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JPS5710506A - Am demodulation circuit - Google Patents

Am demodulation circuit

Info

Publication number
JPS5710506A
JPS5710506A JP8396680A JP8396680A JPS5710506A JP S5710506 A JPS5710506 A JP S5710506A JP 8396680 A JP8396680 A JP 8396680A JP 8396680 A JP8396680 A JP 8396680A JP S5710506 A JPS5710506 A JP S5710506A
Authority
JP
Japan
Prior art keywords
waveform
point
signal
envelope
positive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8396680A
Other languages
Japanese (ja)
Inventor
Tetsuo Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP8396680A priority Critical patent/JPS5710506A/en
Publication of JPS5710506A publication Critical patent/JPS5710506A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/02—Details
    • H03D1/06—Modifications of demodulators to reduce distortion, e.g. by negative feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To eliminate the distortion due to nonlinearity of a diode, by adding a base band signal equal to the envelope of an AM signal to the AM signal in opposite phase to keep the operating point of detection constant at all times. CONSTITUTION:A waveform (c) in opposite phase of the positive envelope of the waveform at the point A is superimposed on an AM signal waveform (a) at the point A at an input terminal 11, at an addition circuit 25, and the positive envelope of a waveform (b) at the point B is a straight line without being unchanged. Then, in a modulation signal frequency for the AM modulation signal, an inverting amplifying circuit 27 is operated toward the direction that the variance in the detected voltage is smaller, by taking the envelope detecting characteristics (positive) as (d), and the waveform at the point C is given. In this case, the waveform at the point C is equal to the inverse phase of the envelope waveform at the positive side of the AM signal at the point A entirely, and this is outputted to an output terminal 24 as the AM demodulation output.
JP8396680A 1980-06-23 1980-06-23 Am demodulation circuit Pending JPS5710506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8396680A JPS5710506A (en) 1980-06-23 1980-06-23 Am demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8396680A JPS5710506A (en) 1980-06-23 1980-06-23 Am demodulation circuit

Publications (1)

Publication Number Publication Date
JPS5710506A true JPS5710506A (en) 1982-01-20

Family

ID=13817284

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8396680A Pending JPS5710506A (en) 1980-06-23 1980-06-23 Am demodulation circuit

Country Status (1)

Country Link
JP (1) JPS5710506A (en)

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