The differential amplifier circuit of Fig. P9.61 utilizes a resistor connected to the

Chapter 9, Problem 9.61

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The differential amplifier circuit of Fig. P9.61 utilizes a resistor connected to the negative power supply to establish the bias current I. (a) For vB1 = vid /2 and vB2 =vid /2, where vid is a small signal with zero average, find the magnitude of the differential gain, vo/vid . (b) For vB1 = vB2 = vicm, where vicm has a zero average, find the magnitude of the common-mode gain, vo/vicm . (c) Calculate the CMRR. (d) If vB1 =0.1 sin 2 60t + 0.005 sin 2 1000t, volts, and vB2 =0.1 sin 2 60t 0.005 sin 2 1000t, volts, find vo. Figure P9.61

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