jutek said:hello
could you tell me how to do AC open loop LDO simulation properly?
how the inputs should be polarized when i open the loop to pass device give me the current i want to
when i do transient and op analyses, everything is ok. vref is connected to - and output voltage through feedback divider to +.
i want the AC simulation to be adequate TRANSIENT simulation, to be sure how gain, UGF and pole/zero position influence transient response
thanks in advance
regards
jutek said:hello
yes, i have this book, and i exactly break the loop in this place. but what should be connected to - after breaking? if i use only AC=0.1 and no DC value the result is not good cause opamp is not polarized well
alenhan said:another way is add a large inductor on you feedback path, and a capacitor connect to ground from opamp side. this may help you to do AC simulation.
myblues said:alenhan said:another way is add a large inductor on you feedback path, and a capacitor connect to ground from opamp side. this may help you to do AC simulation.
this maybe a good idea!
but it could make some other problem. when I connect a capacitor (c=10p) parallelled with resistor R3, it should bring a pole and a zero. But because the large capacitor(c=1KF) connected in the input so by hspice simulation the capacitor parallelled with the resistor R3 will not take some effect!
gavinchiu said:Can I use the resistor instead of the inductor for AC simulation.
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