pm1~pm3 ~ m1~m4 m8 m6 => symmetric ota
pm4 power mos driver ,
r1,r2 feedback res .
cc compensation Cap
不过compensation cap 选 m8 m6中间原因为何?
找到类似 compensation 但是 还是 不同
Figure 24.37 A cascode OTA circuit with common-source output buffer (an op-amp).
Note the inverting and noninverting terminals are swapped from Fig. 24.35.