Electronworks
New Member
Hi
I am designing an audio amplifier with LT SPICE. If I do an FFT of the output, I get a lot of harmonics appearing. Lo-Fi you might say..
However, if I disconnect the sinewave input and put a probe on the (completely unloaded) sinewave output, I still get the same harmonic content (second and third harmonics especially, but lots of high order harmonics up in the MHz region).
Any idea what I am doing wrong? Surely i should just get a single spur at 1kHz for a 1kHz input, or has theory changed since I leant it all....?
Please help
Thanks
I am designing an audio amplifier with LT SPICE. If I do an FFT of the output, I get a lot of harmonics appearing. Lo-Fi you might say..
However, if I disconnect the sinewave input and put a probe on the (completely unloaded) sinewave output, I still get the same harmonic content (second and third harmonics especially, but lots of high order harmonics up in the MHz region).
Any idea what I am doing wrong? Surely i should just get a single spur at 1kHz for a 1kHz input, or has theory changed since I leant it all....?
Please help
Thanks