Name:
April 1, 1997
Instructor: C. Davila

1. Consider the resistive displacement transducer shown below. The resistances and . Assume that the voltmeter internal resistance is and that the displacement takes on discrete values x=0, 0.2, 0.4, 0.6, 0.8, and 1. Find the independent nonlinearity, expressed as a percentage of the reading and as a percentage of full scale (x=1).
   

   

2. Design a capacitive microphone having a corner frequency of 10 Hz. Assume that the average capacitance is and the zero-displacement plate separation is mm. Sketch a Bode plot of the microphone's frequency response where is the peak sinusoidal displacement of the capacitor plates.
   

   

3. Briefly describe all of the electrophysiologic signals discussed in lecture. Discuss the signal source, how the signal is measured, and the diseases which can be diagnosed by looking at morphological changes in the signal.

4. Consider the following ECG measurement scenario:
   

   

   Assume that the electrode-electrolyte-skin interface can be modeled as:
   

   

   Assume that there is a parasitic capacitance of 10 pF between the electrode leads and the input impedance of the amplifier is . Ignore all other tissue and lead resistances. Sketch a Bode plot of the transfer function between the heart and the amplifier input voltage .

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