Research And Design Of Millimeter-wave Mixers Based On The 130nm CMOS Technology

As symbolic products of intelligent modern society,driverless cars have created a huge wave of changes in the automotive industry,and automotive radar is the key to ensuring the stability and safety of driverless driving.Millimeter-wave radar has become the development trend of today's automotive radar with its small size,high spatial resolution and superior anti-interference ability.At the same time,with the development of silicon-based CMOS technology,its characteristic frequency and device speed continue to increase,making it possible to design small,lightweight,low-cost millimeter-wave automotive radar chips.This thesis mainly studies the mixer of the 24GHz CMOS short-range radar transceiver chip in millimeter wave.Two improved K-band CMOS mixers were designed in this thesis based on130nm RF CMOS process.Firstly,a down-conversion mixer by adopting a folded structure based on the Gilbert circuit was designed.The mixer achieved extremely high overall performance with moderate power consumption,making it ideal for24GHz radar receiver applications;secondly,a bidirectional-conversion mixer based on transformer coupling was designed.The mixer achieved good overall performance with low power consumption while achieving bidirectional frequency conversion,and is suitable for low power,low cost 24 GHz radar transceivers.A high performance K-band down-conversion mixer has been fabricated and measured as follows,when the IF was fixed at 100MHz and the mixer operated from23GHz to 25GHz,it achieved a conversion gain of 24.8dB²6.1dB and a noise figure of 7.7dB⁸.3dB under a LO power of-3dBm,the input P_1dBdB was-18.2dBm at the frequency of 24.5GHz.The circuit consumed 16.8mW at 1.5V supply voltage.A low power K-band bidirectional-conversion mixer has been fabricated and measured as follows,in down-conversion mode,when the IF was fixed at 100MHz and the mixer operated from 23GHz to 25GHz,it achieved a conversion gain of1.3dB³dB and a noise figure of 15.4dB¹9.3dB under a LO power of 2dBm,the input P_1dBdB was 0dBm at the frequency of 24.3GHz;in up-conversion mode,when the IF was fixed at 100MHz and the mixer operated from 23GHz to 25GHz,it achieved a conversion gain of-2.5dB^-1.2dB and a noise figure of 14.2dB¹6dB under a LO power of 2dBm,the output P_1dBdB was-8dBm at the frequency of 24.7GHz.The circuit consumed 10.5mW at 1.5V supply voltage.