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What is the application of a high input resistance transistor amplifier circuit amplifier?

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What is the application of a high input resistance transistor amplifier circuit amplifier?

(a) Positive feedback

(b) Voltage gain

(c) Power gain

(d) Impedance matching

I have been asked this question during an interview.

The doubt is from High Input Resistance Transistor Circuit in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct choice is (d) Impedance matching

Easy explanation: The high input impedance and resistance along with low output impedance makes the transistor amplifier circuit amplifier ideal for impedance matching. Along with that, its key characteristics include a comparatively high current and power gain.

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