Hi,i was creating the butterworth low-pass filter and i have the A/C input values in text form and i want to import these text values to the system ,while using the simulation setting as AC sweep/noise as a result i get result thats say No AC sources-AC sweep ignored message what should i do to import my results from text file?
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An AC Sweep / Noise simulation only uses AC sources, VAC or VSIN with the AC parameter set, and sweeps the frequency parameters specified in the Simulation Profile, Start / End / Steps. You would need some form of VCO and a Transient Analysis if you wanted the frequencies controlled from a file. I would also say the the V- terminal on the uA741 is open and should be connected to a negative voltage, and the OS pins would be unconnected.