本文選題：光纖通信 + 光接收機�。� 參考：《武漢大學(xué)》2017年碩士論文

【摘要】：現(xiàn)代化進程的不斷發(fā)展,人們對通訊的要求越來越高,不但要求通信速率越來越快,傳輸?shù)木嚯x也越來越遠,通信容量也越來越大。傳統(tǒng)的電線傳輸損耗大且容量較小,已經(jīng)不能滿足互聯(lián)網(wǎng)時代的要求。光纖通信以通信帶寬寬,傳輸容量大,傳輸距離遠和抗外界干擾性強等優(yōu)勢迅速崛起。近年來,光纖到戶,芯片內(nèi)互聯(lián),局域網(wǎng),光網(wǎng)絡(luò)等已經(jīng)走入人們的日常生活,大大改善了生活質(zhì)量。在光纖通信系統(tǒng)中,前置放大器是光接收機前端放大電路中最為重要的組成部分。本課題采用的是55nm_CMOS工藝,設(shè)計通信速率為2.5Gbps的高靈敏度的前置放大器,這個芯片用于光纖傳輸中國際同步數(shù)字體系的STM-16速率級。前置放大器作為光接收機第一級信號處理電路,其性能決定了整個光接收機的性能,對后級的限幅放大器和時鐘恢復(fù)電路有很大的影響,因此也是最難設(shè)計的電路,其性能指標(biāo)也是比較苛刻的。本課題設(shè)計的2.5Gbps跨阻放大器其差分跨阻增益為40kΩ,等效輸入積分噪聲電流為96nA,低頻截止頻率為20KHz,高頻截止頻率為1.85GHz,靈敏度為-30.2dBm,動態(tài)輸入范圍為30dB,輸入飽和光電流為2mA,電源功耗電流為36.2mA,整個芯片采用3.3V標(biāo)準(zhǔn)電源電壓供電。整個前置放大器采用分模塊的設(shè)計理念,主要分為核心放大電路和偏置電路。核心電路主要包括輸入級,單端轉(zhuǎn)差分放大級,差分放大級,輸出緩沖級,自動增益控制模塊,輸入電流監(jiān)控模塊,光電二極管供電電壓模塊。偏置電路主要包括帶隙電路,主放供電電路和電流偏置電路。其中輸入級是將輸入的光電流轉(zhuǎn)換成電壓,供給后級信號的處理;單端轉(zhuǎn)差分放大級是將輸入級產(chǎn)生的單端電壓轉(zhuǎn)換成差分電壓輸出,以方便和后級連接;差分放大級主要將電壓信號進一步放大處理,并且可以驅(qū)動輸出緩沖級;輸出緩沖級主要是驅(qū)動后級的50歐姆負載,要提供大的輸出幅度,以避免電磁干擾;帶隙電路主要提高一個與溫度無關(guān)的電壓和一個與溫度成正比的電流;主放供電電路主要是將帶隙電路的輸出電壓轉(zhuǎn)換成能夠帶負載的電壓源;電流偏置電路主要提供多路的電流輸出。
[Abstract]:With the continuous development of modernization, people are demanding more and more communication, not only the speed of communication is getting faster and faster, the distance of transmission is also more and more distant, and the capacity of communication is becoming larger and larger. Traditional wire transmission loss and capacity is small, can not meet the requirements of the Internet era. With the advantages of wide communication bandwidth, large transmission capacity, long transmission distance and strong resistance to external interference, optical fiber communication has emerged rapidly. In recent years, fiber to home, chip interconnection, local area network, optical network and so on have entered people's daily life, greatly improved the quality of life. In optical fiber communication system, preamplifier is the most important part in the front end amplifier circuit of optical receiver. In this paper, 55 nm CMOS technology is used to design a high sensitivity preamplifier with a communication rate of 2.5 Gbps. This chip is used in STM-16 rate level of international synchronous digital system in optical fiber transmission. As the first stage signal processing circuit of optical receiver, preamplifier determines the performance of the whole optical receiver, and has a great influence on the limiting amplifier and clock recovery circuit, so it is also the most difficult circuit to design. Its performance index is also quite harsh. The 2.5Gbps transresistance amplifier designed in this paper has a differential transresistance gain of 40k 惟, an equivalent input integral noise current of 96nA, a low frequency cut-off frequency of 20kHz, a high frequency cut-off frequency of 1.85 GHz, a sensitivity of -30.2 dBm, a dynamic input range of 30 dB and an input saturation photocurrent of 30 dB. 2 Ma, the power consumption current is 36.2 Ma, the whole chip is supplied by 3.3V standard power supply voltage. The preamplifier is divided into core amplifier circuit and bias circuit. The core circuit mainly includes input stage, single-end differential amplifier stage, output buffer stage, automatic gain control module, input current monitoring module, photodiode power supply voltage module. The bias circuit mainly includes bandgap circuit, main amplifier supply circuit and current bias circuit. The input stage converts the input photocurrent into the voltage and supplies the post-stage signal processing; the single-end conversion differential amplifier stage converts the input stage's single terminal voltage into the differential voltage output to facilitate the connection with the rear stage; The differential amplifier stage mainly amplifies the voltage signal and can drive the output buffer stage, which mainly drives the 50 ohms load of the latter stage, and provides a large output amplitude to avoid electromagnetic interference. The band-gap circuit mainly increases a temperature-independent voltage and a current proportional to temperature, and the main amplifier circuit converts the output voltage of the band-gap circuit into a voltage source capable of load. Current bias circuit mainly provides multiple current output.
【學(xué)位授予單位】：武漢大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN722.71;TN929.11

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