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Demodulator for amplitude modulated signal having high input impedance

  • US 4,319,195 A
  • Filed: 10/11/1979
  • Issued: 03/09/1982
  • Est. Priority Date: 10/11/1978
  • Status: Expired due to Term
First Claim
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1. A demodulator comprising:

  • an input terminal adapted to receive an amplitude modulated signal of a carrier signal;

    means for deriving two intermediate output signals in response to said amplitude modulated signal, said two intermediate output signals having different phases from each other;

    a first and a second transistor having their respective emitters connected in common, a base of said first transistor receiving one of said intermediate output signals, and a base of said second transistor receiving the other of said intermediate output signals;

    an emitter follower transistor having a base exclusively connected to the emitters of said first and said second transistors the total capacitance of the parasitic capacitors associated with the emitters of said first and second transistors and the base of said emitter follower transistor being of a value sufficient for smoothing said carrier signal; and

    an output terminal coupled to an emitter of said emitter follower transistor.

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