JPS5619218A - Tuning voltage output circuit - Google Patents

Tuning voltage output circuit

Info

Publication number
JPS5619218A
JPS5619218A JP9374679A JP9374679A JPS5619218A JP S5619218 A JPS5619218 A JP S5619218A JP 9374679 A JP9374679 A JP 9374679A JP 9374679 A JP9374679 A JP 9374679A JP S5619218 A JPS5619218 A JP S5619218A
Authority
JP
Japan
Prior art keywords
voltage
afc
tuning voltage
tuning
channel
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
JP9374679A
Other languages
Japanese (ja)
Other versions
JPS6248930B2 (en
Inventor
Toshinori Murata
Shigeo Matsuura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9374679A priority Critical patent/JPS5619218A/en
Publication of JPS5619218A publication Critical patent/JPS5619218A/en
Publication of JPS6248930B2 publication Critical patent/JPS6248930B2/ja
Granted 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
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/22—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element in which an automatic frequency control circuit is brought into action after the scanning action has been stopped

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To keep the tuning voltage of the channel to the change of the electric field under reception, by dividing the state of the AFC voltage into three types, i.e. the charging, discharging and holding states and then keeping these three states to the tuning voltage. CONSTITUTION:The AFC output of AFC generating circit 15 is transmitted to transistors TR37, 39 which function as the voltage deciding circuit. And the AFC voltage is about 6V as long as the tuning voltage is proper after discontinuation of the sweep and the local oscillation frequency of the electronic tuner has a proper value. Thus TR37, 39 are turned off and on respectively. As a result, both TR38, 40 are turned off to prevent the charging/discharging to capacitor 20 and thus to hold the tuning voltage. Accordingly, the AFC voltage can keep about 6V although no broadcasting wave exists to secure the same state as the case in which the optimum tuning point is obtained. Thus the steady tuning voltage of the channel can be kept although the electric field may change under reception to eliminate the second selection of the channel.
JP9374679A 1979-07-25 1979-07-25 Tuning voltage output circuit Granted JPS5619218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9374679A JPS5619218A (en) 1979-07-25 1979-07-25 Tuning voltage output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9374679A JPS5619218A (en) 1979-07-25 1979-07-25 Tuning voltage output circuit

Publications (2)

Publication Number Publication Date
JPS5619218A true JPS5619218A (en) 1981-02-23
JPS6248930B2 JPS6248930B2 (en) 1987-10-16

Family

ID=14090980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9374679A Granted JPS5619218A (en) 1979-07-25 1979-07-25 Tuning voltage output circuit

Country Status (1)

Country Link
JP (1) JPS5619218A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758529A (en) * 1985-10-31 1988-07-19 Rca Corporation Method of forming an improved gate dielectric for a MOSFET on an insulating substrate

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS528717A (en) * 1975-07-10 1977-01-22 Toshiba Corp Automatic channel selecteor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS528717A (en) * 1975-07-10 1977-01-22 Toshiba Corp Automatic channel selecteor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758529A (en) * 1985-10-31 1988-07-19 Rca Corporation Method of forming an improved gate dielectric for a MOSFET on an insulating substrate

Also Published As

Publication number Publication date
JPS6248930B2 (en) 1987-10-16

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