Design of a High-precision CMOS Active Phase Shifter for 76-81 GHz
This study introduces a high-precision,low-noise active vector synthesis phase shifter based on the TSMC 40 nm CMOS process to achieve a low-cost,high-performance millimeter-wave automotive radar.It operates over a frequency range of 76-81 GHz with a phase-step of 5.625°.An RC-RL two-stage multi-phase filtering structure is adopted,generating stable quadrature signals without introducing excessive insertion loss.A pre-amplifier circuit is added in front of the multi-phase filter to enhance the overall gain and reduce the noise coefficient.The design integrates a digital-to-analog converter(DAC)to control the tail current of the vector synthesis module,thereby achieving high-precision phase shifting.As the phase resolution is determined by the DAC's resolution,the size and insertion loss of the phase shifter are not affected by its control resolution.Suitable parameter models and topological structures were selected to optimize the circuit performance and layout.Simulation results showed that within the frequency range of 76-81 GHz,the RMS phase error is＜2.1°,average gain＞1.7 dB,RMS gain fluctuation＜0.5 dB,noise coefficient＜9.5 dB,power consumption is 15.7 mW,and 1 dB gain compression point is＞-7 dBm.This active phase shifter exhibits high precision,low-cost,and low power consumption characteristics,with a lower noise coefficient and higher gain compared with conventional active phase shifters.
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