Abstract: Based on standard CMOS technology, the working principle and integration method of a basic series-parallel capacitor combined switched-capacitor DC-DC buck converter are analyzed. Two single-ended switched-capacitor converters are connected in anti-phase parallel to reduce output voltage ripple. The MOS switches are driven by the internal node voltage, avoiding the need for individual driving of each switch. Transient analysis of the circuit is performed using SPICE software, and the results are presented. Keywords: DC-DC converter, CMOS switched-capacitor network, opposite-phase parallel configuration. Abstract: The working principle and integrating method of switched-capacitor DC-DC buck converters constructed by basic series-parallel capacitors were analyzed based on standard CMOS technology. The output voltage ripple was reduced by connecting two identical but opposite-phase SC converters in parallel. MOS transistors were driven by internal node voltages to avoid the need for separate gate drivers. The circuit was analyzed transiently by SPICE, and the results were given. Keywords: DC-DC converters, CMOS switched-capacitor network, opposite-phase parallel configuration. 1. Introduction Switched-capacitor converters are a type of switching network that utilizes the principle of charge transfer through the charging and discharging of capacitors; they are also called charge pump converters. These converters consist only of power switches and capacitors, without magnetic components (such as inductors), thus possessing advantages such as simple topology, small size, low electromagnetic interference (EMI), and high conversion efficiency, making them very suitable for power supply design in portable electronic products. Because switched-capacitor converters are discrete-time systems, they require high input impedance to reliably store the stored charge. Therefore, in hybrid integration, CMOS technology is easier to implement compared to other processes. CMOS-based switched-capacitor converters offer advantages such as low power consumption, high integration density, and strong noise immunity. This paper introduces CMOS technology into switched-capacitor networks, analyzes the basic working principle of a buck DC-DC converter composed of second-order series-parallel capacitor combinations, and designs a suitable on-chip switched-capacitor buck converter composed of MOS switches and MOS capacitors. The converter has a parallel symmetrical structure, and computer simulation results show that its performance is superior to that of ordinary switched-capacitor converters. For details, please click: CMOS-based Switched-Capacitor DC-DC Buck Converter