Power Management Technique Smoothing Regulated Digital Supply Between Modes Switching for Low Power Wireless Sensing Application This paper presents the power management technique which smooths the regulated supply when it is switched between full power mode and sleep mode for low power sensing application. To reduce the average power consumption, the full function of sensor chip is only activated during a tiny piece of lifecycle, which means linear regulator should be switched between different operation modes periodically. The proposed technique enables to remove the overshoot and undershoot at the same time by reasonable switching sequence and smoothly enable gate driver (SEGD) of power switch. The error amplifier, comparator, feedback loop and output PMOS transistors in both high performance and low performance regulators are switched onoff separately. A generalized accuracy analysis of gate driver is given to prove the reliability. The digital supply system is designed in XFAB 180 nm mixed signal CMOS technology, where regulator is designed with thick oxide device and 3.3 V supply and low voltage components are utilized in SEGD with 1.8 V supply. Overshoot and undershoot as high as to 1.4 V in the worst corner can be removed by the proposed solution.

Digital Low Power Mode Control Technique for HighFrequency Synchronous DCDC Buck Converters This paper presents a low power mode control technique for digitally controlled synchronous buck converters optimized for the heavy load regulation. The proposed control mode achieves compact area and low complexity thanks to an efficient logic partitioning and reuse of the digital controller. The inductor peak current is controlled with a predictive algorithm that does not require current sensing. A prototype of a digitally controlled synchronous 5xe2x80x940.9 V, 1.5 A buck DCDC converter that embeds the low power control technique is implemented. A custom IC in a 28nm CMOS process has been designed for the digital controller and the gate drivers. Experimental results indicate that the high efficiency range is extended, obtaining an efficiency improvement up to 43% at light load.