M
Marcin Szczepaniak
- Jan 1, 1970
- 0
Hi!
I am trying to simulate some kind of regulated power supply using Multisim 8.
Look at the circuit (It amplifies voltage at 200 miliohm serial resistor)
http://szczepan.sieradz.info/tmp/multisim.jpg
It is minimal circuit which shows my problem.
As you can see at picture - LM324 produces negative voltage relating to ground!
But it is impossible - opamp is powered with +12 and 0V voltages.
When i change LM324 with 'virtual opamp' it works as expected - there is no
negative voltage at output.
I know that LM324 is far from ideal but i think it doeesn't have ability to
produce negative voltages, especially when there is no capacitor or inductor in
this circuit.
My question is - what am i doing wrong? What should i set in Multisim to have
correct simulation ?
greetings
Marcin
I am trying to simulate some kind of regulated power supply using Multisim 8.
Look at the circuit (It amplifies voltage at 200 miliohm serial resistor)
http://szczepan.sieradz.info/tmp/multisim.jpg
It is minimal circuit which shows my problem.
As you can see at picture - LM324 produces negative voltage relating to ground!
But it is impossible - opamp is powered with +12 and 0V voltages.
When i change LM324 with 'virtual opamp' it works as expected - there is no
negative voltage at output.
I know that LM324 is far from ideal but i think it doeesn't have ability to
produce negative voltages, especially when there is no capacitor or inductor in
this circuit.
My question is - what am i doing wrong? What should i set in Multisim to have
correct simulation ?
greetings
Marcin