【摘要】：隨著電子技術(shù)的飛速發(fā)展,衛(wèi)星通信技術(shù)越來越深入到社會(huì)各領(lǐng)域。中頻收發(fā)通道作為衛(wèi)星通信中頻接收機(jī)的重要組成部分,正在朝著高中頻、大動(dòng)態(tài)范圍、高靈敏度、高線性度以及高分辨率的方向發(fā)展。本文針對(duì)衛(wèi)星通信140MHz中頻收發(fā)通道的實(shí)際需求,首先通過對(duì)各種接收通道、發(fā)射通道的方案比較,確定了本文的中頻收發(fā)通道方案,然后對(duì)本文涉及到的收發(fā)通道的工作原理及關(guān)鍵功能部件進(jìn)行深入分析,在此基礎(chǔ)上應(yīng)用ADS(Advanced Design System)仿真分析結(jié)合實(shí)際調(diào)試,完成了電路研制。本文的140MHz收發(fā)通道要求接收通道接收頻率為140MHz±5MHz、功率為-30dBm~60dBm信號(hào),并產(chǎn)生頻率14.96MHz±5MHz、功率0dBm±1dB的中頻信號(hào);并要求發(fā)射通道將25MHz±5MHz、0dBm±1dB的調(diào)制信號(hào)上變頻到140MHz±5MHz,以-20dBm±1dB的功率輸出。本文主要包含以下內(nèi)容:一、接收通道采用超外差方案并結(jié)合壓控增益放大電路的應(yīng)用,在輸入信號(hào)頻率為140MHz±5MHz、功率為-30dBm~-60dBm大動(dòng)態(tài)范圍時(shí),實(shí)現(xiàn)了輸出信號(hào)功率平坦度在9.96MHz~19.96MHz小于1dB的設(shè)計(jì)要求;二、對(duì)接收通道中各功能部件的噪聲系數(shù)以及級(jí)聯(lián)噪聲系數(shù)進(jìn)行計(jì)算分析,實(shí)現(xiàn)了接收通道的低噪聲設(shè)計(jì);三、根據(jù)發(fā)射通道要求,設(shè)計(jì)了兩路輸出均為140MHz±5MHz、-20dBm±1dB信號(hào)的發(fā)射通道;四、對(duì)電路進(jìn)行測(cè)試,測(cè)試結(jié)果表明在小信號(hào)(-60dBm)輸入時(shí),接收通道噪聲系數(shù)為3.5dB,大信號(hào)(-30dBm)輸入時(shí)接收通道噪聲系數(shù)為9.8dB,滿足本設(shè)計(jì)低于10dB的要求。其他測(cè)試指標(biāo)也都滿足設(shè)計(jì)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 鹵5 MHz, power is-30dBm~60dBm signal, and generate the intermediate frequency signal of frequency 14.96MHz 鹵5 MHz, power 0dBm 鹵1dB; The transmission channel is required to convert the modulation signal of 25MHz 鹵5MHz ~ 0 dBm 鹵1dB to 140MHz 鹵5MHz, and the output power is -20dBm 鹵1dB. The main contents of this paper are as follows: 1. When the input signal frequency is 140MHz 鹵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 鹵5MHz-20dBm 鹵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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN927.2

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