analog_prodigy
Full Member level 2
hi friends,
i got one problem.
i have already one opamp, for which i checked gain, ugb and phase margin. everything is fine because i gave 1V ac signal to one input (DC bias voltage at two inputs) and did ac analysis.
now my opamp is used in a big circuit having different blocks like bias, loads, and extra circuitry.
can i do ac analysis of my opamp at this system level? if so, where should i give my ac 1V input ( because the two input nodes are already connected to somewhere in the big circuit)
Please help me in this regard.
Added after 3 hours 40 minutes:
Hi, i got the solution like this.
i calculated the overall capacitance the output node experienced.
i put the same as load capacitance and test it as individual opamp.
i hope the procedure is correct
i got one problem.
i have already one opamp, for which i checked gain, ugb and phase margin. everything is fine because i gave 1V ac signal to one input (DC bias voltage at two inputs) and did ac analysis.
now my opamp is used in a big circuit having different blocks like bias, loads, and extra circuitry.
can i do ac analysis of my opamp at this system level? if so, where should i give my ac 1V input ( because the two input nodes are already connected to somewhere in the big circuit)
Please help me in this regard.
Added after 3 hours 40 minutes:
Hi, i got the solution like this.
i calculated the overall capacitance the output node experienced.
i put the same as load capacitance and test it as individual opamp.
i hope the procedure is correct