MEMS and sensors

What is an advantage of RF MEMS switches, which switch RF signals by mechanically opening and closing contacts?

  1. AThey are always faster than semiconductor switches
  2. BThey have no contacts, so there is no wear at all
  3. CThey switch with low insertion loss and little signal distortion
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Answer: C. They switch with low insertion loss and little signal distortion

An RF MEMS switch opens and closes contacts by mechanically moving a tiny electrode, so on-resistance and off-capacitance are small, keeping insertion loss and signal distortion low. On the other hand, switching is slower than semiconductor switches, and contact lifetime and reliability are challenges.

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More MEMS and sensors questions

  1. Which temperature sensor uses the property that its electrical resistance changes greatly with temperature?
  2. Which is the most appropriate scale for the movable structures made by MEMS?
  3. What is the principle of the optical sensor that measures heart rate at the wrist in smartwatches and similar devices?
  4. Which sensor does a smartphone use to automatically adjust screen brightness to its surroundings?
  5. What is the general principle of the sensor a smartphone uses to turn off the screen when your face approaches during a call, preventing accidental touches?