Chinmaye
Full Member level 3
I have designed a 2 stage op-amp to be used in a switched capacitor circuit. The first stage of the op-amp is diff input and diff output op-amp with NMOS input pair. The NMOS current source carries a current of 640uA. I am mirroring it from 10uA current source. So, the ratio of (W/l) = 1:64. With this arrangement the gain and PM of the op-amp are satisfactory. But, when I use this in an SC circuit I get a distorted output.
I tried to use 2 mirrors with ratios 1:32 and 1:2. This arrangement works fine in the SC circuit. I don't understand the reason. Any leads?
I tried to use 2 mirrors with ratios 1:32 and 1:2. This arrangement works fine in the SC circuit. I don't understand the reason. Any leads?