JPS5619218A - Tuning voltage output circuit - Google Patents
Tuning voltage output circuitInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS528717A (en) * | 1975-07-10 | 1977-01-22 | Toshiba Corp | Automatic channel selecteor |
-
1979
- 1979-07-25 JP JP9374679A patent/JPS5619218A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS528717A (en) * | 1975-07-10 | 1977-01-22 | Toshiba Corp | Automatic channel selecteor |
Cited By (1)
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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