JPH0177045U - - Google Patents
Info
- Publication number
- JPH0177045U JPH0177045U JP1987172134U JP17213487U JPH0177045U JP H0177045 U JPH0177045 U JP H0177045U JP 1987172134 U JP1987172134 U JP 1987172134U JP 17213487 U JP17213487 U JP 17213487U JP H0177045 U JPH0177045 U JP H0177045U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- grounding
- midpoint
- output end
- input end
- 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
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (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図及び第３図はその等価回路を示す
図、第４図は従来のチユーナ装置の要部回路図で
ある。
１……段間結合回路、Ｑ……混合用トランジス
タ、Ｌ１，Ｌ２……第１、第２マツチングコイル
、Ｃ１，Ｃ２……第１、第２結合コンデンサ、Ｄ
１……スイツチングダイオード。
FIG. 1 is a circuit diagram of a main part of a tuner device embodying the present invention, FIGS. 2 and 3 are diagrams showing equivalent circuits thereof, and FIG. 4 is a circuit diagram of a main part of a conventional tuner device. 1...Inter-stage coupling circuit, Q...Mixing transistor, L1 , L2 ...First and second matching coils, C1 , C2 ...First and second coupling capacitors, D
1 ...Switching diode.
Claims (1)
チングコイルを直列に接続し、段間結合回路の出
力端と前記混合回路の入力端との間に第１の結合
コンデンサを接続し、前記段間結合回路の出力端
と前記第１、第２マツチングコイルの接続中点と
の間に第２の結合コンデンサを接続し、前記接続
中点に該中点をバンド切換え信号によつて接地ま
たは非接地となすスイツチング手段を接続したチ
ユーナ装置。 first and second matching coils are connected in series between the input end of the mixing circuit and ground, and a first coupling capacitor is connected between the output end of the interstage coupling circuit and the input end of the mixing circuit, A second coupling capacitor is connected between the output end of the interstage coupling circuit and the connection midpoint of the first and second matching coils, and the midpoint is connected to the connection midpoint by a band switching signal. A tuner device connected to a switching means for grounding or non-grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987172134U JPH0177045U (en) | 1987-11-11 | 1987-11-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987172134U JPH0177045U (en) | 1987-11-11 | 1987-11-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0177045U true JPH0177045U (en) | 1989-05-24 |
Family
ID=31464119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987172134U Pending JPH0177045U (en) | 1987-11-11 | 1987-11-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0177045U (en) |
-
1987
- 1987-11-11 JP JP1987172134U patent/JPH0177045U/ja active Pending
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