Driving a circuit with spice models using verilog wreal stimulus

 Hi All,

 I am running an AMS simulation [IRUN] where circuit with spice components is being driven by a stimulus code written in verliogams wreal.

Here when circuit is fully operational my supply coming from stimulus dips to about 200mV {VDDA - 200mV} [ Due to loading from the circuit]

Can anyone suggest me some idea to drive this circuit using wreal stimulus without facing any loading issue for supply provided by the stimulus.

Thanks in advance

Regards