JPH0361729U - - Google Patents
Info
- Publication number
- JPH0361729U JPH0361729U JP1989122936U JP12293689U JPH0361729U JP H0361729 U JPH0361729 U JP H0361729U JP 1989122936 U JP1989122936 U JP 1989122936U JP 12293689 U JP12293689 U JP 12293689U JP H0361729 U JPH0361729 U JP H0361729U
- Authority
- JP
- Japan
- Prior art keywords
- primary side
- tuning coil
- tuning
- band tuning
- coil
- 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 description 5
- 238000013016 damping Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 230000005669 field effect Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は本考案の一実施例に係るチユーナ回路
の回路図、第２図は従来例のチユーナ回路に係る
回路図である。
Ｑ１……高周波増幅用電界効果トランジスタ、
Ｄ……ドレイン（正極端子）、Ｓ……ソース（負
極端子）、Ｃ１，Ｃ２……１次側同調コンデンサ
、Ｄ３……１次側バラクタダイオード、Ｌ１……
１次側ハイバンド同調コイル、Ｌ３……１次側ロ
ーバンド同調コイル、Ｄ１……１次側スイツチン
グダイオード、Ｒ７……バイアス兼１次側ダンピ
ング抵抗、Ｃ３，Ｃ４……２次側同調コンデンサ
、Ｄ４……２次側バラクタダイオード、Ｌ２……
２次側ハイバンド同調コイル、Ｌ４……２次側ロ
ーバンド同調コイル、Ｄ２……２次側スイツチン
グダイオード、Ｒ３……接地バイアス抵抗、Ｒ６
……２次側ダンピング抵抗、ＢＨ……ハイバンド
選択端子、ＢＬ……ローバンド選択端子、ＶＴ…
…チユーニング電圧端子。
FIG. 1 is a circuit diagram of a tuner circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional tuner circuit. Q1 ...field effect transistor for high frequency amplification,
D...Drain (positive terminal), S...Source (negative terminal), C1 , C2 ...Primary side tuning capacitor, D3 ...Primary side varactor diode, L1 ...
Primary side high band tuning coil, L3 ... Primary side low band tuning coil, D1 ...Primary side switching diode, R7 ...Bias and primary side damping resistance, C3 , C4 ...2 Secondary side tuning capacitor, D 4 ...Secondary side varactor diode, L 2 ...
Secondary side high band tuning coil, L 4 ... Secondary side low band tuning coil, D 2 ... Secondary side switching diode, R 3 ... Ground bias resistance, R 6
...Secondary side damping resistance, BH...High band selection terminal, BL...Low band selection terminal, VT...
...Tuning voltage terminal.
Claims (1)
極端子に接続された１次側同調コンデンサと、 この１次側同調コンデンサとともに並列共振回
路を構成する１次側ハイバンド同調コイルおよび
１次側ローバンド同調コイルとの直列回路と、 前記１次側の各同調コイルに相互誘導によつて
結合された２次側ハイバンド同調コイルおよび２
次側ローバンド同調コイルとの直列回路と、 この２次側の両同調コイルとともに並列共振回
路を構成する２次側同調コンデンサと、 前記１次側および２次側の両ローバンド同調コ
イルの負極端子に接続されたローバンド選択端子
と、 前記２次側ローバンド同調コイルに並列接続さ
れた２次側ダンピング抵抗と、 前記１次側のハイバンド同調コイルとローバン
ド同調コイルとの接続点にカソードが接続され、
アノードがハイバンド選択端子に接続された１次
側スイツチングダイオードと、 前記２次側のハイバンド同調コイルとローバン
ド同調コイルとの接続点にカソードが接続され、
アノードが前記ハイバンド選択端子に接続された
２次側スイツチングダイオードと、 前記高周波増幅用電界効果トランジスタの負極
端子とアースとの間に接続された接地バイアス抵
抗と、 この負極端子と接地バイアス抵抗との接続点と
前記１次側スイツチングダイオードのカソードと
の間に接続されたバイアス兼１次側ダンピング抵
抗 とを備えたことを特徴とするチユーナ回路。[Claims for Utility Model Registration] A field effect transistor for high frequency amplification, a primary side tuning capacitor connected to its positive terminal, and a primary side high band tuning coil that constitutes a parallel resonant circuit together with this primary side tuning capacitor. and a series circuit with a primary side low band tuning coil, and a secondary side high band tuning coil coupled to each of the primary side tuning coils by mutual induction;
A series circuit with the secondary low-band tuning coil, a secondary tuning capacitor that forms a parallel resonant circuit together with both secondary tuning coils, and a negative terminal of both the primary and secondary low-band tuning coils. A cathode is connected to the connected low band selection terminal, a secondary damping resistor connected in parallel to the secondary low band tuning coil, and a connection point between the high band tuning coil and the low band tuning coil on the primary side,
a primary side switching diode whose anode is connected to a high band selection terminal, and a cathode connected to a connection point between the high band tuning coil and the low band tuning coil on the secondary side,
a secondary side switching diode whose anode is connected to the high band selection terminal; a ground bias resistor connected between the negative terminal of the high frequency amplification field effect transistor and the ground; and a ground bias resistor between the negative terminal and the ground bias resistor. A tuner circuit comprising: a bias/primary side damping resistor connected between a connection point with the primary side switching diode and a cathode of the primary side switching diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989122936U JPH0718190Y2 (en) | 1989-10-19 | 1989-10-19 | Tuner circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989122936U JPH0718190Y2 (en) | 1989-10-19 | 1989-10-19 | Tuner circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0361729U true JPH0361729U (en) | 1991-06-17 |
| JPH0718190Y2 JPH0718190Y2 (en) | 1995-04-26 |
Family
ID=31670935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989122936U Expired - Lifetime JPH0718190Y2 (en) | 1989-10-19 | 1989-10-19 | Tuner circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0718190Y2 (en) |
-
1989
- 1989-10-19 JP JP1989122936U patent/JPH0718190Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0718190Y2 (en) | 1995-04-26 |
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