一种高效低纹波双端输出的电荷泵设计

Design of a high-efficiency and low-ripple chargepump circuit with double output

针对传统电荷泵电压损耗严重和输出纹波较高的缺点,本文提出了一种高效低纹波双端输出电荷泵。该电荷泵基于传统电荷泵做了结构上的改进,利用栅压驱动,减小输出纹波,达到正反相倍压输出,并设计一款稳定高驱动能力的振荡器电路,振荡器电源由电荷泵输出端直接自给,降低了电压损耗,提高了转换效率。电荷泵电路基于0.6μm CMOS工艺进行设计与仿真,仿真结果表明改进型电荷泵启动稳压时间仅为51μs,在常规电源电压2.8~5 V均可达到正反相倍压的目的。典型电源电压3.3 V,负载电流10 mA条件下,输出V+可达6.2 V,V-可达-6 V,纹波仅为15 mV,具有转换效率高,稳压输出的优点,改善了性能指标。

Aiming at the shortcomings of the traditional charge pump with serious voltage loss and high output ripple,a high efficiency low ripple double-ended output charge pump isproposedin this paper.Based on the traditional charge pump,drive with gate voltage,the charge pump has been structurally improved to reduce the output ripple and achieve positive and negative voltage doubled output,and design a stable and high-driving oscillator circuit.The power supply of the oscillator is self-sufficient from the output of the charge pump,reducing Voltage loss improves conversion efficiency.The charge pump circuit is designed and simulated based on the 0.6μm process.The simulation results show that the improved charge pump's start-up voltage regulation time is only 51μs,and it can achieve the purpose of positive and reverse voltage multiplication at a conventional power supply voltage of 2.8~6 V.Typical power supply voltage 3.3 V,load current 11 mA,output V+up to 6.2 V,V-up to-6 V,ripple is only 15 mV,has the advantages of high conversion efficiency and regulated output.The performance index is enhanced.