【作者】 江力；

【导师】 吴晓波；

【作者基本信息】 浙江大学 ， 电路与系统， 2007， 硕士

【摘要】 虽经多年发展，在现代集成电路与系统芯片(System on a Chip，SoC)中，集成电路运算放大器的应用依然广泛，并往往由应用需要对其性能提出苛刻的要求。因此，围绕高性能集成电路运算放大器设计技术的研究经久不衰。本文在集成运放发展现状和趋势研究基础上，结合实际项目需要，以系统级设计、输入级、中间放大级、输出级、版图设计和流片测试为线索，结合两个实例讨论了高性能集成运放的设计方法。论文首先讨论的是运放的中间放大级、输出级设计。文章以一个高精度差分放大器为例，根据系统要求，以实现高精度、低电压、高增益、低失真、宽输出共模范围为目标，采用多级放大结构设计了带共模反馈结构的运放全差分中间放大级；采用静态电流控制结构设计了轨到轨的运放输出级，并以嵌套式米勒补偿结构设计了整个运放的补偿。设计的运放在2.7V的供电电压下达到了130dB的增益和仅-95dB的总谐波失真。对提出的设计进行仿真验证的结果表明其主要性能已达到预期要求。论文又进一步讨论了运放的系统设计和输入级设计。以一个高端电流检测放大器为例，以满足其对宽共模输入范围的特殊要求为目标，讨论了放大器的系统设计方法。在研究高共模输入电压输入级设计时，本文在分析以往此类结构基础上，结合两种方法，提出了一种新颖的输入级结构，使放大器的共模输入范围可以达到0～28V，且与供电电压无关。系统的电路级仿真结果证明了本文提出的系统和输入级的有效性。最后，以所提出的电流检测放大器为例，利用1.5μmBCD工艺完成了放大器的布局布线和版图设计，并进行了实际流片与测试。测试结果说明，论文提出的放大器已较好地实现了预定设计目标。这一结果亦验证了本文所述设计方法的有效性。更多还原

【Abstract】 Despite of many years’ development, integrated operational amplifiers are still widely used in modern integrated circuit and system-on-chip (SOC) and are raised rigorous requests of performance to meet the need of application. So the research of high performance operational amplifier design technology is still a hot spot.This thesis analyzed the development of the integrated operational amplifiers and its trend. Combined with the actual needs, this thesis using "system design, input stage, mid stage, output stage" as the thread, combining with two actual design examples, this thesis discussed the high performance operational amplifier design technology.This thesis first discussed the mid stage and output stage. Taking a high-precision differential amplifier for example, in terms of the system, and at the aim of low voltage, high gain low distortion and wide common-mode output range, we designed a multi-stage gain stage, a rail-to-rail output stage with quiescent current control and a nested-miller compensation structure. With these structures, it can archive 130dB gain and only -95dB THD under 2.7V supply voltage. The simulation results showed that the designing lived up to the expectation.We further focused on the system design and input stage design to satisfy the special needs of some amplifiers. Using the High-side current-sense amplifier as an example, aiming at the need of wide input common-mode range of high-side current sense, we discussed the system design methodology. Based on the analysis of previous wide common-mode range input stage solutions; we proposed a novel input stage which combined two ways. It can get a 0-28V input common-mode range which is independent of supply voltage.the circuit level system simulation results proved the proposed design methodology could fulfill the demands.This thesis used the current sense amplifier as the example and finished the floorplan and layout of the amplifier under 1.5μmBCD process. The chip was fabricated and tested. The testing results showed the proposed amplifier met the requirements well and the proposed design methodology is effective.更多还原