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In this paper, the effects of geometrical discontinuities and topological structure on Rotary Travelling Wave Oscillators (RTWO) are studied. Using the 3D electromagnetic simulator EMPro Simulation Software Design Platform, we have found that reducing the corner discontinuities can increase the oscillation frequency up to 3.34%. Additionally, we observed that the topological structure of the RTWO...
This paper presents a design method of digitally controlled oscillator (DCO) to increase the accuracy for expectations in terms of frequency range and frequency step. Parasitic inductances by routing lines make nonlinear frequency steps and unexpected frequency range. Aluminum (Al) pad metals with very large width are employed as a pattern for eliminating parasitic inductance (PEPI). Since considerably...
A new electronic interface for inductive sensors is presented. The proposed circuit is basically a current-feedback operational-amplifier (CFOA)-based sinusoidal oscillator circuit. The circuit uses only one externally connected inductor and exploits to advantage the internal poles of the CFOA. Sinusoidal oscillation at frequency of 122.1 MHz was obtained using the AD844 CFOA and an inductor of inductance...
Quartz crystal (QC) is one of the well-known piezoelectric materials. However, it was used as a proximity sensor in air in this work. This work stabilized the voltage output to an oscillator circuit connected with a QC. As the thickness-shear mode QC moved closer to the conductive plates from 10 mm to 5 mm while the other electrode was coated with an acrylic rubber compound to eliminate the quality...
The flux distribution in certain inner-coil type thin film cores is discussed, and equivalent magnetic circuits for the distributed flux are derived based on the theory of distributed-constant circuits. The equivalent circuit has a simple structure and enables accurate determination of the core inductance. The validity of the equivalent circuit is demonstrated for a sandwich-type YIG inductor, which...
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