In the given block diagram of an op-amp. What are A, B, C and D?(a) A = Dual input and balanced output differential amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Power amplifier(b) A = Dual input and balanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Dual input and unbalanced output differential amplifier, D = Normal amplifier(c) A = Dual input and unbalanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Voltage regulator, D = Power amplifier(d) A = Normal amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Dual input and balanced output differential amplifierThe question was posed to me in an interview.This intriguing question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits

In the given block diagram of an op-amp. What are A, B, C and D?(a) A

1.	In the given block diagram of an op-amp. What are A, B, C and D?(a) A = Dual input and balanced output differential amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Power amplifier(b) A = Dual input and balanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Dual input and unbalanced output differential amplifier, D = Normal amplifier(c) A = Dual input and unbalanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Voltage regulator, D = Power amplifier(d) A = Normal amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Dual input and balanced output differential amplifierThe question was posed to me in an interview.This intriguing question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits
Answer» Correct answer is (a) A = Dual input and balanced OUTPUT differential amplifier, B = Dual input and UNBALANCED output differential amplifier, C = Level shifter, D = Power amplifier The best I can explain: The correct BLOCK diagram is

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