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Assume that we are designing a cardiac pacemaker circuit. The circuit is needed to deliver pulses of 1-ms duration to the heart which can be modeled as a 500 ohm resistance. The peak amplitude of the pulses is needed to be 5V. Though, the battery delivers just 2.5V. Thus, we decide to charge two equivalent value capacitors in parallel from the 2.5 V battery and then switch the capacitors in series with the heart all through the 1-ms pulse. Determine the minimum value of the capacitors needed so the output pulse amplitude remains between 4.9V and 5.0V all through its 1-ms duration? If the pulses take place once a second, then what is the average current drain from the battery? Use estimated computations supposing constant current throughout the output pulse. Determine the ampere-hour rating of the battery so it lasts for 5 years.

Q1. Design set of switches to satisfy the needs of the circuit.

Hint: Use discharging mode to find out the capacitors and charging mode to compute average current.

Q2. Draw the circuits and plots for discharging and charging mode with ALL voltages pointed.

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  • Category:- Physics
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