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Diode power probe measurements of wireless signals

Gomes, Hugo; Rodríguez Testera, AlejandroAutor UVIGO; Carvalho, Nuno Borges; Fernández Barciela, MónicaAutor UVIGO; Remley, Kate A
Date: 2011-04
UNIVERSAL IDENTIFIER: http://hdl.handle.net/11093/3522
EDITED VERSION: http://ieeexplore.ieee.org/document/5696790/
UNESCO SUBJECT: 3307.08 Dispositivos de Microondas ; 3307.14 Dispositivos Semiconductores ; 3307.92 Microelectrónica. Tecnologías III-V y Alternativas
DOCUMENT TYPE: article

Abstract

In this paper, we conduct a thorough analysis of the nonlinear behavior of diode power probes and demonstrate how memory effects can alter power measurements of signals with wide modulation bandwidths and high values of peak-to-average power ratio. We show analytically, by simulations, and with measurements, that commonly used single-tone calibration procedures for diode power probes can provide erroneous values when measuring modulated signals used in many new wireless standards. We show that high values of peak-to-average-power ratio can degrade the calibration results due to the low-frequency response imposed by the power probe’s baseband circuit impedance. This effect is first theoretically demonstrated by use of a Volterra series, and then validated by simulations and measurements with a diode power probe circuit. This study provides engineers with guidelines for techniques for correction of diode power probe measurements.
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