My design is 2nd order/104 OSR/5 level quantizer sigma delta ADC.
Simulation of 2 tone shows distortions, and the energy of IM7 is larger than IM5, meanwhile, the energy of IM5 is larger than IM3.
Also, there is lM2 and IM2 energy is 6dB less than IM3.
For other circuits, such as opamp, the max energy should be IM3.
I wander which kind of non-ideality can cause larger IM5 and IM7