使用VCCS和UGCC两种频率补偿方案的LDO的设计

发布时间：2018-05-04 10:56

本文选题：LDO + 频率补偿　；参考：《复旦大学》2014年硕士论文

【摘要】：随着智能手机、平板电脑、笔记本、数码相机等电子产品的普及,人们对电子产品的便携性、续航能力的要求也越来越高。便携性电子产品的体积比较小,·因而它们所配备的电池容量也比较小。为了提高电池电量的利用效率,提高电池续航能力,需要用到电源管理技术。LDO(低压差线性稳压器)作为一种电源管理产品,其市场份额高达26%,具有非常高的应用价值。相对于其它线性稳压器,LDO能够提高电源转换效率,但是由于它的输出阻抗会随着负载发生改变,因而它存在着稳定性的问题。为了实现LDO的稳定性,LDO的频率补偿方案成为研究热点。本文研究了LDO的基本结构和工作原理,并将LDO几种不同的频率补偿方案进行了分析和对比,从而选择使用两种频率补偿方案来实现LDO的设计：即压控电流源(VCCS, Voltage Control Current Source)补偿和单位增益补偿单元(UGCC, United Gain Compensation Cell)补偿。VCCS补偿的LDO仅使用1pF的片上电容实现了频率补偿,UGCC补偿的LDO可以应用在低电源电压的应用中。本文共完成了7个LDO的设计,每个LDO均有4种不同的输出。本文使用GF2P4M 0.35μm CMOS工艺进行设计与流片验证,并采用4.7μF的陶瓷片外输出电容。测试结果显示,使用两种补偿方案的LDO在负载全幅值跳变(最大负载电流300mA)和输入电压发生跳变时均能保持稳定。VCCS补偿的LDO在输出电压为1.2V的情况下,其负载电流在100ns内在1mA～300mA间跳变时其输出电压变化小于30mV。UGCC补偿的LDO在输出电压为2.7V的情况下,其负载电流在100ns内在1mA～300mA间跳变时其输出电压变化60mV、LDO环路带宽在最大负载电流处最大,可以达到2MHz,跳变稳定时间小于5μs。LDO的压降电压可以达到150mV,其电源抑制比在0.001～40 KHz内均大于45dB。
[Abstract]:With the popularity of smart phones, tablets, notebooks, digital cameras and other electronic products, people are demanding more and more portable and sustainable electronic products. Portable electronics are smaller in size and therefore have smaller battery capacity. In order to improve the utilization efficiency of battery energy and the battery life ability, the power management technology. LDO (low voltage difference linear regulator) is used as a power management product. Its market share is as high as 26, which has a high application value. Compared with other linear regulators LDO can improve the efficiency of power conversion but its output impedance will change with the load so it has the problem of stability. In order to realize the stability of LDO, the frequency compensation scheme of LDO has become a hot research topic. In this paper, the basic structure and working principle of LDO are studied, and several different frequency compensation schemes of LDO are analyzed and compared. Therefore, two kinds of frequency compensation schemes are selected to realize the design of LDO: VCCS, Voltage Control Current Source) compensation and unit gain compensation unit. The LDO compensated by United Gain Compensation Cell) compensation .VCCS only uses the on-chip capacitor of 1pF to realize the frequency. The LDO compensated by UGCC can be used in the application of low power supply voltage. In this paper, seven LDO designs are completed, and each LDO has four different outputs. In this paper, GF2P4M 0.35 渭 m CMOS process is used to design and verify the flow sheet, and the output capacitance of 4.7 渭 F ceramic chip is used. The test results show that the LDO with two compensation schemes can maintain the stability of the LDO with the output voltage of 1.2 V when the maximum load current is 300 Ma and the input voltage jumps. The output voltage variation of 100ns is smaller than that of LDO compensated by 30mV.UGCC when the load current changes between 1mA~300mA and 30mV.UGCC. When the output voltage is 2.7 V, the output voltage changes 60mV / LDO loop bandwidth is maximum at the maximum load current when the 100ns internal 1mA~300mA jumps. The voltage drop voltage of less than 5 渭 s.LDO can reach 150mV, and the power rejection ratio is more than 45 dB in 0.001 ~ 40 KHz.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM44

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