A multi-loop control adaptive clocking digital low dropout regulator with median activation parallel successive-approximation register and compensation detect mechanism

The sensors used in medical devices, such as temperature sensors, humidity sensors, fingerprint sensors, and others, are striving for low power consumption and high performance, driven by the rise of green energy technology. Therefore, in recent years, many system circuits designed for low operating voltage have been proposed, including transceivers, phase-locked loops, oscillators, analog-to-digital converters, and more. To address the aforementioned power requirements, this paper introduces a power management system titled "A Multi-Loop Control Adaptive Clocking Digital Low Dropout Regulator with Median Activation Parallel Successive-Approximation Register and Compensation Detect Mechanism." This system aims to deliver a stable 0.5V voltage output without the need for additional capacitors. Specifically, our contributions include the development of search logic for the entire register control system and the utilization of an adaptive clocking system to generate a 40MHz clock for chasing-state, achieving a settling time of 0.133μs. Furthermore, we reduce the steady-state operating frequency to 1MHz to attain a quiescent current of 12.57μA. Additionally, the compensation loop detection circuit achieves rapid transient response, ensuring that the variation in output voltage remains about 15%. The proposed Low Dropout Regulator is simulated and implemented using the standard 90nm CMOS simulation process.