(Solved): 4) (5 points) A differential instrumentation amplifier is shown in the figure below. The two input ...

4) (5 points) A differential instrumentation amplifier is shown in the figure below. The two inputs are $$V_{in1}$$ and $$V_{in2}$$, which is each coupled to common-mode voltage $$V_{CM}$$. Assume that all resistors except for $$R_G$$ are equal to $$R$$. a. Find an expression of the output voltage $$V_{\text{out }}$$ as a function of the input voltages and the resistors. b. What is the closed-loop gain of the amplifier if $$R=25\mathrm{k}?$$ and $$R_G=100\mathrm{k}?$$ ?