JPH0356220U - - Google Patents
Info
- Publication number
- JPH0356220U JPH0356220U JP11626589U JP11626589U JPH0356220U JP H0356220 U JPH0356220 U JP H0356220U JP 11626589 U JP11626589 U JP 11626589U JP 11626589 U JP11626589 U JP 11626589U JP H0356220 U JPH0356220 U JP H0356220U
- Authority
- JP
- Japan
- Prior art keywords
- switching
- band switching
- connection
- circuit
- voltage
- 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
Links
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の第１実施例であるＴＶチユー
ナのＶＨＦ帯ＲＦ増幅部、第２図は第２実施例の
ＴＶチユーナのＶＨＦ帯ＲＦ増幅部および局部発
振部を構成した例を示し、第３図、第４図は、そ
れぞれ第１実施例（第１図）、第２実施例（第２
図）に対応する従来例である。
Ｑ１，Ｑ２…ＭＯＳＦＥＴ、ｌ１〜ｌ４，ｌ５
〜ｌ１０…コイル、ｄ１，ｄ３，ｄ５，ｄ７，ｄ
１０…バラクタダイオード、ｄ２，ｄ４，ｄ６，
ｄ８，ｄ９…スイツチングダイオード、ＶＢ…電
源供給端子、ＶＳＷ…切替制御端子。
FIG. 1 shows a VHF band RF amplification section of a TV tuner according to a first embodiment of the present invention, and FIG. 2 shows an example of a configuration of a VHF band RF amplification section and a local oscillation section of a TV tuner according to a second embodiment. FIG. 3 and FIG. 4 respectively show the first embodiment (FIG. 1) and the second embodiment (FIG. 2).
This is a conventional example corresponding to Fig. Q1 , Q2 ...MOSFET, l1 to l4 , l5
~l 10 ... coil, d 1 , d 3 , d 5 , d 7 , d
10 ... Varactor diode, d 2 , d 4 , d 6 ,
d8 , d9 ...Switching diode, VB...Power supply terminal, VSW...Switching control terminal.
Claims (1)
路のバンド切替用スイツチングダイオードの一方
の電極および前記チユーナ回路の増幅素子に、電
源供給端子から一定の電圧を供給する結線と、前
記スイツチングダイオードの他方の電極に外部か
らバンド切替用電圧を導く結線とを備え、前記バ
ンド切替用電圧を変えることにより、バンド切替
を行なうことを特徴とするバンド切替用スイツチ
ング回路。 In a VHF TV tuner circuit, a connection for supplying a constant voltage from a power supply terminal to one electrode of a band switching switching diode of a tuned resonant circuit and an amplifier element of the tuner circuit, and a connection to the other electrode of the switching diode. 1. A switching circuit for band switching, comprising a connection for introducing a voltage for band switching from the outside, and performing band switching by changing the band switching voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11626589U JPH0356220U (en) | 1989-10-02 | 1989-10-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11626589U JPH0356220U (en) | 1989-10-02 | 1989-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0356220U true JPH0356220U (en) | 1991-05-30 |
Family
ID=31664547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11626589U Pending JPH0356220U (en) | 1989-10-02 | 1989-10-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0356220U (en) |
-
1989
- 1989-10-02 JP JP11626589U patent/JPH0356220U/ja active Pending
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