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Amplitude to DC

  1. Mar 11, 2009 #1
    My scenario:
    LNA 433MHz signal (21dB) from antenna and the difference between the two signals with a 4.1dB gain. I would like to take the result of the difference amplifier an produce a DC value that is proportional to the output.

    Question 1:
    What type of circuit would lower the frequency to something like 50MHz?

    Question 2:
    What type of circuit would take the amplitude of a 50MHz sine wave signal and convert it to a DC voltage that is proportional?

    Many thanks!
  2. jcsd
  3. Mar 11, 2009 #2
    Answer 1:
    A mixer

    Answer 2:
    A detector diode.
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