JPS61151418U - - Google Patents
Info
- Publication number
- JPS61151418U JPS61151418U JP3335785U JP3335785U JPS61151418U JP S61151418 U JPS61151418 U JP S61151418U JP 3335785 U JP3335785 U JP 3335785U JP 3335785 U JP3335785 U JP 3335785U JP S61151418 U JPS61151418 U JP S61151418U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- emitter
- uhf
- reception
- vhf
- 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 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 7
Description
第１図は本考案に係る中間周波増幅回路の一実
施例を示す回路図、第２図は本考案により実現さ
れるチユーナの電力利得の配分を示す図、第３図
は本考案の他の実施例を示す回路図、第４図は本
考案を適用したチユーナの一例を示す回路ブロツ
ク図、第５図は同上チユーナにおける電力利得の
系統図、第６図は従来の中間周波増幅回路の一例
を示す回路図、第７図は従来のチユーナによる電
力利得の配分を示す図である。
１５……増幅用トランジスタ、１６……負荷抵
抗、１７……電源端子、１８，１９……ベースバ
イアス抵抗、２０……帰還抵抗、２３……利得切
替電圧入力端子、２４……ダイオード、２５……
抵抗。
Fig. 1 is a circuit diagram showing one embodiment of an intermediate frequency amplification circuit according to the present invention, Fig. 2 is a diagram showing distribution of power gain of a tuner realized by the present invention, and Fig. 3 is a circuit diagram showing an embodiment of an intermediate frequency amplification circuit according to the present invention. A circuit diagram showing an embodiment, FIG. 4 is a circuit block diagram showing an example of a tuner to which the present invention is applied, FIG. 5 is a power gain system diagram in the same tuner, and FIG. 6 is an example of a conventional intermediate frequency amplification circuit. FIG. 7 is a diagram showing distribution of power gain by a conventional tuner. 15... Amplification transistor, 16... Load resistor, 17... Power supply terminal, 18, 19... Base bias resistor, 20... Feedback resistor, 23... Gain switching voltage input terminal, 24... Diode, 25... …
resistance.
Claims (1)
に供給され、エミツタと基準電位点間に抵抗を有
し、かつコレクタは負荷抵抗を介して電圧源に接
続され、そのコレクタより出力を取出すようにし
た増幅用トランジスタと、 ＶＨＦ受信時とＵＨＦ受信時とでそれぞれ異な
るレベルの電圧を前記トランジスタのエミツタに
印加し、その増幅率を切替える手段とを備えて成
る中間周波増幅回路。[Claims for Utility Model Registration] A VHF or UHF intermediate frequency signal is supplied to the base, a resistor is provided between the emitter and the reference potential point, and the collector is connected to a voltage source via a load resistor. An intermediate frequency amplification circuit comprising an amplification transistor configured to take out an output, and means for applying voltages of different levels to the emitter of the transistor during VHF reception and UHF reception to switch the amplification factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3335785U JPS61151418U (en) | 1985-03-11 | 1985-03-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3335785U JPS61151418U (en) | 1985-03-11 | 1985-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61151418U true JPS61151418U (en) | 1986-09-19 |
Family
ID=30535733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3335785U Pending JPS61151418U (en) | 1985-03-11 | 1985-03-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61151418U (en) |
-
1985
- 1985-03-11 JP JP3335785U patent/JPS61151418U/ja active Pending