Research On A Ultra-wideband Pulse-signal Receiver

Ultra-wideband technology has many characteristics such as fast transmission rate,large channel capacity,good transmission performance,high reliability,low power consumption and small structure,so it is paid more and more attention and research.But the bandwidth of ultra-wideband signal is relatively wide,so the performance requirements of the circuit is relatively high,the circuit design is also more complex.At the same time,the ultra-wideband signal in the time domain for the width of the picosecond narrow pulse signal,for this picosecond narrow pulse signal,the current analog/digital converter is difficult to achieve effective sampling.This paper will address these problems,the ultra-wideband pulse signal receiver system to study.This paper first briefly introduces the development history of UWB technology,and introduces the characteristics and application prospect of UWB technology.Then,the characteristics of UWB pulse signal are introduced with Gaussian pulse signal as an example,and the basic principle of UWB pulse signal receiver-Synchronous Clock Sampling is introduced in detail;At the same time,the main contents of this paper,including sampling gate,ultra-wideband pulse signal source,ultra-wideband balun,ultra-wideband low noise amplifier and other key parts.Then,the design method of several key devices in the receiver is introduced,and several different design schemes are given and their advantages and characteristics are analyzed.According to the comparison and analysis of the sampling gates of different structures,the circuit structure of the bridge sampling gate is selected,and a sampling gate circuit can be designed with the good sampling performance for the ultra wideband signal with 250 ps pulse width or within the 5GHz bandwidth;According to the analysis and comparison of several UWB pulse signal generation schemes,the step recovery diode is selected to generate the narrow pulse in the time domain.Two ultra wideband pulse source circuits with pulse width of 650 ps and 500 ps are designed respectively,and the bandwidth of the two pulse signals can reach 2.2GHz and 2.9GHz respectively;According to the analysis of the advantages and disadvantages of different structures,this paper uses the structure of Marchand Balun to optimize the simulation using HFSS to design an ultra-wideband balun with a working frequency of 0.5-5.5GHz.The input return loss of the balun is greater than 10 dB,the amplitude imbalance is less than ±0.2dB,the phase imbalance is less than ±2°;According to the introduction and analysis of different structure ultra-wideband low noise amplifier,an ultra-wideband low noise amplifier is designed with parallel negative feedback structure.The noise figure is less than 0.8dB in the frequency range of 0.3-5GHz,and the power gain can be up to 10 dB,gain flatness of about 2d B,the return loss of each port are greater than 12 dB.Finally,the receiver system,respectively,the various parts of the test,debugging,and build the entire receiver circuit to meet the design requirements.In this paper,the ultra-wideband pulse signal receiver can be in the 0.5-5GHz band,to achieve the ultra-wideband pulse signal reception.In the future study of ultra-wideband pulse signal receiver,we can be improved on the basis of this article,so that it can work in a wider frequency band.