A bipolar differential amplifier such as that shown in Fig. 9.36(a) has I = 0.4 mA, VA =40 V, and β = 150. Find Gm, Ro, Ad , and Rid . If the bias current source is implemented with a simple npn current mirror, find REE, Acm, and CMRR. If the amplifier is fed differentially with a source having a total of 30 kΩ resistance (i.e., 15 kΩ in series with the base lead of each of Q1:
and Q2: , find the overall differential voltage gain.