Analog Multiplier with MOSFET - Implementation not working
What you have drawn bears little resemblance to the circuit you have linked to: -



Note how the output from the lower op-amp feeds back to both gates on the MOSFETs - this is fundamentally important to how the multiplier works in keeping stuff relatively linear - M2 is presumed to behave exactly like M1 but without the feedback your circuit will not behave correctly at all. 

Are you sure you know what you are trying to achieve?