I am trying to get the THD of an amplifier output in LTspice.
I used .four <freq> <signal> spice directive with .tran analysis and I can get the THD of a single ended signal..but i need THD of a differential signal..(LTspice just does not give anything when i try to enter a diff signal..)
does anyone know how to get the THD of a Diff Signal in LTspice??
btw..1 more question.. the THD on V+ and on V- is high..but that on [(V+) - (V-)] is lower....(LTspice shows a much lower voltage on even order harmonics for [(V+) - (V-)] )...
That's the way it is supposed to be right??
I can check if you show a circuit, but yes, it is perfectly possible. Some distortions (e.g. Second harmonic I think) can be cancelled out in complementary outputs.
VCVS is an E source. It is in LTspice simply as e. It has two inputs and two outputs so is differential in/differential out. If you ground one of the outputs you will effectively make it single ended out.