9.87 The differential amplifier of Fig. 9.32(a) is biased with I = 200 μA. All transistors have L = 0.5 μm, and Q1 and Q2 have W/L = 50. The circuit is fabricated in a process for which μnCox = 200 μA/V2 and |VA| = 5 V/μm. Find gm1,2, ro 2, ro4, and Ad.