liqiyue
Newbie level 6
I made a fully differential opamp. In open loop ac analysis, the DC gain is 100db, and the GBW is 2G, but the phase margin is only 30 degrees. But when I put the opamp into a closed loop with gain 8, the 3db bandwidth is only 1.4M. So, what's the problem?
And there's another question. In the real application, if only 8 times amplification is needed, and the input signal is only 100MHz, so there's no problem of the poor phase margin?
Thanks!
And there's another question. In the real application, if only 8 times amplification is needed, and the input signal is only 100MHz, so there's no problem of the poor phase margin?
Thanks!