LTSpice - Op Amp Circuit

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Комментарии
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I am here because my university lecturer gave me this link

adrianwong
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Thank you for sharing. Very informative.

mortenlund
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Jesus square resolution in 2018, but really thanks!

dashrek
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I'm questioning the polarity of the V3 voltage source. It appears to be reversed to the OP AMP. Is it possible that you were measuring the differential rail voltage at the output?

bernardscarlatelli
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Thanks for this video. Maybe you can help me out with one question: I want to convert a high-frequency pulsed 3.3V input signal to 12V pulsed output (non-inverted).
I have +12V connected to supply voltage PLUS.
I have GND connected to supply voltage MINUS.
The 3.3V pulsed signal (i.e. alternating between +3.3V and 0V) is connected to the PLUS input.
GND is connected to the MINUS input.
Now here's the problem: the low-voltage pulsed input works fine, but at the op-amp output I get a constant line of the full 12V, no pulse whatsoever (even though I can confirm that the pulsed input goes all the way down to zero/GND between pulses).
Note: I used the AD712 in the simulation (one of the original components that come with LTSpice); I could of course not use op-amps at all and instead switch the 12V voltage via a MOSFET that is triggered by the 3.3V signal, but I wouldn't like this alternative, because 3.3V isn't enough to fully open the gate.
Any ideas?

EDIT:
Ah... okay, I got it now: I neglected the amplification ratio. I thought I could let it simply ramp up to the max (=supply voltage) each time there is a potential difference between input + and -. Now that I inserted resistors (1) between input - and op-amp out and (2) between input - and GND, it works just fine. I won't erase this comment even though the problem is solved, because maybe it will help others in the future.

___Chris___
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another wonderful ltspice op amp video.... EE do you have one on the Vishay-IL300 linear opto-isolator? i am setting one up in LTspice and may need suggestions? thanks...:)

qzorn
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i got 0V and -1V on the last simulation

Daniel-djfh