JPS574603A - Fm demodulator - Google Patents

Fm demodulator

Info

Publication number
JPS574603A
JPS574603A JP7825780A JP7825780A JPS574603A JP S574603 A JPS574603 A JP S574603A JP 7825780 A JP7825780 A JP 7825780A JP 7825780 A JP7825780 A JP 7825780A JP S574603 A JPS574603 A JP S574603A
Authority
JP
Japan
Prior art keywords
diodes
correction
voltage
difference
resistance
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.)
Granted
Application number
JP7825780A
Other languages
Japanese (ja)
Other versions
JPS6230527B2 (en
Inventor
Shiyouji Tawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP7825780A priority Critical patent/JPS574603A/en
Publication of JPS574603A publication Critical patent/JPS574603A/en
Publication of JPS6230527B2 publication Critical patent/JPS6230527B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/26—Demodulation of angle-, frequency- or phase- modulated oscillations by means of sloping amplitude/frequency characteristic of tuned or reactive circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To correct an unbalanced state of the diode characteristics, by inserting a correction voltage generating resistance for correction of the unblaned state and thus producing the bias voltage to shift the middle point of an S-shaped frequency characteristics curve. CONSTITUTION:If a difference of characteristics exists between diodes D1 and D2, the voltage is produced across a resistance R5 due to unbalanced current which is caused by the difference of characteristics of the diodes. This voltage is applied as a bias voltage for correction of a middle point of S-shaped frequency characteristics, and thus the S-shaped characteristics are shifted in the direction where the apparent resistance becomes equal between the diodes D1 and D2. As a result, an automatic correction is possible for an error due to the difference of characteristics between the diodes D1 and D2.
JP7825780A 1980-06-10 1980-06-10 Fm demodulator Granted JPS574603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7825780A JPS574603A (en) 1980-06-10 1980-06-10 Fm demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7825780A JPS574603A (en) 1980-06-10 1980-06-10 Fm demodulator

Publications (2)

Publication Number Publication Date
JPS574603A true JPS574603A (en) 1982-01-11
JPS6230527B2 JPS6230527B2 (en) 1987-07-02

Family

ID=13656931

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7825780A Granted JPS574603A (en) 1980-06-10 1980-06-10 Fm demodulator

Country Status (1)

Country Link
JP (1) JPS574603A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488120A (en) * 1982-03-12 1984-12-11 Northern Telecom Limited Frequency shift keying demodulator using a phase locked loop and voltage comparator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040061A (en) * 1973-08-14 1975-04-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040061A (en) * 1973-08-14 1975-04-12

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488120A (en) * 1982-03-12 1984-12-11 Northern Telecom Limited Frequency shift keying demodulator using a phase locked loop and voltage comparator

Also Published As

Publication number Publication date
JPS6230527B2 (en) 1987-07-02

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