D 9.25 For the cascode differential amplifier of Fig. 9.13(a), show that if all transistors have the same channel length and are operated at the same VOV and assuming that VAn = VAp = V A , the differential gain Ad is given by A d = 2 VA VOV 2 Now design the amplifier to obtain a differential gain of 500 V/V. Use VOV = 0.2 V. If VA = 5 V/μm, specify the required channel length L. If gm is to be as high as possible but the power dissipation in the amplifier (in equilibrium) is to be limited to 0.5 mW, what bias current I would you use? Let V DD = VSS = 0.9 V.

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