关键词: 电荷泵, 电压增益, 转换效率, 电压纹波

Abstract: In order to solve the problem of bulk effect and charge backflow in existing charge pumps, a charge pump circuit with high gain and low ripple is proposed. It adopts two complementary structures to reduce the output voltage ripple. It uses potential selection circuits and two-phase low-level non-overlapping clock to eliminate bulk effect and charge backflow to improve voltage gain and conversion efficiency. Results from Hspice simulation show that, compared to existing charge pumps, the proposed charge pump has higher output voltage and lower voltage ripple under the circumstance of same stage of 5 and current load.

Key words: charge pump, voltage gain, conversion efficiency, voltage ripple