D11.5 RD1 12 ΚΩ RD2 12 ΚΩ ā Rout RF ww V₁ R$2 R$1 120 2 120 Rout Figure 11.5.1 Figure 11.5.1 shows a series-shunt feedback amplifier known as a "feedback triplet." All three MOSFETs are biased to operate at gm = 5 mA/V. You may neglect their ro's. (a) Select a value for RF that results in a closed- loop gain Vo/Vs that is ideally 12 V/V. (b) Determine the loop gain Aẞ and hence the value of Vo/Vs. By what percent does the closed- loop voltage gain differ from the value you designed for? How can you adjust the circuit to make As equal to 12?

Fig: 1