Design And Realization Of An Ultra-wideband Chaotic Signal Source

In today's society,the vigorous development of communication technology and Internet of Things technology puts forward high requirements on the power and working bandwidth of the signal source.Driven by market demand,ultra-wideband communication has once again become a hot topic of current research.Ultra-wideband chaotic signal has the advantages of large bandwidth,low delay,high quality,strong anti-interference ability,and increases the confidentiality and anti-interception of the ultra-wideband communication system,and helps to improve the information rate of the system.It is an ultra-wideband signal excellent choice of source.Ultra-wideband chaotic signal source is an active module at the transmitting end of ultra-wideband communication,and its wideband and signal quality directly affect the performance of the entire transmitting system.Therefore,its generation method is a key issue in ultra-wideband chaotic communication.Research on high-performance ultrawideband chaotic signal sources is a necessary work to improve the quality of ultra-wideband chaotic communication systems and increase the diversification of ultra-wideband signal sources.According to the IEEE 802.15.4a standard,this article first designs the circuit from the perspective of circuit theory,then uses EDA software to implement circuit simulation design,layout design,and finally tape out and test.The main work and innovations are as follows:(1)A new type of board-level two-stage chaotic circuit was designed to achieve a board-level ultrawideband chaotic signal with a bandwidth of 0.5GHz-8GHz,power consumption <80m W,and an overall signal amplitude greater than-60 d Bm in the band,which verified the circuit structure Feasibility has laid the foundation for the realization of chip-level chaotic circuits.(2)Based on the 0.35?m In Ga P/Ga As HBT process,the selection method of bipolar transistors was systematically analyzed,and the performance parameters of MIM capacitors and octagonal inductors were qualitatively analyzed,and the high-frequency equivalent circuits of passive devices were fitted.From the component parameters Considering the Q value,a device optimization method suitable for this design is proposed.(3)A new two-stage ultra-wideband chaotic oscillator structure is proposed.The emitter follower is used as the output pole of the circuit,and the collector inductance is used as the main component to increase the bandwidth of the high-frequency chaotic signal.Low problem,to achieve a larger bandwidth chaotic signal output.(4)Combining the above design and research,this paper designs a MMIC suitable for ultra-wideband chaotic communication based on 0.35?m gallium arsenide process.The chip area is1000?m*1000?m,the signal bandwidth is 0.5-8.5 GHz,and the circuit power consumption is less than 50 milliwatt which meets the design index requirements and realizes the signal source requirements of ultra-wideband chaotic communication.The ultra-wideband chaotic oscillator chip designed in this paper can be flexibly used in ultrawideband communication scenarios,and the research results have certain reference value in the field of ultra-wideband chaotic communication.