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Question 405

What occurs when the input signal levels to a mixer are too high?

  1. Spurious mixer products are generatedCorrect answer
  2. Mixer blanking occurs
  3. Automatic limiting occurs
  4. Excessive AGC voltage levels are generated

Explanation

A mixer behaves linearly only up to a level set by its local-oscillator drive and its devices. Beyond that point the higher-order mixing terms grow rapidly, and additional spurious products, including intermodulation between strong signals, appear at the output.

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