3 . a good result is gotten under the star - hspice simulation . the dc gain is 90 db , the offset voltage is 40 u v while driving 10k , the unity - gain frequency is 10mhz with phase margin 67 , the slew rate is 10w us while driving 10pf 用star - hspice仿真軟件對電路仿真,在1 . 5v電源電壓、直流10k負載、交流10pf負載的情況下,整個共模電壓范圍內跨導基本保持恒定,只有18的變化,直流增益90db ,單位增益帶寬10mhz ,相位裕度80度,壓擺率10v s 。
Usually the low power operational amplifier is designed with rail to rail output stage , whose signal dynamirange is small , its output driving force is not strong , here it is designed with voltage displacement stage , and the strong driving force and the low power consumption in this circuit are achieved . with 5v single power , this amplifier consumes only several a , 100khz unity - gain frequency , achieves 80db dc open gain and 55 phase margin for a 100pf load capacitance and a 1m load resistance and other advantages 通常設計的低功耗軌對軌輸出運算放大器中,由于信號的動態范圍比較小,它的輸出驅動能力不強,這里設計的是采用電平位移電路同時實現了電路的強驅動能力與低功耗,它具有在單電源電壓5v的條件下,靜態工作電流只有幾微安,單位增益帶寬達100k ,開環增益能達80db以上,相位裕度也能達55度,輸出源沉電流達500微安以上等優點。