← 返回 JSSC 论文列表JSSC 2014第12期Analog Circuits65nm
Switched-Mode Operational Ampli fiers and Their Application to Continuous-Time Filters in Nanoscale CMOS
提出新型开关模式运算放大器(SMOA)，在65nm CMOS中实现高效低电压连续时间滤波器
65nm CMOS, 0.6V供电, 70MHz带宽, 25.4mW功耗, 55.8dB SNDR
开关模式运算放大器连续时间滤波器低电压设计时间域编码轨到轨输出
▸创新点1：利用时间域编码突破电压摆幅限制（方法创新）：通过将模拟信号信息编码到时间域，克服了传统反馈放大器在缩放CMOS技术中的电压摆幅限制，实现了更高的信号处理能力。
▸创新点2：实现近轨到轨输出摆幅（电路创新）：SMOAs设计使得输出信号摆幅接近电源电压，显著提高了信号动态范围，适用于低电压应用场景。
▸创新点3：提高输出级效率和线性度（电路创新）：通过优化输出级设计，SMOAs在保持高线性度的同时，显著提高了输出级的效率，减少了功耗。
▸创新点4：应用于连续时间滤波器（系统创新）：将SMOAs应用于4阶70 MHz连续时间Butterworth滤波器，展示了其在低电压、高带宽应用中的优势，实现了55.8 dB的峰值SNDR和25.4 mW的低功耗。
Abstract
We introduce a new class of feedback ampli fiers, called switched-mode operational ampli fiers (SMOAs) that ad- dress voltage-swing limitations of classical feedback ampli fiers in scaled CMOS technologies. By explo iting the increased timing res- olution available in scaled CMOS, SMOAs encode analog signal information in the time domain and provide near-rail-to-rail output-signal swing, high output-stage ef ficiency and better linearity. A 4th-order, 70 MHz continuous-time active-RC But- terworth filter is presented in 65 nm CMOS to demonstrate the advantages of SMOAs. The filter consumes 25.4 mW from a 0.6 V supply and achieves 55.8 d B peak SNDR while operating at a full-scale of 873 mV . Thanks to SMOAs, the full-scale (73% of the 0.6 V supply voltage ) and the bandwidth are respec- tively, a 2.5 and 6.2 improvement over other state-of-the-art low-voltage filters.