Amplifier Input Impedance

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In this electrical engineering tutorial, I analyze the input impedance for an ideal inverting and ideal non-inverting operational amplifier circuit. Input impedance is an important design consideration when choosing an amplifier. Choosing an amplifier with a high input impedance prevents the loading affect at the input of your amplifier circuit. This can help in cases especially when your input a high equivalent series resistance.
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  3. Simply Circuits
  4. Op Amp
  5. Operational Amplifier
  6. Inverting amplifier
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Sounds like a nonsense for me. If ideal opamp has infinite input resistance, you, in fact, have voltage divider which consists of 1k resisotor and infinite input impedance resistor and due to voltage divider formula voltage drop across 1k resistor should be small, not Vin. All this opamp circuits seem to be completely magic.

torcher