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Designing, optimizing and producing modern power amplifiers (PA) requires new and fast RF (radio frequency) measurement techniques capable of characterizing its real behavior. PAs are a truly multidimensional device where many desired performance parameters are contradictory to each other. This is especially true for the generation of modern communication PAs that require high efficiency, high linearity...
The mismatch uncertainty in microwave power sensor calibration system is analyzed. Propagation of uncertainties from the reflection coefficients in real and imaginary format are considered. Monte Carlo method (MCM) is used to estimate the probability distribution function (PDF) of the mismatch factor, which is found to be non-Gaussian for small reflection coefficient values. The mismatch uncertainties...
Redundancy is a common approach for ensuring reliability on applications using UPS inverters. However, overall system's reliability and efficiency is very dependent on the power measurement precision, which if not properly done can lead to system failure. Current transformers, that are widely used to measure the output current of UPS inverters, introduce a phase shift in the output signal that negatively...
Several wireless systems and networks share the same or contiguous frequency bands to provide wideband connectivity. Due to the different channel access techniques, the related communication signals are often transmitted, at the same time, over frequency intervals partially or fully overlapping to one another. In such cases, classical approaches either in the frequency or joint time-frequency domain...
Received signal strength indication (RSSI) is a measurement function nowadays widely available in many wireless communication devices. The use of RSSI for radio frequency power measurements is here discussed. In particular, a procedure is proposed for improving the use of RSSI for power measurement tasks. The aim is to show how this function, suitably designed for communication protocol tasks, can...
A measurement system based on microwave transition analyzer (MTA) as a receiver is proposed for time domain and frequency domain characterization of linear and non-linear N-port microwave devices. The proposed measurement system is able to perform full S-parameters characterization for N-port devices with only one measurement connection step. The system is also sensitive to the input power variation...
A further step towards the realization of an innovative instrument for power measurements in DVB-T systems is taken. Past research activity was addressed to the design of the digital processing section, and specifically on the optimization of the measurement algorithm based on sequential Burg estimator. The present work accounts for the digitizing section of the instrument. In particular, bandpass...
In many engineering applications, linear models are preferred, even if it is known that the system is nonlinear. A large class of nonlinear systems, excited with random excitations, can be represented as Y = GBLAU + YS, with GBLA the best linear approximation, and YS a nonlinear noise source that represents that part of the output that is not captured by the linear approximation. Because GBLA not...
The introduction of the European Directive on Measuring Instruments (MID), on 2004, has revolutionized the issue of the calibration and the traceability of the electrical energy meters. The MID imposes to calibrate the active energy meters accounting for real electromagnetic environments with peculiar disturbances. In many countries of the European Union, this factor has opened important economic...
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