开云体育

hi

i wanted to use fft in ltspice for a sin wave(schamtic attached with name as : fft_sine_wave) . i saw that i have other frequency in fft result, why?

second question: for a input signal with specific frequency, how value we select? total time and? time_step and number of sample?

third question : if fft used the values from transient analysis, the time step in tran. analysis effect result of fft and how?

thanks