JPS55147823A - Electronic tuning circuit - Google Patents

Electronic tuning circuit

Info

Publication number
JPS55147823A
JPS55147823A JP5588079A JP5588079A JPS55147823A JP S55147823 A JPS55147823 A JP S55147823A JP 5588079 A JP5588079 A JP 5588079A JP 5588079 A JP5588079 A JP 5588079A JP S55147823 A JPS55147823 A JP S55147823A
Authority
JP
Japan
Prior art keywords
frequency
mixer
output
voltage
afc
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
JP5588079A
Other languages
Japanese (ja)
Inventor
Yukio Kurioka
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.)
Denso Ten Ltd
Original Assignee
Denso Ten 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 Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP5588079A priority Critical patent/JPS55147823A/en
Publication of JPS55147823A publication Critical patent/JPS55147823A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To make it possible to adopt only merit of the conventional voltage synthesizer system and the PLL frequency synthesizer system, by interposing the second mixer between the first mixer for intermediate frequency conversion and a PLL and supplying the output of a frequency variable oscillator, which has the oscillation frequency controlled by the AFC voltage from the IF stage, to this mixer. CONSTITUTION:The second mixer 10 and frequency variable oscillator (VFO) 11 are provided further. Mixer 10 is interposed between the first mixer 3 and the PLL, and mixes output fPLL of voltage control oscillator (VCO) 5 and output fAFC of VFO11. Oscillation frequency fAFC of VFO11 is controlled by AFC output (voltage) VAFC of IF stage 4, and the fundamental frequency is controlled by the AFC voltage. As a result, degradation of tone quality and so on is not generated and the indicated frequency based on fPLL agrees with receiving frequency fANT in case of tuning slippage. Meanwhile, when the tuning frequency of IF stage 4 is shifted, AFC output VAFC appears, and VFO11 changes the frequency so that VAFC=0 may be true.
JP5588079A 1979-05-08 1979-05-08 Electronic tuning circuit Pending JPS55147823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5588079A JPS55147823A (en) 1979-05-08 1979-05-08 Electronic tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5588079A JPS55147823A (en) 1979-05-08 1979-05-08 Electronic tuning circuit

Publications (1)

Publication Number Publication Date
JPS55147823A true JPS55147823A (en) 1980-11-18

Family

ID=13011404

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5588079A Pending JPS55147823A (en) 1979-05-08 1979-05-08 Electronic tuning circuit

Country Status (1)

Country Link
JP (1) JPS55147823A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673495A1 (en) * 1991-02-28 1992-09-04 Alcatel Telspace FREQUENCY TRANSPOSITION DEVICE WITH AUTOMATIC FREQUENCY CONTROL.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673495A1 (en) * 1991-02-28 1992-09-04 Alcatel Telspace FREQUENCY TRANSPOSITION DEVICE WITH AUTOMATIC FREQUENCY CONTROL.

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