Continuous non-invasive harmonic resonance detection and characterization in residential low-voltage networks
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Beschreibung
This thesis presents the analysis and design of different circuit concepts for the upcoming 5G and 60GHz wireless communications with frequencies ranging from 24 GHz to 70 GHz in K/Ka/V bands. For 60 GHz applications, a comprehensive set of active and passive circuits intended to be integrated into a 60 GHz I-Q system has been analyzed and designed in this thesis. The main research interest here consists in designing switchable circuits, which can be set to low-power standby mode at idle time to save energy. To accomplish the switching function, different switching methods have been discussed in this work. A transistor back-gate based switching method has been proposed to overcome the drawbacks associated with the conventional front-gate based switching. It was the first time that transistor back-gates were utilized for the switching task of mmW circuits. All the active circuits designed in this thesis have successfully demonstrated the back-gate capability in terms of switching by the measurements. The designed two-stage power amplifier exhibits a gain of 23.3 dB, a maximum output power of 13.6 dBm and a maximum power-added-efficiency (PAE) of 28.3%. The presented 60 GHz LNA based on the gain peaking technique achieves a broad bandwidth of 18.5 GHz. Its measured minimum noise figure is 3.3 dB. Thanks to the on-chip local oscillator (LO) driver, the 60 GHz up-conversion and down-conversion mixers presented in this work require the lowest LO power for operation compared to other designs. Two Wilkinson power combiners/dividers based on transmission lines and lumped elements have been designed and compared. The lumped element based version shows less area consumption but similar performance. For I-Q generation, a novel cross-coupled transformer-based quadrature-phase coupler has been analyzed and designed. The applied capacitive cross-coupling improves the coupler coupling coefficient, which is limited by the low magnetic coupling between the transformer windings. The primary focus of designing 5G mmW circuits in this work is investigating the feasibility of dual-band operation in the two 5G mmW band-sets – 28 GHz and 38 GHz. Two 5G dual-band designs have been investigated in this thesis, indicating the high potential of designing dual-band circuits operating in the 5G mmW band. The presented dual-band vector-sum phase shifter provides 360° of phase tuning and a gain of better than 5 dB in both 5G band-sets. A novel phase-compensated RC poly-phase-filter (PPF) has been implemented in this design. The introduced phase compensation technique reduces the effects of layout parasitics, which cause drifts in phase and amplitude responses of the RC PPF. The up-conversion mixer in this work shows its dual-band capability with competitive performance in terms of conversion gain, linearity and energy consumption.
Autor*in
Xin Xu