Problem of saturation with 741 models

Whenever I saturate a 741 op-amp by exceeding the limit of his positive supply voltage, the output saturates at the negative supply voltage.

For example, if I build a voltage follower with +/-15 V supplies and an entry of + 20 V, the output is (approximately) - 15 V, not + 15 V.

This product with a variety of 741 op-amp models, such as LM741 *, UA741 *, 741 and Op-Amp_741.

I've seen similar problems with some other families of op-amp I've tried.

Is this a limit known of these models in Multisim, or I do something wrong?

For an example, see the attachment.

Thank you

Bob

yyao wrote:

Hello

This problem may be due to the inversion of JFET. Some operational amplifiers, especially JFET operational amplifiers, exhibit this behavior. When production is expected to exceed some threshold of positivity, the exit opposite to the negative rail. If you plugged a JFET op in a real circuit amp, you will see this behavior. So, this may have to do with the op amp model you use. If this is not the behavior you expect (i.e. not what you observe in a benchtop configuration), my best advice is to substitute your op amp of simulation for a similar performance, but do not present the same reversal of output.

Take a look at this page by Analog Devices. This phenomenon is described in the section titled "what other op amps features users need to know about?

Hope that helps.

I don't think that it is the problem of "phase inversion" described in paragraph 1 of the above-mentioned article.  I don't think that the 741 is a JFET or common mode entry is too negative.

However, there don't seem to be compatible with the "more serious form of short" described in paragraph 2.  This problem occurs when the input exceeds the rail by ~0.6 V voltage, which could backfire on some internal diodes.  The page suggests that it would destroy a real op-amp.  In the simulation, operational amplifier would not be destroyed, but it could show behave erratically when wine > Vrail.

Does make sense for someone else?  I'll try to remember to test this with a real operational amplifier next week.

Tags: NI Software

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