lhlbluesky
Banned
about buffered opamp
i want to design a buffered opamp,the first stage is folded cascoded opamp,and the second stage is class AB push-pull output;for the sake of stability,i added a capacitor
C1 in the output of first stage;
but my problem is,when i increase GBW,the PM decrease;when i increase PM,GBW
decrease;if GBW is fixed, increase PM will decrease the dc gain;
how to increase GBW(from 10M to 100M) with PM 60deg and dc-gain 60dB;
very confused,pls help me.
i want to design a buffered opamp,the first stage is folded cascoded opamp,and the second stage is class AB push-pull output;for the sake of stability,i added a capacitor
C1 in the output of first stage;
but my problem is,when i increase GBW,the PM decrease;when i increase PM,GBW
decrease;if GBW is fixed, increase PM will decrease the dc gain;
how to increase GBW(from 10M to 100M) with PM 60deg and dc-gain 60dB;
very confused,pls help me.