Modulating Carriers

Quick Quiz made from the OCR textbook about modulation.

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  • Created by: Taviline
  • Created on: 04-12-14 21:23

1. What is AM?

  • The opposite of PM
  • When a high frequency carrier wave has a proportional amplitude voltage dependent on a signal.
  • When the amplitude of the signal is changed by a high frequency carrier wave.
  • When a high frequency wave's amplitude is cut by a signal wave.
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2. What does a diode detector do in demodulation?

  • Creates a steady signal.
  • Outputs a D.C. voltage that follows the signal peak value.
  • Biases the signal so that the MOSFET can receive all of it.
  • Stops current flowing back into the rectifier.

3. What are the disadvantages of using digital signals to transmit signals?

  • Slow and limited data transfer
  • Easily affected by noise
  • Too big and expensive to make
  • Digital signals are hard too transmit

4. What does a multiplexer do in FM?

  • Lets the schmitt trigger produce a square wave.
  • Allows the ramp generator to produce a triangle wave.
  • Lets you chose which signal to transmit.
  • Lets the schmitt trigger produce a triangle wave.

5. How is frequency changed in FM?

  • An external switch.
  • The signal voltage determines the ramp generator rate, which controls the schmitt trigger
  • The signal frequency determines the ramp rate, which controls the schmitt trigger.
  • The resistor values in the schmitt trigger and ramp generator.
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