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A patient monitoring system has three input sensors to monitor three different parameters of a patient. The output of the system is an alarm which

A patient monitoring system has three input sensors to monitor three different parameters of a patient. The output of the system is an alarm which will aware the medical team of a potential danger. Sensor A measures the blood pressure and produces a HIGH when the pressure falls below a threshold level. Sensor B measures the blood oxygen level and produces a HIGH when the oxygen level is below a threshold level. And sensor C measures the pulse rate which produces a HIGH when the pulse rate goes above a particular threshold level. Only in the following conditions, the alarm should be activated:

  1. If blood pressure is below threshold and oxygen level is below the threshold.
  2. If blood pressure is below threshold and pulse rate is above threshold.
  3. If oxygen level is below threshold and pulse rate is above threshold.
  4. If blood pressure is below threshold, oxygen level is below threshold and pulse rate is above threshold.

Design the alarm timer circuit with a frequency of 370 kHz and a duty cycle of 20%.

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