Research And Design Of UWB Positioning System And RF Phase Shifter

FMCW (Frequency Modulation Continuous Wave), as a hot spot in the application of millimeter-wave radar technology, has been researched and widely used in recent years. Among the important passive components, including power splitters / combiners, phase shifters and balun circuits, the performance of their work to a large extent determine the performance of the entire circuit system. It is very important to improve the performance of passive components in frequency-modulated continuous wave radar receiver, to improve circuit performance, reduce cost and reduce the complexity of circuit. Based on the background of this development, the analysis and implementation of 77 GHz FM CW radar front-end passive components under the Si-Si process is started,The concrete results of this paper are as follows:First, a miniaturized Wilkinson power synthesizer based on lumped components was designed with 130nm SiGe BiCMOS process. The circuit area was 0.389×0.257mm2, the operating frequency was 38.5 GHz,the insertion loss was about 0.5 dB at 38.5 GHz, less than 0.65 dB in the 40 GHz band, the return loss of input port is more than 10 dB in the 0 -48 GHz while that is more than 10 dB in the 0 - 55 GHz at the output port,the isolation of output port is more than 10 dB at frequencies greater than 25 GHz.Second, based on the 130nm SiGe BiCMOS process, the design of the balun circuit at the front end of the FMCW radar receiver has an insertion loss of about 4.5 dB at 77 GHz and the phase difference is equal to 180°between the two differential ports in the 0-100 GHz.Third, a phase shifter with CRLH structure is designed based on a 130nm SiGe BiCMOS process, in which the zero phase shift point is moved by using a variable inductor based on a transformer, the operating frequency is 24 GHz. The circuit area is 0.248x0.337mm2. When the voltage is changed from 0 to 3 V, the return loss is slightly less than 10 dB at 0V. The return loss of the input port is more than 10 dB in the 13-30 GHz. The frequency range is from 15 to 26 GHz when the insertion loss is below 1 dB at 0V and 15 to 30 GHz for other voltage values. The phase shift on the degree of 0-20° when voltage varies from 0 to 3V at 24 GHz.Forth, the algorithm of UWB positioning system is studied and the positioning demonstration system is realized.