140MHz中频收发通道硬件电路研究与实现
发布时间：2018-12-11 15:31
【摘要】：随着电子技术的飞速发展,卫星通信技术越来越深入到社会各领域。中频收发通道作为卫星通信中频接收机的重要组成部分,正在朝着高中频、大动态范围、高灵敏度、高线性度以及高分辨率的方向发展。本文针对卫星通信140MHz中频收发通道的实际需求,首先通过对各种接收通道、发射通道的方案比较,确定了本文的中频收发通道方案,然后对本文涉及到的收发通道的工作原理及关键功能部件进行深入分析,在此基础上应用ADS(Advanced Design System)仿真分析结合实际调试,完成了电路研制。本文的140MHz收发通道要求接收通道接收频率为140MHz±5MHz、功率为-30dBm~60dBm信号,并产生频率14.96MHz±5MHz、功率0dBm±1dB的中频信号;并要求发射通道将25MHz±5MHz、0dBm±1dB的调制信号上变频到140MHz±5MHz,以-20dBm±1dB的功率输出。本文主要包含以下内容:一、接收通道采用超外差方案并结合压控增益放大电路的应用,在输入信号频率为140MHz±5MHz、功率为-30dBm~-60dBm大动态范围时,实现了输出信号功率平坦度在9.96MHz~19.96MHz小于1dB的设计要求;二、对接收通道中各功能部件的噪声系数以及级联噪声系数进行计算分析,实现了接收通道的低噪声设计;三、根据发射通道要求,设计了两路输出均为140MHz±5MHz、-20dBm±1dB信号的发射通道;四、对电路进行测试,测试结果表明在小信号(-60dBm)输入时,接收通道噪声系数为3.5dB,大信号(-30dBm)输入时接收通道噪声系数为9.8dB,满足本设计低于10dB的要求。其他测试指标也都满足设计要求。
[Abstract]:With the rapid development of electronic technology, satellite communication technology is more and more deep into various fields of society. As an important part of if receiver in satellite communication, if transceiver is developing towards high frequency, large dynamic range, high sensitivity, high linearity and high resolution. This paper aims at the actual demand of the 140MHz if transceiver channel in satellite communication. Firstly, by comparing the schemes of various receiving channels and transmitting channels, the if transceiver channel scheme of this paper is determined. Then, the working principle and key functional components of the transceiver channel involved in this paper are deeply analyzed. On this basis, the circuit is developed by using ADS (Advanced Design System) simulation analysis combined with actual debugging. The 140MHz transceiver channel in this paper requires that the receiving channel receive frequency 140MHz 卤5 MHz, power is-30dBm~60dBm signal, and generate the intermediate frequency signal of frequency 14.96MHz 卤5 MHz, power 0dBm 卤1dB; The transmission channel is required to convert the modulation signal of 25MHz 卤5MHz ~ 0 dBm 卤1dB to 140MHz 卤5MHz, and the output power is -20dBm 卤1dB. The main contents of this paper are as follows: 1. When the input signal frequency is 140MHz 卤5MHz and the power is in the large dynamic range of 30dBm~-60dBm, the receiving channel adopts the scheme of superheterodyne and the application of voltage-controlled gain amplifier circuit. The power flatness of output signal is less than that of 1dB in 9.96MHz~19.96MHz. Secondly, the noise coefficient and cascade noise coefficient of each function part in the receiving channel are calculated and analyzed, and the low noise design of the receiving channel is realized. Thirdly, according to the requirements of the emission channel, two emission channels with 140MHz 卤5MHz-20dBm 卤1dB signal output are designed. Fourthly, the circuit is tested. The test results show that the noise coefficient of the receiving channel is 3.5 dB when the input is small signal (- 60dBm), and the noise coefficient of the receiving channel is 9.8 dB when the large signal (- 30dBm) is input, which meets the requirement of this design lower than that of 10dB. Other test indicators also meet the design requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN927.2
本文编号：2372791
[Abstract]:With the rapid development of electronic technology, satellite communication technology is more and more deep into various fields of society. As an important part of if receiver in satellite communication, if transceiver is developing towards high frequency, large dynamic range, high sensitivity, high linearity and high resolution. This paper aims at the actual demand of the 140MHz if transceiver channel in satellite communication. Firstly, by comparing the schemes of various receiving channels and transmitting channels, the if transceiver channel scheme of this paper is determined. Then, the working principle and key functional components of the transceiver channel involved in this paper are deeply analyzed. On this basis, the circuit is developed by using ADS (Advanced Design System) simulation analysis combined with actual debugging. The 140MHz transceiver channel in this paper requires that the receiving channel receive frequency 140MHz 卤5 MHz, power is-30dBm~60dBm signal, and generate the intermediate frequency signal of frequency 14.96MHz 卤5 MHz, power 0dBm 卤1dB; The transmission channel is required to convert the modulation signal of 25MHz 卤5MHz ~ 0 dBm 卤1dB to 140MHz 卤5MHz, and the output power is -20dBm 卤1dB. The main contents of this paper are as follows: 1. When the input signal frequency is 140MHz 卤5MHz and the power is in the large dynamic range of 30dBm~-60dBm, the receiving channel adopts the scheme of superheterodyne and the application of voltage-controlled gain amplifier circuit. The power flatness of output signal is less than that of 1dB in 9.96MHz~19.96MHz. Secondly, the noise coefficient and cascade noise coefficient of each function part in the receiving channel are calculated and analyzed, and the low noise design of the receiving channel is realized. Thirdly, according to the requirements of the emission channel, two emission channels with 140MHz 卤5MHz-20dBm 卤1dB signal output are designed. Fourthly, the circuit is tested. The test results show that the noise coefficient of the receiving channel is 3.5 dB when the input is small signal (- 60dBm), and the noise coefficient of the receiving channel is 9.8 dB when the large signal (- 30dBm) is input, which meets the requirement of this design lower than that of 10dB. Other test indicators also meet the design requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN927.2
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