| 摘要 |
<p>A power CMOS operational amplifier with a differential output (Vout-,Vout+), having an intrinsically stable current absorption under rest conditions, comprises two symmetric branches, each comprising a first folded cascode input inverting stage (M1-M10), a level shifting circuit (M11,M12), a second current mirror type noninverting amplifying stage (M13-M18) and a third output inverting stage (M19,M20), constituted by a complementary pair of transistors, connected in a common source configuration between the supply rails and driven by the output (A",B") of the second noninverting stage and by the output (A',B') of the level shifting circuit. Frequency compensation is accomplished by means of two capacitors (Cc1,Cc2) connected between each of the two output terminals (Vout-,Vout+) of the amplifier and the output (A,B) of the first inverting stage (M1-M10) and a node of the output branch of the noninverting current mirror stage (M13-M18). A single common mode feedback network (McM1-McM3) stabilizes both symmetric branches of the amplifier. <IMAGE></p> |
