JPH0472729U - - Google Patents
Info
- Publication number
- JPH0472729U JPH0472729U JP11557290U JP11557290U JPH0472729U JP H0472729 U JPH0472729 U JP H0472729U JP 11557290 U JP11557290 U JP 11557290U JP 11557290 U JP11557290 U JP 11557290U JP H0472729 U JPH0472729 U JP H0472729U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- circuits
- tuner
- switching
- sets
- 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
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Superheterodyne Receivers (AREA)
Description
第１図は本考案の第１の実施例によるチユーナ
用ＩＣを適用したテレビチユーナの構成を示す回
路図、第２図は第１図のＩＣ１とＶＨＦ共振器１
０の要部の構成を示す回路図、第３図は本考案の
第２の実施例によるチユーナ用ＩＣを適用したテ
レビチユーナの構成を示す回路図、第４図は従来
のテレビチユーナの構成例を示すブロツク図、第
５図は第４図のＩＣ１とＶＨＦ共振器１０の要部
の構成を示す回路図である。
１……ＩＣ、１０……ＶＨＦ共振器、１７，２
２，２３……共振器端子、１８……ＵＨＦ共振器
、１９……ＵＨＦ発振回路、２０……ＵＨＦ混合
回路、２１……ＶＨＦ発振回路、２４……ＶＨＦ
混合回路、２８……Ｕ／Ｖ切換回路、４０，４２
……抵抗、４１……ダイオード、Ｉ……定電流回
路。
FIG. 1 is a circuit diagram showing the configuration of a television tuner to which a tuner IC according to the first embodiment of the present invention is applied, and FIG.
3 is a circuit diagram showing the configuration of a television tuner to which the tuner IC according to the second embodiment of the present invention is applied, and FIG. 4 is a circuit diagram showing the configuration of a conventional television tuner. The block diagram in FIG. 5 is a circuit diagram showing the configuration of the main parts of IC1 and VHF resonator 10 in FIG. 4. 1...IC, 10...VHF resonator, 17,2
2, 23...Resonator terminal, 18...UHF resonator, 19...UHF oscillation circuit, 20...UHF mixing circuit, 21...VHF oscillation circuit, 24...VHF
Mixing circuit, 28... U/V switching circuit, 40, 42
...Resistor, 41...Diode, I...Constant current circuit.
Claims (1)
備え、該複数組の回路の一組を動作状態にして使
用するチユーナ用ＩＣであつて、前記複数組の回
路の一組を択一的に動作状態に切り換える切換回
路を備え、該切換回路は、受信する周波数帯に応
じてこのＩＣの外部に設けられた共振回路をこの
ＩＣに接続する接続端の一つから切換制御信号が
加えられることを特徴とするチユーナ用ＩＣ。 (2) 前記複数組の回路は、周波数混合回路と局
部発振回路とを一組として備えていることを特徴
とする請求項１記載のチユーナ用ＩＣ。 (3) 前記複数組の回路は、その接地端に定電流
回路を備え、該定電流回路がオンおよびオフに切
り換えられることによつて動作および非動作に切
り換えられることを特徴とする請求項１記載のチ
ユーナ用ＩＣ。[Claims for Utility Model Registration] (1) A tuner IC comprising a plurality of sets of circuits according to frequency bands to be received, and which is used with one set of the plurality of circuits in an operating state, The switching circuit selectively switches one set of circuits into an operating state, and the switching circuit switches between a connecting end that connects a resonant circuit provided outside this IC to this IC depending on the frequency band to be received. A tuner IC characterized in that a switching control signal is applied from one. (2) The tuner IC according to claim 1, wherein the plurality of sets of circuits include a frequency mixing circuit and a local oscillation circuit as one set. (3) Claim 1, wherein the plurality of sets of circuits are provided with a constant current circuit at their ground terminals, and are switched into operation and non-operation by switching the constant current circuit on and off. IC for tuner described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11557290U JPH0472729U (en) | 1990-11-02 | 1990-11-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11557290U JPH0472729U (en) | 1990-11-02 | 1990-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0472729U true JPH0472729U (en) | 1992-06-26 |
Family
ID=31863348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11557290U Pending JPH0472729U (en) | 1990-11-02 | 1990-11-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0472729U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5513573A (en) * | 1978-07-14 | 1980-01-30 | Nec Corp | Multi-channel receiving circuit |
| JPS60149226A (en) * | 1984-01-14 | 1985-08-06 | Sony Corp | Tuner circuit |
-
1990
- 1990-11-02 JP JP11557290U patent/JPH0472729U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5513573A (en) * | 1978-07-14 | 1980-01-30 | Nec Corp | Multi-channel receiving circuit |
| JPS60149226A (en) * | 1984-01-14 | 1985-08-06 | Sony Corp | Tuner circuit |
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