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This paper presents the linearization of a polar transmitter for EDGE applications. The methodology used, complements the modulation of drain bias, vDD(t) with a proper variation of the input drive level, vg(t). It is believed to improve the linearity, while maintaining the efficiency of such transmitters.
In this letter, a phase conjugator for full-duplex retrodirective arrays is presented. Properly controlling a PHEMT nonlinear behavior, the modulation of the phase conjugated retransmitted signal is assured without distorting the information contained in the amplified version of the received signal. By means of a balanced architecture, the interrogating and response components are obtained through...
This paper presents two frequency converting PHEMT-based active antennas to be used in RFID applications. A proper characterization of the transistor nonlinear behavior revealed the existence of two biasing regions where the response signal, the second harmonic or the IF component, can be generated with maximum conversion gain and phase opposition. This attractive issue has been taken advantage of,...
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