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In this paper, a technique for extracting the Taylor series expansion coefficients of a varactor reactive nonlinearity is presented. A single diode and a dual-device antiseries (back-to-back cathode) combination have been characterized, aimed to accurately control their contribution to the residual intermodulation distortion (IMD) appearing in load-modulated power amplifiers (PAs). A test set-up for...
In this paper, polar transmitter concepts for high-efficiency linear power amplifiers are applied to phase conjugating arrays, with the goal of improving spectral efficiency and linearity in full-duplex communications. The nearly linear control of the drain biasing voltage over the conversion characteristic of an active gate mixer is used to overcome the highly nonlinear AM-to-AM conversion characteristic...
In this paper, two vector nonlinear characterization procedures are presented, aimed at improving available GaN HEMT models for an accurate reproduction of the device behavior operating as a current source and in switched-mode RF power amplifiers. In the case of the more traditional linear amplifying classes, a technique for simultaneously extracting the higher order derivatives of the Ids(Vgs), Igs(Vgs)...
In this paper, a phase conjugating antenna with amplitude shift keying (ASK) modulation capability is presented for its use in retrodirective arrays. A dual-gate FET resistive mixer is integrated with a slot coupled square patch, and a data signal is applied to the second gate terminal in order to amplitude modulate the device time-varying output conductance. Measurements of the response signal in...
This paper presents a cost effective solution for remote radiofrequency temperature sensing, taking advantage of a Schottky junction nonlinear characteristic and the device integration in a properly designed dual-frequency radiator. Once the proposed integrated active antenna is interrogated with a CW excitation, the level and phase of the third harmonic response signal gives information of the tag...
In this paper, a simple experimental procedure for extracting the Igs(Vgs) Taylor-series coefficients along a load line is presented, as a way to accurately characterize its contribution to FET large-signal intermodulation distortion (IMD) behaviour
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