Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Question

Describe an application in which an amplifier with very high input impedance is needed.

Expert Solution
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Step 1
  • A ECG amplifier should be high input impedance.
  • It is a amplifier that amplifies and record the small voltages which is generated by a person’s heart.
  • So whenever placed the electrodes on the person’s skin then voltage is detected. And impedance is vary man to man.
  • So, when input impedance of ECG is low then a variable voltage occurs because of loading.
  • The signal can be affected by contact resistance of the electrodes with the skin.
  • That’s why it does not surely represent the electrical activity of the heart.
  • And when input impedance is high than the source impudence, the actual voltage produced by heart and appears at input terminals.
  • That why input impedance of an ECG should be high.
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