JanniS
Newbie level 6
I have a problem with an open loop simulation.
I have a resistive load of 10 Kohm and a capacitive of 1pF. Usually I just insert a DC offset voltage source at one of the input terminals, run a DC sweep and chose the offset value to be where the output voltage is in the middle.
This time I can not find this point. i think it is because of the resistive load, because I usually only have capacitive load. It seems like the simulator can not find a point in the middle even with 10 significant digits of the offset source.
Another method I tried is to simulate with a feedback network consisting of a 100 Gohm resistor and a 10F capacitor to create an output voltage in the middle, but when I do that the phase response starts at -180 degrees.
So... how do you usually simulate open loop? My gain is around 80-90 dB..
Thank you!
I have a resistive load of 10 Kohm and a capacitive of 1pF. Usually I just insert a DC offset voltage source at one of the input terminals, run a DC sweep and chose the offset value to be where the output voltage is in the middle.
This time I can not find this point. i think it is because of the resistive load, because I usually only have capacitive load. It seems like the simulator can not find a point in the middle even with 10 significant digits of the offset source.
Another method I tried is to simulate with a feedback network consisting of a 100 Gohm resistor and a 10F capacitor to create an output voltage in the middle, but when I do that the phase response starts at -180 degrees.
So... how do you usually simulate open loop? My gain is around 80-90 dB..
Thank you!