University of Twente Student Theses


Design and Calibration of a 4 Channel Programmable Phase Shifter (2-6GHz)

Battistig, R.C.M. (2018) Design and Calibration of a 4 Channel Programmable Phase Shifter (2-6GHz).

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Abstract:Modern day high frequency phase shifters are often limited in bandwidth, as the phase delays implemented in classical phase shifter architectures are inherently frequency dependent. Furthermore, these phase shifters often lack in linearity and phase resolution. A design is presented of a 4-channel phase shifter with high linearity and a simulated phase resolution of 2°, operating at frequencies of (2-6)GHz. The design overcomes the classical phase shifter issues of bandwidth limitations by opting for an In-phase-Quadrature (I-Q) architecture, utilizing higher bandwidth components. Implementation of 7-bit attenuators with a minimal attenuation step of 0.25dB allows the system to overcome systematic phase inaccuracies. Notably, the model proposed in this work does not take into account other inaccuracies besides the systematic phase and amplitude imbalance of the components, however is adjustable if a better uncertainty estimation is made. The theory behind this calibration is explained and can be used for different design situation of an I-Q based phase shifter. The dependence of maximum phase error and the minimal attenuation step of the system is mathematically estimated, using numerical analysis this relationship was proven to hold for all attenuation steps tested. For this system's attenuation step (0.25dB) the maximum phase error is ±0.87° .
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:50 technical science in general
Programme:Electrical Engineering BSc (56953)
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