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Question 423

What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?

Schematic of a circuit with a triangular three-terminal component, resistor R1 at the input, and resistor RF connecting output to input.
  1. High-pass filter
  2. Low-pass filterBonne réponse
  3. Band-pass filter
  4. Notch filter

Explication

The circuit is an inverting amplifier whose gain magnitude is the impedance of the feedback branch divided by R1. Putting a capacitor across RF makes that impedance fall as frequency rises, so gain falls with increasing frequency, which is a low-pass response.

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