A fast transient ripple-based adaptive on-time (RBAOT) controlled DC-DC buck converter is presented in this paper. Firstly, for improving the output DC accuracy while keeping the fast transient response, a dual-loop DC offset cancellation technique is proposed. The fast loop ensures fast transient response, and the slow loop to compensate for the output DC offset introduced by ripple injection. Secondly, considering the parasitic resistances of the devices, the proposed switching frequency compensation technique reduces the frequency variation in steady state regardless of the input output voltage and load current condition. The proposed buck converter has been fabricated using 0.18-μm CMOS process. Measurement results show that the proposed converter has an outstanding output DC accuracy, the output offset is less than 2 mV. Moreover, the switching frequency is centered at 2 MHz with less than 1.5% variation for an output of 1.8 V and inputs ranging from 2.1 to 3.6 V. The maximum conversion efficiency is up to 94.6%, and the transient response times are 2 and 3 μs at rising and falling edges, respectively.

本文介绍了一种基于快速瞬态纹波的自适应导通时间 (RBAOT) 控制的 DC-DC 降压转换器。首先，为了在保持快速瞬态响应的同时提高输出直流精度，提出了一种双环直流偏移消除技术。快速环路可确保快速瞬态响应，而慢速环路可补偿纹波注入引入的输出 DC 偏移。其次，考虑到器件的寄生电阻，无论输入输出电压和负载电流条件如何，所提出的开关频率补偿技术都减少了稳态下的频率变化。所提出的降压转换器已使用 0.18-μm CMOS 工艺制造。测量结果表明，所提出的转换器具有出色的输出直流精度，输出偏移小于2 mV。而且，