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Analog ElectronicsAnalog Signal Processing

An analog multiplier whose output is proportional to Vx times Vy can be used as a frequency doubler by applying the same sinusoid to both inputs because sin^2(theta) contains?

  • AA DC term and a component at twice the input frequency
  • BOnly the original frequency
  • COnly a component at half the frequency
  • DNo AC component
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Correct Answer: A. A DC term and a component at twice the input frequency
Explanation: sin²(theta)=[1-cos(2theta)]/2, so squaring a sinusoid produces a DC term and a second-harmonic component.
Reference: Standard analog electronics: analog multiplier
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