带电压前馈的固定充放电时间锯齿波振荡器
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摘要
设计了一种用于降压型DC-DC开关电源转换器的锯齿波振荡器。利用电压前馈方法和固定充放电时间方法,实现了锯齿波幅度随电源电压线性变化且频率固定的锯齿波振荡器,抑制了电源电压突变时的输出电压过冲。基于0.18μm BCD工艺进行设计和仿真。仿真结果表明,该锯齿波振荡器产生的锯齿波频率为2.73MHz。在2.7～5.5V电源电压、-55℃～125℃温度范围内,频率偏移在±6%以内。振荡幅度在0.576～1.470V范围内随电源电压线性变化。
A saw-tooth wave oscillator was designed for buck DC-DC converters.Voltage feed-forward and fixed charge and discharge time techniques were used to keep the amplitude of saw-tooth wave changing linearly and the frequency of saw-tooth wave constant while the supply voltage was changed.Therefore,the overshoot voltage was suppressed when the supply voltage was changed suddenly.Based on a 0.18μm BCD process,the saw-tooth wave oscillator was designed and simulated.Simulation results showed that the frequency of the designed saw-tooth wave oscillator was 2.73 MHz.In the range of supply voltage from 2.7 Vto 5.5 Vand temperature from-55℃to 125℃,the variation of frequency was within ±6%.The oscillating amplitude was changed linearly from 0.576 Vto1.470 Vfollowing the supply voltage.
A saw-tooth wave oscillator was designed for buck DC-DC converters.Voltage feed-forward and fixed charge and discharge time techniques were used to keep the amplitude of saw-tooth wave changing linearly and the frequency of saw-tooth wave constant while the supply voltage was changed.Therefore,the overshoot voltage was suppressed when the supply voltage was changed suddenly.Based on a 0.18μm BCD process,the saw-tooth wave oscillator was designed and simulated.Simulation results showed that the frequency of the designed saw-tooth wave oscillator was 2.73 MHz.In the range of supply voltage from 2.7 Vto 5.5 Vand temperature from-55℃to 125℃,the variation of frequency was within ±6%.The oscillating amplitude was changed linearly from 0.576 Vto1.470 Vfollowing the supply voltage.
引文
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[8]贾孜涵,冯全源,庄圣贤.适用于DC-DC开关电源的振荡器设计[J].电子元件与材料,2015,34(3):29-32.
[2]夏海生,黄世震,林伟.一种适用于DC/DC开关电源芯片的锯齿波振荡器设计[J].电子器件,2009,32(6):1052-1054.
[3]GIERKINK S L,TUIJ E V.A coupled sawtooth oscillator combining low jitter with high control linearity[J].IEEE J Sol Sta Circ,2002,37(6):702-710.
[4] LIN C,LIU Y,KI W H.A 10/30 MHz fast reference-tracking buck converter with DDA-based type-III compensator[J].IEEE J Sol Sta Circ,2014,49(12):2788-2799.
[5]王敬,范哲,冉建桥,等.降压型DC/DC开关电源中的电压前馈技术[J].微电子学,2010,40(2):274-277.
[6] RAZAVI B.模拟CMOS集成电路设计[M].陈贵灿,程军,张瑞智,等译.西安:西安交通大学出版社,2003:233-234.
[7]周前能,王黎,李红娟,等.适用于DC-DC开关电源的锯齿波振荡器设计[J].重庆邮电大学学报(自然科学版),2013,25(4):432-435.
[8]贾孜涵,冯全源,庄圣贤.适用于DC-DC开关电源的振荡器设计[J].电子元件与材料,2015,34(3):29-32.