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1、null 28 null 62011M 6 0 9 MICROELECTRONICS & COMPUTER Vol.28null No. 6June 2011l : 2010- 09- 13; : 2010- 12- 25B a Buck DC/DC M 吴null 了,郭苗苗( 2 v 9 Y , 2 410082)K null 1 : 电流采样电路作为电流控制的 DC/ DC变换器重要组成部件之一,其精度和响应速度已受到越来越高的重视.提出的电流采样电路没有使用运算放大器,简化了电路结构,降低了功耗.同时,电路中引入的补偿电流进一步提高了采样的精度.基于0.5 nullm CM OS工艺实
2、现该电路, HSPICE模拟仿真结果表明该电路具有较高的采样精度,最高可达99. 9%,且在负载a输入电压a温度变化时,采样精度波动很小.1 o M : DC/DC;电流控制;电流采样;响应速度;高精度;稳定 m s | : TN432null null null null null D S M : A null null null null null c I | : 1000- 7180( 2011)06- 0046- 05IntegratedHighnullaccuracyOnnullchipCurrentSensingCircuitforCurrentnullmodeControlCMO
3、SDCnullDCBuckConverterWU Liao, GUO Miaonullmiao( School of Computer and Communication, Hunan University, Changsha 410082, China)Abstract: Current sensing circuit is one of themost important component parts of currentnullcontrol DC/DC convertor,its accuracy and response speed acquires more and more a
4、ttention. We proposed a novel current sensing circuit inthis paper, which does not use the operational amplifier, simplify the circuit structure, reducing power consumpnulltion, at the same time, the introduction of the compensation current further improves the sensing accuracy. Denullsigned thecirc
5、uit based on 0.5 nullm CMOS process, HSPICE simulation results show that thecircuit has a high sensnulling accuracy up to 99. 9%, and as workload, input voltageand temperaturechanges, thefluctuation of sensing accunullracy of the circuit is very small.Keywords: DC/ DC; currentnullmode; current sensi
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8、 9 m . CCB / 7 ,P MP2 MP3 m 4 L = U , B 9 v 9 m ,7 O V y Y . H ,I n Ipsh Ib K Isen,7 H , Ips d Ib, Isen l , q v , y N V sen B v l MN3aMN2 Ib , H 9 ? L C .m 4null 4 null null e Buck DC/DC M , q 5 H ,7 q 5 H ,m 5 L U q T ,N H MP q 7 1 5 Y , MS2aMS3aMN 5 H ,MP2aMP3aMN3aMN2 P V A V B M , MP1 5 MP 5 P E M ,7 MP1 5 z 1 l MP,V 7V L C .m 5null Y null null s m 5 U / : V A Vsen , : w T (6)aT (7),V 7 1 T (8):48null 6 , :B a Buck DC/ DCM
