Research And Design Of Millimeter Wave Broadband Phase Control And Correction Circuits

At present,most of the 5G millimeter wave communication FR2 bands in the world are concentrated in 24-45 GHz.In order to meet the demand of each country’s band,it is urgent to research and design an ultra-broadband phase-shifting array covering the FR2band.However,there are few studies on phase shifter broadbanding.Therefore,in this thesis,a two-stage hybrid quadrature network quadrature signal generator is studied and designed to realize the excellent performance of the phase shifter even in the large bandwidth.Considering the diversity of 5G millimeter wave communication application,the impact of temperature on the performance of phased array chips can not be ignored.At the same time,the fluctuation of supply voltage and processing errors also make the deterioration of phased array chip performance.To address the impact of these influencing factors on phased array chips,a millimeter-wave phased array amplitude and phase self-calibration circuit is studied and designed in this thesis.The correction circuit can calibrate the fluctuation of the amplitude and phase control ability of the phased array chip caused by the temperature and process errors.The two phase shifters designed in this thesis both use a vector synthesis architecture.The architecture mainly consists of an ultra-wideband quadrature signal generator,two variable gain amplifiers,and a digital-to-analog converter circuit.This thesis analyzes the phase and amplitude relationship between the output signals of the two-stage hybrid network based on the hybrid quadrature network implemented by the transformer,and ensures the amplitude consistency and phase quadrature under the large bandwidth condition by the two-synthesis of the output signals.What’s more,this two phase shifters optimize and improve the structure,the layout of the quadrature signal generator and the connection of the first and secnd stages.Finally,the two phase shifters designed in this thesis achieve high performance in the condition of large bandwidth.The first phase shifter is processed in 130nm Si Ge Bi CMOS process and works in 18-30GHz with a relative bandwidth of 50%and an area of 0.2758mm~2.The second phase shifter optimizes the size of the quadrature signal generator and improves the control logic of the variable gain amplifier to reduce power consumption compared to the first phase shifter.The work is processed in 65nm CMOS process,with an operating bandwidth of 22-45GHz,a relative bandwidth of 68.7%,and an area of 0.1647mm~2.Considering that the calibration circuit mainly serves the whole phased array transceiver chip,the area cost and the impact on the main link are the most important indicators.Therefore,in this thesis,a calibration circuit serving the 5G millimeter wave FR2 band phased array chip is designed.The circuit mainly consists of a coupler,a transformer,a power detector and an analog-to-digital convert.The coupler extracts the signal from the RF link to the transformer.Based on the sum and difference product principle,the transformer converts the phase information to amplitude of the signal.The power detector detects the amplitude of the output signal of transformer and converts the amplitude and phase information into DC voltage.The analog-to-digital conversion circuit samples the power detector output voltage into binary code and exports it to the off-chip programmable gate array.Finally,a calibration algorithm extracts the amplitude and phase information and generates a calibration code to calibrate the amplitude and phase errors of the RF link.