JSSC 2025第12期RF & Wireless0.18-µm BCD工艺

A Shoot-Through-Free 180-MHz Isolated Converter With PG-Downsized PA for Low EMI

一种180MHz低EMI隔离转换器，采用PG缩放的D类功率放大器，有效消除偶极子辐射并防止直通电流。

45.3%峰值效率，1W最大输出功率，符合CISPR-32 Class-B标准

隔离转换器低EMID类功率放大器频率跳跃PCB变压器

▸对称拓扑结构消除偶极子辐射

▸串联电感防止直通电流

▸主动驱动晶体管解决振荡退化问题

Abstract

This article presents a 180-MHz low electromagnetic interference (EMI) isolated dc-dc converter using a PG-downsized Class-D power ampliﬁer (PA). This PA features a symmetrical topology that e ﬀectively cancels dipole emissions, while its series inductors placed between the cross-connected high-side and low- side transistors that inherently block shoot-through currents. To address the resulting degeneration states of oscillation, we introduce small, actively driven transistors, whereas the origi