I am doing simualtion on a completely symmetrical differential circuit-Gilbert mixer.
When the input signal power is too large, the out put signal would be distorted because of the large signal nonlinearity effect. But the way the signal is distorted seems to be unresonable, the signals become unsymmetrical.
Re: Why does unsymmetric signals come out of a symmetric cir
Your circuit is not symetrical around horisontal axis.
Probably biasing points are not well established, or input signal is high enough to make transistors not work in active region.