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Amplifiers why to have large input impedance to an amplifier???????????

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Generally speaking, amplifiers are designed with high input impedance so they don't load down or distort the input signal. Vacuum tube and MOSFET input stages are characteristically high impedance. Of course high impedance inputs are susceptible to noise because of the ease with which currents are introduced by stray capacitance or direct electromagnetic field interaction.

Posted on Jan 01, 2009

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