| The development and marketization of 5G communication,6G communication,vehicle-mounted radar and other technical fields have put forward new design requirements for RF millimeter wave integrated circuits.Large bandwidth and high linearity are the hot research directions in the RF field.As an important part of the millimeter wave transceiver,it has become an urgent problem to design a broadband and high-linearity mixer to cope with different application.Firstly,this thesis summarizes the basic knowledge of RF circuit and mixer.A method of modeling and analyzing MOSFET’s port impedance and passive balun balance is proposed.And broadband matching strategy and balance optimization strategy for passive balun are given.The working principle,classification,influencing factors of the performance and main optimization technologies of mixer are analyzed.The advantages and disadvantages of current multi-band and broadband frequency conversion strategies are summarized.In order to solve the problem of ultra-wideband IF design,the active balun is used as the output circuit in this thesis,which can get good matching performance in 5～10GHz IF frequency band,while saving area very much.This broadband technology is applied to the E-band downconverter module.According to the test results,the power gain of this mixer is-2.64 d B,IP1 d B is-10.19 d Bm.The IF output matching is good,S22 is-2.48 d B,and the LO isolation is 62.67 d Bc.In addition,a four-channel transceiver chip based on power division multiplexing technology is designed and processed.The E-band application also face the design requirements of high linearity.In the76～81GHz millimeter wave vehicle-mounted radar application,the down-conversion mixer is required to be able to support the signal with large power.For this reason,the dual-balanced passive mixer core and PMOS common-source amplifier are connected in series.The cascode driving amplifier is introduced at the LO port to improve the module linearity.The temperature compensation bias circuit is designed using triodes and diodes.According to the post-layout simulation results,this down-conversion mixer achieves18.15 d B of voltage gain,-5.58 d Bm of IP1 d B,10.1d B of noise figure,52.2k Hz of flicker noise transfer frequency,and could work in the temperature range of-40～125℃.The multi-band problem in broadband applications will further increase the design difficulty.The 5G millimeter wave dual-band system needs to be capable of processing two sets of broadband RF signals near 27 and 39 GHz.For this reason,this thesis proposes two mixer technologies,which can correspond two RF frequency points with one LO and IF frequency point,reducing the bandwidth of IF and LO.And the image frequency is out of RF band.The down-conversion mixer uses the differential mode common mode extraction technology,and the up-conversion mixer uses the amplification and mixing switching technology.In addition,a four-channel 5G dual-band receiver is designed.The receiver includes a dual-mode down-conversion mixer.Each channel of the receiver can achieve 6bit amplitude and phase control,and the inter-channel amplitude and phase calibration module is integrated.In the measurement result,the receiver gain is 19.2d B,the image rejection is 43 d Bc,and the noise figure is 8.4d B. |
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