JPS5596737A - Electronic tuning unit - Google Patents

Electronic tuning unit

Info

Publication number
JPS5596737A
JPS5596737A JP362379A JP362379A JPS5596737A JP S5596737 A JPS5596737 A JP S5596737A JP 362379 A JP362379 A JP 362379A JP 362379 A JP362379 A JP 362379A JP S5596737 A JPS5596737 A JP S5596737A
Authority
JP
Japan
Prior art keywords
circuit
frequency
variable capacity
voltage variable
output
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
JP362379A
Other languages
Japanese (ja)
Inventor
Kenji Ichida
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP362379A priority Critical patent/JPS5596737A/en
Publication of JPS5596737A publication Critical patent/JPS5596737A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
    • H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To use a pre-scaler to operate an electronic tuning unit without lowering of the frequency even if a C-MOS circuit is used to make power consumption low, by controlling the frequency of 16kHz or less in the PLL circuit independent of a local oscillation circuit. CONSTITUTION:A tuner part is constituted by tuning circuit 1 using a voltage variable capacity element, local oscillation circuit 6 using a voltage variable capacity element, mixer circuit 2 and intermediate frequency amplifier circuit 3. Meanwhile, PLL circuit 7 is constituted by voltage control oscillation circuit 7-1, frequency divider circuit 7-2, comparator circuit 7-3 which compares a reference frequency with the frequency division output in phase, and a means which feeds back the output of comparator circuit 7-3 to oscillation circuit 7-1. Then, the voltage variable capacity of the tuner part is controlled by the control voltage which controls the voltage variable capacity of PLL circuit 7, and further, the frequency division ratio of the frequency divider circuit of PLL circuit 7 is controlled by the output signal of detection circuit 9 which detects receiving sensitivity on a basis of the output of the tuner part.
JP362379A 1979-01-16 1979-01-16 Electronic tuning unit Pending JPS5596737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP362379A JPS5596737A (en) 1979-01-16 1979-01-16 Electronic tuning unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP362379A JPS5596737A (en) 1979-01-16 1979-01-16 Electronic tuning unit

Publications (1)

Publication Number Publication Date
JPS5596737A true JPS5596737A (en) 1980-07-23

Family

ID=11562618

Family Applications (1)

Application Number Title Priority Date Filing Date
JP362379A Pending JPS5596737A (en) 1979-01-16 1979-01-16 Electronic tuning unit

Country Status (1)

Country Link
JP (1) JPS5596737A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7782101B2 (en) 2008-04-03 2010-08-24 National Taiwan University Of Science And Technology Injection-locked frequency divider

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7782101B2 (en) 2008-04-03 2010-08-24 National Taiwan University Of Science And Technology Injection-locked frequency divider

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