problem is ads system simulation

i am using DF and Envelope together to simulate RF_front (SDC_AMFA_Cosim) and DSP, but i find out that while i change the parameters such as S21, NF in (SDC_AMFA_Cosim) , the result of the whole system do not change, such as demodulated output signal amplititute, it really puzzle me!

Is demodulated signal is in bits? Kindly share the setup.