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In a Single Input Balanced Output Differential amplifier, given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain

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in Linear Integrated Circuits by (39.8k points)
In a Single Input Balanced Output Differential amplifier, given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain

(a) 26

(b) 56

(c) 38

(d) 61

I got this question in an international level competition.

This interesting question is from Differential Amplifier and Circuit Configuration topic in division Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Accurate option is (a) 26

Paint a vivid picture of understanding with: In single Input Balance Output amplifier,

⇒ IE = (VEE-VBE)/2RE

      =(15v-0.7v)/(2×3.9kom)=  1.83mA  (∵VCC=VEE)

From the equation, VCE = VCC +VBE-RC×IC

⇒ RC = (14.3v – 2.4v)/1.83mA = 6.5kΩ

The voltage gain, Vo

⇒ Vo = RC/re

      = 6.5kΩ/250Ω = 26(no units).

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