▸创新点1：自学习序列匹配滤波器与电感响应（方法创新） - 通过引入自学习序列在启动和上电复位时动态匹配内部滤波器的增益和带宽与功率电感及其等效串联电阻(ESR)，解决了传统无损耗电流检测方案因滤波器和电感不匹配导致的精度问题，将DC和AC电流增益误差分别降低至8%和9%。
▸创新点2：全集成CMOS实现（电路创新） - 采用0.5μm CMOS工艺实现了完全集成的电流检测方案，避免了分立元件的使用，提升了系统的可靠性和一致性，同时减少了外部元件的依赖。
▸创新点3：提升电流检测精度（性能创新） - 相比现有无损耗方案20%-40%的误差，该方案在宽范围电感(3.5μH–14μH)和ESR(48mΩ–384mΩ)条件下显著提高了精度，且无需预先知道功率MOSFET或电感的标称参数。
▸创新点4：能效优化（系统创新） - 由于自学习序列仅在启动时运行一次，方案的整体功耗极低，与传统串联检测电阻技术相比实现了2.6%的能效提升，适用于对功耗敏感的应用场景。
Abstract
Sensing current is a fundamental function in power supply circuits, especially as it generally applies to protection and feedback control. Emerging state-of-the-art switching supplies, in fact, are now exploring ways to use this sensed-current information to improve transient response, power efficiency, and compensation performance by appropriately self-adjusting, on the fly, frequency, inductor ripple current, switching configuration (e.g., synchronous to/from asynchronous), and other operating parameters. The dis- continuous, non-integrated, and inaccurate nature of existing lossless current-sensing schemes, however, impedes their wide- spread adoption, and lossy solutions are not acceptable. Lossless, filter-based techniques are continuous, but inaccurate when inte- grated on-chip because of the inherent mismatches between the filter and the power inductor. The proposed G /77-C filter-based, fully integrated current-sensing CMOS scheme circumvents this accuracy limitation by introducing a self-learning sequence to start-up and power-on-reset. During these seldom-occurring events, the gain and bandwidth of the internal filter are matched to the response of the power inductor and its equivalent series resistance (ESR), effectively measuring their values. A 0.5 m CMOS realization of the proposed scheme was fabricated and ap- plied to a current-mode buck switching supply, achieving overall DC and AC current-gain errors of 8% and 9%, respectively, at 0.8 A DC load and 0.2 A ripple cur