P026MX
為了提高增益，在共源共柵結(jié)構(gòu)上附加輔助運(yùn)算放大器，如圖3所示，可以增強(qiáng)共源共柵效應(yīng)。輔助運(yùn)放的放大倍數(shù)為Aadd，通過(guò)減小由輸出到輸入管漏極的反饋，輸出可增大Aadd倍，也即等效于：Rout≈(gm2rds2(Aadd+1)+1)rds1+rds2。其中，gm2是M2管跨導(dǎo)，rds1與rds2分別為M1與M2的輸出阻抗。因此電路的直流增益也會(huì)增大同樣的倍數(shù)，Av=gm1Rout≈-gm1rds1(gm2rds2(Aadd+1)+1)。
同理，給圖2中的套筒式主運(yùn)放加上輔助運(yùn)放后，其直流增益可提高為Av=-gm1[(gm5rds5rds7Aadd_p)//(gm3rds3(rds9//rds1)Aadd_n)],式中Aadd_n和Aadd_p分別是輔助運(yùn)放A_n和A_p的放大倍數(shù)。圖4中示出了n型輔助運(yùn)放A_p的結(jié)構(gòu)。
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