JPH01117133U - - Google Patents
Info
- Publication number
- JPH01117133U JPH01117133U JP1296888U JP1296888U JPH01117133U JP H01117133 U JPH01117133 U JP H01117133U JP 1296888 U JP1296888 U JP 1296888U JP 1296888 U JP1296888 U JP 1296888U JP H01117133 U JPH01117133 U JP H01117133U
- Authority
- JP
- Japan
- Prior art keywords
- variable
- tuner device
- series
- parallel
- capacitance diode
- 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
- 239000003990 capacitor Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 1
Landscapes
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は本考案を実施したチユーナ装置の要部
回路図、第２図は本考案の効果を説明するための
図、第３図は本考案を実施したトラツプ部の他の
実施例を示す回路図、第４図は従来のチユーナ装
置の回路図である。
Ｄ１，Ｄ４，Ｄ６……スイツチングダイオード
、Ｄ２，Ｄ３，Ｄ５……可変容量ダイオード、ａ
……アンテナ端子、ｂ，ｈ……チユーニング電圧
用端子、ｄ，ｅ……ＶＨＦローバンド受信用端子
、ｆ，ｇ……ＶＨＦハイバンド受信用端子、ＴＲ
１……ＲＦアンプ用トランジスタ、Ｅ……段間同
調回路、Ｆ……ミキサー回路、Ｇ……局部発振回
路、Ｈ……ＩＦ増幅回路。
Fig. 1 is a circuit diagram of the main part of a tuner device implementing the present invention, Fig. 2 is a diagram for explaining the effects of the present invention, and Fig. 3 shows another embodiment of a trap section implementing the present invention. Circuit Diagram FIG. 4 is a circuit diagram of a conventional tuner device. D 1 , D 4 , D 6 ... Switching diode, D 2 , D 3 , D 5 ... Variable capacitance diode, a
...Antenna terminal, b, h...Tuning voltage terminal, d, e...VHF low band reception terminal, f, g...VHF high band reception terminal, TR
1 ...RF amplifier transistor, E...interstage tuning circuit, F...mixer circuit, G...local oscillation circuit, H...IF amplifier circuit.
Claims (1)
有するチユーナ装置であつて、前記可変トラツプ
回路を構成する可変容量ダイオードと接地間に直
列接続された第１・第２コンデンサを並列に接続
し、前記直列接続された第１・第２コンデンサの
接続中点にスイツチング素子を設けると共に、該
スイツチング素子にバンド切換用端子を備えたこ
とを特徴とするチユーナ装置。 A tuner device having a variable trap circuit including a variable capacitance diode, wherein first and second capacitors connected in series are connected in parallel between the variable capacitance diode constituting the variable trap circuit and the ground, and the capacitor connected in series is connected in parallel. A tuner device characterized in that a switching element is provided at the midpoint of connection between the first and second capacitors, and the switching element is provided with a band switching terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1296888U JPH0535629Y2 (en) | 1988-02-01 | 1988-02-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1296888U JPH0535629Y2 (en) | 1988-02-01 | 1988-02-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01117133U true JPH01117133U (en) | 1989-08-08 |
| JPH0535629Y2 JPH0535629Y2 (en) | 1993-09-09 |
Family
ID=31222882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1296888U Expired - Lifetime JPH0535629Y2 (en) | 1988-02-01 | 1988-02-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0535629Y2 (en) |
-
1988
- 1988-02-01 JP JP1296888U patent/JPH0535629Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0535629Y2 (en) | 1993-09-09 |