Ri Figure P11.46 and Q₂, show that Rp. VDD Q2 RE ww ° R₁. X RM 2 A= 802RD 1+1/18 (R+R)] (d) Find an expression for the closed-loop gain A,. (e) For 882-4 mA/V, R, = 10 k2, and R₂ = 1 kQ, find the value of Ry, that results in a closed-loop gain of -5 A/A. Compare to the value found in (a)./nD11.46 Figure P11.46 shows a feedback current amplifier. The feedback network consists of the highlighted two-port network comprising Ry and R,. It is fed with the output current I, and delivers a feedback current I, at its port 1 to the input node. (a) By setting the open-loop gain to oc, which results in 1,0 and hence V,=0, show that the ideal closed-loop gain is A==(1+2) Selecting R, 1 kQ, find Ry, that results in an ideal closed-loop gain of -5 A/A. (b) Find an expression for ẞ. (c) Setting 1, 0, break the loop at the gate of Q, and thus determine the loop gain Aẞ. Neglecting r, of each of Q

Fig: 1

Fig: 2