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From the circuit, determine the output voltage (Assume αF=1)

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in Linear Integrated Circuits by (37.1k points)
From the circuit, determine the output voltage (Assume αF=1)

(a) VO1=3.9v ,  VO2=12v

(b) VO1=12v ,  VO2=3.9v

(c) VO1=12v ,  VO2=0v

(d) VO1=3.9v ,  VO2=-3.9v

This question was addressed to me in my homework.

The origin of the question is Operational Amplifier Internal Circuit in portion Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
The accurate answer is (b) VO1=12v ,  VO2=3.9v

In the realm of explanation: The voltage at the common emitter ‘E’ will be -0.7v, which make Q1 off and the entire current will flow through Q2.

⇒ VO1 = VCC  VO2= VCC-αF×IQ×RC,

⇒ VO1 = 12v , VO2=12v-1×3mA×2.7k = 3.9v.

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