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The Impedance Analyzer is an instrument that measures the magnitude and phase of an electrical one-port network impedance. Linear RLC models of such impedance can be obtained as an extension. The device is a cost-effective system, easy to mount and operate. This is achieved by exploiting the resources of commercial computers with sound cards, using minimum additional hardware and digitally processing...
Resistive dividers for wideband power analyzers have been designed. They have been built with identical resistors connected in series and parallel in a quasi-coaxial structure. Simulations on the PSpice models, the methods developed for their calibration and the preliminary experiments show that the accuracy for frequency up to 20 kHz can be better than 30 parts in 106 for the ratio and 20 µrad for...
We developed a trial model of a 1-kΩ metal-foil resistor with a four-terminal-pair design. The resistance and phase angle of the resistor as a function of frequency were measured. Below a 2-kHz frequency, a slight quadratic change in the resistance was observed. The phase-angle results showed a linear change, and the time constant was estimated from the slope of the linear change.
We developed 100-Ω metal-foil resistors with a four-terminal-pair design. The resistance and phase angle of the resistors were measured as a function of frequency. Below a frequency of 2 kHz, a frequency dependence of the resistance was not recognized within the range of the uncertainties. From the phase-angle results, the time constant of the resistor was estimated to be 3.7 ns.
This paper proposed the AC bridge circuit, which can be used to measure unidentified impedance of the system. The AC bridge circuit takes the advance of both a digital sine-wave oscillator, which can promptly adjust the phase of generated signals, and a successive approximation technique, which can profoundly search for the unknown impedance. Therefore, the optimum phase and the suitable amplitude...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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