Power Issues (cont’d)

• So what does this all mean?

• Duty cycle (and thus total power consumption) increases as speed increases

  • Somewhat expected. It’s doing more, and nothing is free.

• However, interesting to note that power per bit actually decreases as speed increases

  • IrDA’s higher-speed modulation schemes more efficient

• Hard Numbers:

  • Around 5 mW during operation (at 1 Mbps)
  • Can often go into shutdown mode when not in use
  • Compare: around 100 mW for typical RF

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