Design And Research Of Millimeterwave Phase Shifter Based On Silicon Technology

This thesis firstly introduces the basic theory of large-scale phased-array system based on the one-dimensional uniformly distributed linear array,and introduces beamforming algorithms such as window function weighting method,zero-notch filtering method and adaptive beam optimization method.The RF,Digital,IF/BB,LO and Hybrid beamforming architectures are analyzed and compared.The isolation between channels in the phased-array on the array factor and the influence of phase and amplitude control module with RMS error on the performance of phased-array are studied.For the silicon-based device model and physical structure,the equivalent circuit of passive capacitor,inductor and transistor are analyzed,and the temperature characteristics of switch transistor are explained by P-N junction diffusion theory.Adding the parasitic parameter Coff of the transistor,a complete low-pass network model is established,and the phase equation of Ls and Cp in the millimeter-wave band are corrected based on this.For switch-type phase shifter(STPS),in the Ka-band 6bit digital phase shifter,the temperature characteristics are measured at temperature of-55?85?,which verified the theoretical analysis.In the W-band phase shifter design,a temperature compensation structure based on transistor parasitic capacitance and a step-by-step coding method are proposed,which improve the phase accuracy and temperature robustness of the highprecision phase shifter.The measurement results show that the RMS phase error is less than 4°,and the amplitude error is less than 1dB,which covers from-55? to 85?.For vector modulation phase shifter(VMPS),in the E-band phase shifter,a twostage fully differential broadband quadrature hybrid based on transformer coupling is proposed,and the amplitude balance bandwidth is extended to 65-80 GHz with only5.9dB insertion loss.The improved Gilbert variable gain amplifier(VGA)is used to improve the linearity.An active temperature compensation bias circuit is introduced into the current weighted distribution DAC controller,thereby improving the additional amplitude error and at the same time compensate the deterioration of the gain at high temperature.The EM simulation results show that the RMS phase and amplitude error is less than 1.4°and 0.5dB.and the insertion loss is-5±0.8dB in the 90 phase shift range.