The differential amplifier circuit of Figure Q.2 utilizes a resistor c

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The differential amplifier circuit of Figure Q.2 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|. [8 marks] b) For vB1 = vB2 = vicm, where vicm has a zero average, find the magnitude of the common-mode gain, |vo/vicm|. [8 marks] c) If vB1 = 0.1 sin⁡2π×60t + 0.005 sin⁡2π×1000t volts, and vB2 = 0.1 sin⁡2π×60t − 0.005 sin⁡2π×1000t volts, find vo. [4 marks] Figure Q. 2

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The differential amplifier circuit of Figure Q. 2 utilizes a resistor connected to the negative power supply to establish the bias current

I

. a) For

v_{B 1} = v_{i d} / 2

and

v_{B 2} = - v_{i d} / 2

, where

v_{i d}

is a small signal with zero average, find the magnitude of the differential gain,

| v_{o} / v_{i d} |

. [8 marks] b) For

v_{B 1} = v_{B 2} = v_{i c m}

, where

v_{i c m}

has a zero average, find the magnitude of the common-mode gain,

| v_{o} / v_{i c m} |

. [8 marks] c) If

v_{B 1} = 0.1 \sin 2 π \times 60 t + 0.005 \sin 2 π \times 1000 t

volts, and

v_{B 2} = 0.1 \sin 2 π \times 60 t - 0.005 \sin 2 π \times 1000 t

volts, find

v_{o}

. [4 marks] Figure Q. 2

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