本文選題：多級運(yùn)算放大器 + 頻率補(bǔ)償��； 參考：《北方工業(yè)大學(xué)》2015年碩士論文

【摘要】：運(yùn)算放大器是集成電路的核心模塊,廣泛應(yīng)用在數(shù)模轉(zhuǎn)換器,模數(shù)轉(zhuǎn)換器,電源管理等電路里。運(yùn)放的性能直接影響了整體電路的性能,因此,運(yùn)算放大器的設(shè)計(jì)成為當(dāng)今集成電路領(lǐng)域的熱點(diǎn)問題。 隨著集成電路技術(shù)的不斷發(fā)展,電路集成度越來越高,MOS晶體管的尺寸越來越小,使電路設(shè)計(jì)逐漸進(jìn)入深亞微米級。短溝道效應(yīng)凸顯,使得單級放大電路的本征增益減小。傳統(tǒng)的兩級運(yùn)算放大電路已經(jīng)不能滿足需求。需要采用多級級聯(lián)的方式獲得較高的電壓開環(huán)增益。但是,運(yùn)算放大器的級聯(lián)引入了額外的極點(diǎn)和零點(diǎn),影響了運(yùn)算放大器的穩(wěn)定性。因此,需要采用頻率補(bǔ)償技術(shù)保證運(yùn)算放大電路的閉環(huán)穩(wěn)定性。 本論文以傳統(tǒng)的兩級運(yùn)算放大器為例,闡述了放大器的頻率補(bǔ)償原理,介紹了幾種多級運(yùn)算放大器的頻率補(bǔ)償結(jié)構(gòu)�；赟MIC0.18μm工藝設(shè)計(jì)了一種三級運(yùn)算放大器,在提供較大直流增益的同時,增加了輸入輸出擺幅。采用了合適的頻率補(bǔ)償結(jié)構(gòu)對其進(jìn)行補(bǔ)償,仿真結(jié)果表明,本文所設(shè)計(jì)的三級運(yùn)算放大器在3.3v電源電壓下,負(fù)載為5pf電容時,直流開環(huán)增益為155dB,單位增益帶寬達(dá)到了32MHz,相位裕度為56.09。,具有較理想的頻率響應(yīng)和瞬態(tài)響應(yīng),并且所需的補(bǔ)償電容值較小,優(yōu)化了芯片的面積,較容易在CMOS工藝下實(shí)現(xiàn)。增益和相位裕度均滿足設(shè)計(jì)要求。
[Abstract]:Operational amplifier is the core module of integrated circuit. It is widely used in digital-to-analog converter, A / D converter, power management and so on. The performance of operational amplifier directly affects the performance of the whole circuit. Therefore, the design of operational amplifier has become a hot issue in the field of integrated circuit. With the development of integrated circuit technology, the size of MOS transistor becomes smaller and smaller, which makes the circuit design gradually enter deep sub-micron level. The short channel effect is prominent, which reduces the intrinsic gain of single stage amplifier. The traditional two-stage operation amplifier can not meet the demand. High voltage open loop gain is needed by multistage cascade. However, the cascade of operational amplifiers introduces additional poles and zeros, which affects the stability of operational amplifiers. Therefore, frequency compensation technique is needed to ensure the closed-loop stability of the operational amplifier. This paper takes the traditional two-stage operational amplifier as an example, expounds the principle of frequency compensation of amplifier, and introduces several kinds of multi-stage operational amplifier's frequency compensation structure. Based on SMIC0.18 渭 m process, a three-stage operational amplifier is designed, which not only provides a large DC gain, but also increases the input and output swing. The simulation results show that the three-stage operational amplifier designed in this paper is loaded with 5pf capacitor at 3.3v power supply voltage. The DC open-loop gain is 155dB, the unit gain bandwidth is 32MHz, the phase margin is 56.09.It has ideal frequency response and transient response, and the compensation capacitance is small. The area of the chip is optimized and it is easy to realize in CMOS process. Both gain and phase margin meet the design requirements.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN722.77

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本文編號：1923048