For the fully differential circuit in Fig. 12.32 a, assume the op amp is ideal with R i = , R o = 0, a

For the fully differential circuit in Fig. 12.32 a, assume the op amp is ideal with R_i= ˆž, R_o= 0, a_dm= ˆ’ ˆž, and a_cm= 0. Find the closed-loop gains A_dm= v_od/v_sd, A_cm= v_oc/v_sc, A_dmˆ’cm= v_oc / v_sd, and A_cmˆ’dm= v_od/ v_sc, under the following conditions.

(a) R₁ = R₂ = 1 kΩ and R₃ = R₄ = 5 kΩ.

(b) R₁ = 1.01 kΩ, R₂ = 0.99 kΩ, R₃ = R₄ = 5 kΩ.

Fig. 12.32(a):

R3 R1 Vod V sd R2 R4