6. Design a circuit where the output voltage will be the difference between two input voltages, connected by named nets Va and Vb (the sources to be named VA and VB

respectively), multiplied by J. The output, Vout, should be J (Vb - Va). The output should also be independent of the source resistances of the inputs (see Figure 1 for setting source resistances). It is also a requirement that the gain of the circuit be adjustable using only one resistor, which must be labelled Rg. The named net for the output voltage must be Vout. The common mode rejection ratio (CMRR) must be infinite. [20 marks]