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This paper pinpoints some design aspects on RC-oscillators for the synthesis of pure sine waveforms aimed at characterizing nonlinear distortion of high-resolution analog-to-digital converters. Preliminary results for a specific RC-oscillator indicate 2nd harmonic distortion 110 dB below carrier and much lower than this for higher order harmonics. Some ADC characterization results are shown.
A comprehensive nonlinear model of GaAs resistor is developed based on DC, pulse and power measurements. The model accounts for electrical and thermal feathers such as velocity saturation, self-heating and breakdown effects. The resistor nonlinearity is mainly due to the velocity saturation, and enhanced by self-heating effect. The model provides accurate performances in DC, transient and harmonic...
Electricity supply to Universiti Teknologi PETRONAS (UTP) is provided by two generating units at gas district cooling (GDC) plant located in the campus. Under normal operation, UTP power system is operating in island mode and during emergency, it will be connected to utility grid of Tenaga Nasional Berhad (TNB). Each generating unit is grounded through neutral earthing resistor (NER). It has been...
The objective of this paper is to evaluate experimentally the increase of electrical losses under nonsinusoidal situations. Such evaluation is done by calculating the energy dissipated in a resistor based on temperature measurement. In order to obtain a practical result, two kinds of tests are performed: one measuring the heating caused by a distorted wave of current and another for each harmonic...
Due to their higher transmit efficiency and better received SNR compared to single layer technology, multilayer transducers with uniform layers (MLU) are currently in research and use. Altering the intrinsic geometrical or material homogeneity (i.e. different thicknesses of the constitutive layers, piezoceramic/piezocomposite or piezoceramic/piezopolymer stacks) will increase the available degrees...
Thermal functional circuits are an interesting and perspectivic group of the MEMS elements. A practical realization is called quadratic transfer characteristic (QTC) element which driving principle is the Seebeck-effect. In this paper we present the analyses of a QTC element from different perspectives. To check the real behaviour of the device, we measured a few, secondary properties of the structure...
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