Considering the propagation delay, dVSW/dt immunity, and power dissipation issues in bootstrapped high-side gate driver design, a monolithic high-voltage DC-DC buck converter with high-speed dynamic level shifter and improved gate drive buffer is presented in this paper. With the introduction of an instantaneous dynamic current, the propagation delay of the level shifter is reduced to 1.13 ns for the high-side switch. The dVSW/dt immunity is enhanced by a dynamic current compensation during positive slewing and a diode voltage clamp during negative slewing. The average current consumption of the level shifter is only 8.45 μA at a switching frequency of 1 MHz. The proposed gate drive buffer eliminates the shoot-through current with the use of dead time control. The compact level shifter and buffer are also used to drive an integrated p-MOS transistor serving as a bootstrap diode emulator. Experimental results show that the fabricated converter with the proposed scheme regulates well with an 18 V input, 1.05 V output and 2 A load current. Also, high efficiency of up to 93 % is achieved.

Location-based services are now playing an integral role in the development of emerging industries, such as the Internet of Things, artificial intelligence and smart cities. Although GPS, Beidou and other satellite positioning technologies are becoming more and more mature, they still have certain limitations. In order to meet the needs of high-precision positioning, wireless positioning is proposed as a supplementary technology to satellite positioning, in which the Received Signal Strength Indication (RSSI) is one of the most popular positioning methods. In this paper, the application scenarios, evaluation methods and related localization methods of wireless positioning based on RSSI are studied. Secondly, the relevant optimization methods are analyzed and compared from different angles, and the methods of RSSI data acquisition are described. Finally, the existing problems and future development trends in RSSI positioning methods are expounded, which has certain reference significance for further research on RSSI localization.