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Op-Amp Gain Simulation Incorrect
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charlbur 6 years ago
Hi All I am reasonably new to spice simulation and seem to be getting incorrect gain simulation for my inverting amplifier circuit. I started out using a TL072 and then tried a completely different and simplified circuit with a TL071 with similar results. I then tried the standard UA741CP from the EELib library with exactly the same results. I am expecting a 30DB gain with a 10K input resistor and a 300K feedback resistor and a dual rail +-15V supply. All the designs and other simulations on other software indicate I should be getting a 30DB gain with +-3V on the output. Below is my sample circuit, if anyone can shed some light on why this isn't working in Easyeda or let me know where I am going wrong it would be great. Thanks https://easyeda.com/editor#id=1bbd828e7e564518951d7ffe8a7432d2
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andyfierman 6 years ago
The problem is that you are using schematic symbols that do not have simulation models associated with them. To get up to speed with simulation in EasyEDA, please see (3) in: https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f Re: uA741; see also; https://easyeda.com/forum/topic/Guitar_pedal_frequency_response-Y8lx7530m
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charlbur 6 years ago
Excellent, thank you so much for the assistance. I found a spice model for exactly the component I was looking for a low noise NE5534 op-amp, the simulation and gain is working perfectly now. The description in the link below pointed me the right direction: https://easyeda.com/forum/topic/Guitar_pedal_frequency_response-Y8lx7530m And choosing the NE5534 spice model from following the below path did the trick. SHIFT+F > System Components > Spice Simulation > Spice Miscellaneous > uA741
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