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(nèi)跨導(dǎo)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(shè)計的低功耗軌對軌輸出運算放大器中,由于信號的動態(tài)范圍比較小,它的輸出驅(qū)動能力不強,這里設(shè)計的是采用電平位移電路同時實現(xiàn)了電路的強驅(qū)動能力與低功耗,它具有在單電源電壓5v的條件下,靜態(tài)工作電流只有幾微安,單位增益帶寬達100k ,開環(huán)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(yōu)點。