical investigation is generally provided by modern medical equipment and it is usually recorded but it is not cumulated or even expressed using the same units. A pilot Romanian project tries to accomplish one of these tasks. In order to estimate the effective...
This paper presents a new electronic system using an ATmega328P microcontroller, two ultrasonic sensors and two vibrating motors as a new helping solution for blind people navigation. The block diagram, specific requirements and implementations are described in the paper. Specific design problems and experimental adjustments are mentioned. Future optimizations and developing trends are also considered.
This paper presents an alternative solution to cooling applications by means of the Peltier effect, advantageous because there are no moving parts or fluids, leading to safer, reliable, and eco-friendly operation. Driven by DC power, our efficient system uses a Buck converter with custom designed blocks to ensure high performance.
The Romanian project of an integrated system for radiation safety of the patients investigated by radiological imaging methods is presented in this paper. The new system is based on smart cards and Public Key Infrastructure. The new system allows radiation effective dose data storage and a more accurate reporting system.
The continuously increasing number of medical investigations using radiological methods imposes the necessity of recording the radiation effective doses for all patients investigated by radiological methods. In Romania, an applied national research project develops a pilot study that analyses and record such types of data using a patient database, electronic cards for patients and doctors and a secured...
This paper presents an original domotic embedded system for room temperature monitoring. The OpenRemote is the main software interface between the user and the system, but other software components and communication protocols are used, such as 1-Wire protocol for temperature monitoring devices, RS-232 for the central PC unit and OWFS software for remote control using Android mobile devices. The system...
This paper presents an accurate method to determine the atomic and molecular structure of crystal nanomaterials based on X-ray crystallography. Rietveld refinement using EXPO2009 Software has been applied to improve the results. Six different powder samples have been studied.
In this paper an integrated electronic system for syncope detection is presented. The system is based on heart rate monitoring and fall detection and it is able to sent an alert using GPS and GSM support.
In this paper we present the project of an integrated system for radiation safety and security of the patients investigated by radiological imaging methods such as radiographies, computed tomographies or scintigraphies. The system is based on smart cards and Public Key Infrastructure. The implementation of system's architecture has three distinct levels of storage: a central database, many local databases...
In this paper we present a voltage amplifier using a gated diode in breakdown regime. The diode is biased with a constant current and is in common anode configuration. The measured diode was obtained from a commercial nMOS transistor that has the substrate pin available. The circuit will be analyzed in this paper and the theory is in good agreement with the measurements.
Actual MOS transistors models only use empirical models for the variation of the drain current in saturation. This is due to the bidimensional character of the MOS transistor channel. Gradual approximation can no longer be used for the whole transistor analysis due to the channel length modulation. But the gradual approximation still stands for the effective channel length of the transistor. And this...
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