Investigations On Key RF Technologies For Asymmetric Array And Millimeter Wave Chip Measurement Platform

With the large-scale deployment and commercialization of the fifth-generation(5G)mobile communication technology,the exploration of new frequency bands and new technologies for B5G/6G mobile communication has gradually become the key research direction of various research institutions and international organizations.Due to the inherent limitations of the millimeter wave,the new generation of mobile communications is facing a quantity of problems and challenges.This paper studies a novel technology for the millimeter wave with digital-multibeam—Asymmetric Array,and also discusses many issues in the direction of the millimeter wave chip measurement auxiliary platform.The main research contents and innovations of this article are as follows:First of all,this paper designs and implements the single-module evaluation board of each selected chip for the RF transceiver channel.The design and optimization of auxiliary circuits and debug process ensures the best performance of each module.Also,this paper focuses on the passive components(like the filter,and the phase shifter)and carries out new design methods and optimization,and got good test results.Then,due to the advantages of the Digital-Multibeam Asymmetric Array,such as low cost,high gain,good search capability,and low transmition delay,this paper designs a4-Transmiter and 1-Receiver Digital-Multibeam Asymmetric Array operating in millimeter wave.The test results show that the four transmitting channels of the Asymmetric Array can realize the transmission of a power range of-10 d Bm ? 30 d Bm in the frequency band of24.25?29.5GHz with 400 MHz signal bandwidth.The single link gain is 28.5d B,with 4.97 d B overall flatness and high consistency between channels.The IIP3 is +25d Bm,which means the transmit output can be up to +33d Bm with high linearity.The in-band and out-of-band image-suppression and spurious-suppression performance are good.The best performance of EVM with 50 Msps code rate and 256 QAM modulation is 0.59%rms;Best ACPR performance is-49.1d Bc.The asymmetric receiving channel can receive signals in the power range of-85 d Bm ?-25 d Bm in the 24.25?29.5GHz frequency band,with a gain of 30 d B,and a flatness of 1.27 d B;IIP3 is-20 d Bm,the receiving output is up to-10 d Bm,and the linearity is high;in and out of band Image suppression and spurious performance are good;best single channel 50 Msps code rate 256 QAM EVM is up to 0.66%;channel ACPR is-44.2d Bc.Finally,this paper designs a scalable and portable millimeter wave chip measurement platform.The results are as follows: Designed an excellent performance frequency synthesizer with working range of 4.75?9.75 GHz,output phase noise of-104.3d Bc/Hz@1KHz,-108.9d Bc/Hz @10KHz,-105.2d Bc/Hz @100KHz,-134.8d Bc/Hz@1MHz and-151.2d Bc/Hz @10MHz and output power of-5d Bm.It also realizes to be a high-performance transmitter channel operating in 24.25?29.5GHz with the power range of-23 d Bm ? +7d Bm,and gain of 11 d B,with 4.34 d B flatness;the channel IIP3 is +16d Bm,which means that the output can be up to +7d Bm with high linearity;the in-band and out-of-band image-suppression and spurious-surpression performance is good;the best performance of 256 QAM modulated EVM under single channel 50 Msps code rate is0.99%rms;the best ACPR is-43.9d Bc.At the same time,the receiver can receive signals in24.25?29.5GHz,with a power range of-85 d Bm ?-25 d Bm,and gain of 28 d B,with 5.13 d B flatness;the channel IIP3 is-22 d Bm,and the output is up to-14 d Bm,with high linearity;and good internal or external image-suppression and spurious-surpression performance;the best performance of 256 QAM modulation EVM under single channel 50 Msps code rate is0.65%rms;the best ACPR is-43.8d Bc.