申論題

2. (25%) As shown in Fig. 2, a bipolar differential amplifier utilizes a current source (i.e., a single CE transistor Q₅) to supply a bias current 240 µA, and current-source loads formed by pnp transistors (Q₃and Q₄). For all transistors, β = 100 and early voltage |V_A| = 10 V. Find (a) gm of Q₁, (b) differential gain A_d, (c) input resistance of differential mode R_id and common mode R_icm, (d) CMRR(dB) if the two load transistors exhibit a 1% mismatch in their ro. Thermal voltage is 25 mV. (5%*5)