Need an inverting amp

Thread Starter

Danm1

Joined Jul 19, 2010
69
I have pulled a simple inverting amp design off the internet and do not understand why it works on periodic signals but on arbitrary signals it seems to fail.

See the LTSpice screenshot... (the blue is the input signal)

Any comments would be appreciated!
 

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sghioto

Joined Dec 31, 2017
2,272
The amplifier is doing it's job. The gain is set at 5 so any signal 1.8 volts and above will max out at -9 volts on the simulator.
 

Thread Starter

Danm1

Joined Jul 19, 2010
69
I have played with the resister values to get the best results, this has 50k resisters and looks better than some of the other runs,
but the resulting wave form is not perfect, there is some rounding of the corners, any comments on how to improve that would be appreciated!!
 

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Thread Starter

Danm1

Joined Jul 19, 2010
69
Ok so it's the slew rate, I can search for a better op amp in this regard.
But in the mean time I think I can build the circuit with this for the time being(since I have a bunch of LM358 parts), by the time I build the second version I can order another part.

Thank You!!
 
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