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Compute the output voltage from the following circuit diagram?

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+1 vote
in Linear Integrated Circuits by (37.1k points)
Compute the output voltage from the following circuit diagram?

(a) -17v

(b) -27v

(c) -39v

(d) -15v

This question was posed to me in a national level competition.

This interesting question is from Differential Amplifiers with Multiple Op-Amp topic in portion Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Accurate choice is (b) -27v

Break it down: Since VB=0, the configuration becomes as an inverting amplifier. Hence, the output due to VA is

Vo  = -(RF/R1)*VA  = -(15kΩ/1.5kΩ)*2.7v = -10*2.7 = -27v.

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