(Solved): a) Name the types of Operational amplifiers (OPAMPs) in below circuit diagrams of Figures A4.1 and ...

a) Name the types of Operational amplifiers (OPAMPs) in below circuit diagrams of Figures A4.1 and A4.2, respectively. [2 marks] b) For same Figures A4.1 and A4.2, compute the OPAMP gain, and then output voltage $$v_o$$ in terms of input $$v_i$$, respectively. (Hint: Consider linear region \& ideal OpAmp rules for both the circuits). For both the circuits, $$R_f=10?,R_s=5?$$. [7 marks] c) Name the amplifier provided in Figure A4.3 below. For inputs $$v_a(t),v_b(t)$$ and $$v_c(t)$$ we obtain the output voltage $$v_o(t)$$ which is given as $$v_o(t)=?3v_a(t)?4v_b(t)?8v_c(t)$$ Compute values of $$R_a,R_b$$ and $$R_c$$ (for $$R_f=10?$$ ). [4 marks]