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What is the problem with a single operational difference amplifier?(a) High input resistance(b) Low input resistance(c) Low output resistance(d) High output resistanceI have been asked this question in a national level competition.My doubt is from Transistor Difference Amplifiers in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The correct CHOICE is (b) Low INPUT resistance

The explanation: The problem with a single operational difference amplifier is its low input resistance. This low input resistance results in a loss of a major component of the signal. Operational Amplifier is INTERNALLY a Differential Amplifier with FEATURES like High Input Impedance, Low OUTPUT Impedance.



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