本文選題：低壓差穩(wěn)壓器　切入點(diǎn)：誤差放大器　出處：《哈爾濱工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著近幾年陀螺傳感器的廣泛應(yīng)用,市場(chǎng)對(duì)陀螺系統(tǒng)提出了更高的指標(biāo)要求,市場(chǎng)需求促進(jìn)了國(guó)內(nèi)外對(duì)陀螺系統(tǒng)的研究。電源管理系統(tǒng)作為陀螺系統(tǒng)中的關(guān)鍵模塊也成為一大熱點(diǎn)�，F(xiàn)電源管理系統(tǒng)主要由低壓差線性穩(wěn)壓器(Low-Dropout linear regulator)和開(kāi)關(guān)電源組合而成。本文主要研究了應(yīng)用在數(shù)字陀螺系統(tǒng)中的無(wú)片外電容的低壓差線性穩(wěn)壓器。這將有利于陀螺芯片的集成化,使其更廣泛應(yīng)用在電子產(chǎn)品中,滿足市場(chǎng)需求。在詳細(xì)介紹LDO基本工作原理之后,依次分析了LDO的各個(gè)關(guān)鍵指標(biāo)。隨后根據(jù)LDO系統(tǒng)指標(biāo)的要求,開(kāi)始對(duì)LDO中的帶隙基準(zhǔn)電路,誤差放大器等模塊進(jìn)行設(shè)計(jì)。設(shè)計(jì)時(shí)為了提高系統(tǒng)的溫度系數(shù),對(duì)帶隙基準(zhǔn)源進(jìn)行了高階溫度補(bǔ)償,用不同溫度系數(shù)的電阻來(lái)補(bǔ)償其溫度系數(shù)的高階項(xiàng)。其次考慮到LDO負(fù)載變化快,應(yīng)用了快速瞬態(tài)響應(yīng)補(bǔ)償回路,來(lái)改善系統(tǒng)的瞬態(tài)響應(yīng)。出于對(duì)系統(tǒng)穩(wěn)定性的考慮,在瞬態(tài)補(bǔ)償電路中增加了補(bǔ)償電容,使此補(bǔ)償電路具有類密勒效應(yīng)。然后建立系統(tǒng)的等效小信號(hào)模型,分析系統(tǒng)穩(wěn)定性。因?yàn)樨?fù)載電流大,為了保證LDO能夠輸出足夠大的電流和實(shí)現(xiàn)低壓差,采用了PMOS做功率管。完成各單元電路設(shè)計(jì),對(duì)整體LDO電路仿真驗(yàn)證性能,滿足指標(biāo)要求后繪制電路版圖。本文設(shè)計(jì)的低壓差線性穩(wěn)壓器采用0.35μm CMOS工藝,并在Cadence中完成了具體電路設(shè)計(jì)和版圖設(shè)計(jì)。仿真結(jié)果表明了LDO系統(tǒng)穩(wěn)定輸出0-30mA電流。在室溫條件下測(cè)得LDO的線性調(diào)整率是37.1μ/V,負(fù)載調(diào)整率是1.2μV/mA;-40°C到85°C范圍內(nèi)溫度系數(shù)為4.1ppm/°C,最大過(guò)沖電壓為103mV;系統(tǒng)開(kāi)環(huán)增益134dB,相位裕度大于60?,電源抑制比在低頻時(shí)為82dB。綜上,本論文設(shè)計(jì)的LDO滿足系統(tǒng)應(yīng)用要求。
[Abstract]:With the wide application of gyroscope sensors in recent years, the market has put forward higher requirements for gyroscope system. The market demand has promoted the research of gyroscope system at home and abroad. As the key module of gyroscope system, power management system has become a hot spot. At present, the power management system is mainly composed of Low-Dropout linear regulator and switch electricity. This paper mainly studies the low-voltage differential linear voltage regulator without off-chip capacitance in digital gyroscope system, which will be beneficial to the integration of gyro chip. After introducing the basic working principle of LDO in detail, the key indexes of LDO are analyzed in turn. Then, according to the requirements of LDO system, the bandgap reference circuit in LDO is started. In order to improve the temperature coefficient of the system, the high-order temperature compensation of the band-gap reference source is carried out in order to improve the temperature coefficient of the system. The resistance of different temperature coefficients is used to compensate the higher order term of the temperature coefficient. Secondly, considering the fast change of LDO load, the fast transient response compensation loop is applied to improve the transient response of the system. The compensation capacitor is added to the transient compensation circuit to make the compensation circuit have similar Miller effect. Then the equivalent small signal model of the system is established to analyze the stability of the system. In order to ensure that LDO can output large enough current and realize low voltage difference, PMOS is used as power transistor. The circuit design of each unit is completed, and the performance of the whole LDO circuit is verified by simulation. The low voltage difference linear regulator designed in this paper adopts 0.35 渭 m CMOS process. The simulation results show that the LDO system outputs 0-30mA current stably. At room temperature, the linear adjustment rate of LDO is 37.1 渭 / V, and the load adjustment rate is 1.2 渭 V / mA1-40 擄C to 85 擄C. The maximum overshoot voltage is 103 MV, the open loop gain of the system is 134 dB, the phase margin is greater than 60? The PSRR is 82 dB at low frequency. In summary, the LDO designed in this paper meets the requirements of system application.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM44
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本文編號(hào)：1565875