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• W2559362242 abstract "Phased array systems are spreading a lot in these years due to their higher performances respect to a single antenna. These systems have been progressively more and more employedin many fields such as satellite communications, high data rate links (emerging 5G technology), military and automotive radars. Initially they where only used for military applicationsdue to their higher costs and complexity. Thanks to the technology development and the researchers efforts, these days it is possible to integrate on the same chip an entire phased array system, leading to a drastic cost reduction. The explosive growth of the applications that use the phased array approach is the motivation behind this thesis, which deals with the analysis and design of high performance building blocks for phased array systems. The first part of this work gives a brief introduction on the phased array systems illustrating the working principle, the main tasks and issues of the design related to the need for high resolution and directivity of the antennas array. The second part of the thesis is dedicated to the analysis and design of building blocks for phased array systems. More in detail, the design of VGA (variable gain amplifier) and VCO (voltage controlled oscillator) will be described. VGAs are very important in the whole system because they are responsible for the array directivity and precision in the beam forming. The impact of the VGA performance impact on the phased array functionality is hence treated and analyzed. The phase behavior when the gain setting is changed is analyzed and discussed in depth. The aim of the design is to keep the phase of the signal constant for all the gain range variation in the frequency band of the amplifier. Several phase error compensation techniques have been studied and implemented. Some X -Band SiGe VGA have been realized and measured. The performance in terms of phase error as the gain is varied out-performs the state-of-the-art. In addition to X -Band applications, some work on the upcoming 5G Communication Network has been done. A Wide Band (15 − 40 GHz) Variable Gain Amplifier has been prototyped in SiGe BiCMOS technology and a 28 GHz VGA has been implemented in a 40 nm CMOS Technology. The VCO is the other fundamental building block that we take into consideration in this thesis. In this case, we focus our attention on the phase noise, a crucial parameter that is directly related to the performance of the phased array system. An in-depth analysis on the minimization of the phase noise has been done and some K-band (i.e. 18-27 GHz) VCOs have been realized in a SiGe bipolar technology. The VCOs feature a phase noise as low as -137 dBc/Hz at 10 MHz offset from the carrier. This result out-performs the state of the art if compared to other Silicon K-band Silicon-based VCOs. Only VCOs implemented using compound semiconductor technologies show better performance in terms of phase noise. However the technology cost is in this case, dramatically higher. The work shows the feasibility of realizing high performance building blocks for phase array systems in Silicon technology. The possibility to integrate an entire phased array system on the same chip leads to a drastic cost reduction, overcoming the barrier that has stopped the development of this approach for several applications for many years. This a is crucial point for the development of next generation high data rate communication links and high precision automotive and military radars." @default.
• W2559362242 created "2016-12-08" @default.
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• W2559362242 date "2016-01-24" @default.
• W2559362242 modified "2023-09-27" @default.
• W2559362242 title "Analysis and design of high performance building blocks for phased array system in BiCMOS technology" @default.
• W2559362242 hasPublicationYear "2016" @default.
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