Analog IC Design by Dr. Nagendra Krishnapura, Department of Electronics & Communication Engineering, IIT Madras. For more details on NPTEL visit nptel.iitm.ac.in
then we essentially have the same issue with the one stage opamp. I.e, for Ve=0, output of the added circuit will still be zero and not contribute anything. By adding the second stage, the capacitor holds the voltage even at zero input (similar to an integrator stabilizing at 0 input) and this voltage on the capacitor is converted to a current by the transconductance amplifier, thereby giving a current to the output G_(OL) which further increases output to saturate close to desired k*V_i
Title of the video is fees forward compensation Opamp
Why can't we only use one VCCS (instead of two) to feed the "added" current to the OpAmp?
To obtain more gain
then we essentially have the same issue with the one stage opamp. I.e, for Ve=0, output of the added circuit will still be zero and not contribute anything. By adding the second stage, the capacitor holds the voltage even at zero input (similar to an integrator stabilizing at 0 input) and this voltage on the capacitor is converted to a current by the transconductance amplifier, thereby giving a current to the output G_(OL) which further increases output to saturate close to desired k*V_i