The change in the value of the emitter resistance RE in

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The change in the value of the emitter resistance R_E in a difference amplifier:

1. affects the difference mode gain, A_d
2. affects the common mode gain, A_c
3. affects both A_d and A_c
4. does not affect either A_d and A_c

Correct Option: B

A_CM =	–h_fe · R_c
	h_ie + R_s + (1 + h_fe)R_E

and A_DM =	1	×	–h_fe·R_c
	2		(R_s + h_ie)

Hence alternative (B) is the correct choice.