本文選題：低噪聲放大器 + 噪聲系數(shù)�。� 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：低噪聲放大器在無(wú)線通信、雷達(dá)、遙測(cè)遙控和電子對(duì)抗系統(tǒng)中作為接收機(jī)前端的第一級(jí)部件,其性能決定了接收機(jī)的抗噪聲特性。如今各種科技產(chǎn)品不斷更新?lián)Q代,對(duì)低噪聲、高增益、高動(dòng)態(tài)范圍、高可靠性的低噪聲放大器的需求也越來(lái)越迫切,因此,對(duì)低噪聲放大器進(jìn)行研究具有重要意義。本文首先介紹了低噪聲放大器的研究背景和發(fā)展現(xiàn)狀,列舉了國(guó)內(nèi)外幾家公司的低噪聲放大器產(chǎn)品的性能參數(shù),又介紹了低噪聲放大器理論,包括低噪聲放大器的性能指標(biāo)和設(shè)計(jì)方法,然后開(kāi)始對(duì)平衡式低噪聲放大器進(jìn)行設(shè)計(jì)、仿真、優(yōu)化、繪制版圖、加工實(shí)物、測(cè)試和調(diào)試。本文設(shè)計(jì)的低噪聲放大器的工作頻段為1.8~2.2GHz,為同時(shí)滿足對(duì)噪聲系數(shù)、增益和駐波比的要求,放大器采用平衡式結(jié)構(gòu)。與單端低噪聲放大器相比,平衡式低噪聲放大器的端口匹配比較好,能夠獲得較好的駐波比,而且放大器的動(dòng)態(tài)范圍、可靠性和穩(wěn)定性也得到提高,從而使噪聲系數(shù)得以降低�？紤]到版圖設(shè)計(jì)的難度,本設(shè)計(jì)選用分支線定向耦合器。首先設(shè)計(jì)了單級(jí)平衡式低噪聲放大器,晶體管選用AVAGO公司的ATF-54143,應(yīng)用ADS軟件對(duì)放大器的偏置電路、穩(wěn)定電路和匹配電路進(jìn)行了設(shè)計(jì),并與兩個(gè)定向耦合器相連構(gòu)成單級(jí)平衡式低噪聲放大器,經(jīng)過(guò)仿真和優(yōu)化,得到了合理的設(shè)計(jì)方案,加工實(shí)物后,經(jīng)不斷調(diào)試,最終獲得了較好的測(cè)試結(jié)果,噪聲系數(shù)小于0.7dB,增益大于15dB,輸入輸出駐波比小于1.5。為進(jìn)一步提高增益,設(shè)計(jì)了兩級(jí)平衡式低噪聲放大器,第二級(jí)驅(qū)動(dòng)放大器選用AVAGO公司的晶體管ATF-50189,通過(guò)ADS軟件對(duì)驅(qū)動(dòng)放大器的偏置電路、穩(wěn)定電路和匹配電路進(jìn)行了設(shè)計(jì),并與第一級(jí)低噪聲放大器進(jìn)行級(jí)聯(lián)仿真,最后將級(jí)聯(lián)后的放大器與兩個(gè)定向耦合器相連構(gòu)成兩級(jí)平衡式低噪聲放大器,仿真優(yōu)化后加工實(shí)物,經(jīng)過(guò)反復(fù)調(diào)試,最終測(cè)得在工作頻帶內(nèi),放大器的噪聲系數(shù)在0.67dB~0.72dB,增益為24.78dB~25.31dB,輸入輸出駐波比均小于1.5。
[Abstract]:Low noise amplifier (LNA) is the first stage of receiver in wireless communication, radar, telemetry, remote control and electronic countermeasure system. Its performance determines the anti-noise characteristics of receiver.This paper first introduces the research background and development status of LNA, enumerates the performance parameters of LNA products from several companies at home and abroad, and introduces the theory of LNA.It includes the performance index and design method of LNA, and then designs, simulates, optimizes, draws layout, processes objects, tests and debugs the balanced LNA.The operating frequency of the LNA designed in this paper is 1.8V 2.2GHz. In order to meet the requirements of noise coefficient, gain and VSWR simultaneously, the amplifier adopts a balanced structure.Compared with single-ended low-noise amplifier, the balanced low-noise amplifier has better port matching and better standing wave ratio, and the dynamic range, reliability and stability of the amplifier are also improved, so that the noise coefficient can be reduced.Considering the difficulty of layout design, this design chooses branch line directional coupler.First, a single-stage balanced low-noise amplifier is designed. The transistor is composed of ATF-54143of AVAGO Company. The bias circuit, stabilization circuit and matching circuit of the amplifier are designed by using ADS software.And connected with two directional couplers to form a single-stage balanced low-noise amplifier. Through simulation and optimization, a reasonable design scheme is obtained. After processing the material object, after continuous debugging, a better test result is obtained.The noise coefficient is less than 0.7 dB, the gain is greater than 15 dB, and the input / output standing wave ratio is less than 1.5.In order to further improve the gain, a two-stage balanced low-noise amplifier is designed. The second stage drive amplifier uses AVAGO transistor ATF-50189.The bias circuit, stabilization circuit and matching circuit of the drive amplifier are designed by ADS software.Finally, the cascade amplifier is connected with two directional couplers to form a two-stage balanced low-noise amplifier.Finally, in the operating frequency band, the noise coefficient of the amplifier is 0.67 dB ~ 0.72 dB, the gain is 24.78 dB ~ (-1) 25.31 dB, and the input / output VSWR is less than 1.5.
【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】：2015
【分類號(hào)】：TN722.3

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本文編號(hào)：1740215