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What is the problem with a single operational high frequency response of differential amplifier?(a) High input resistance(b) Low input resistance(c) Low output resistance(d) High output resistanceI have been asked this question in an internship interview.Question is taken from High Frequency Response of the Differential Amplifiers topic in section Frequency Response of Electronic Devices & Circuits

Answer» CORRECT option is (b) Low input resistance

Easy explanation: The PROBLEM with a single operational high frequency RESPONSE of DIFFERENTIAL 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 High frequency response of differential amplifier with features like High Input Impedance, Low Output Impedance.


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