JPH028239U - - Google Patents
Info
- Publication number
- JPH028239U JPH028239U JP1988087600U JP8760088U JPH028239U JP H028239 U JPH028239 U JP H028239U JP 1988087600 U JP1988087600 U JP 1988087600U JP 8760088 U JP8760088 U JP 8760088U JP H028239 U JPH028239 U JP H028239U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output terminal
- switching diode
- terminal
- antenna
- 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
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Television Signal Processing For Recording (AREA)
- Filters And Equalizers (AREA)
- 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を示すアンテナミキ
サの回路図、第２図および第３図は同アンテナミ
キサ回路のトランジスタ３４の交流負荷線図を示
し、第２図はトランジスタ３４の動作点が飽和領
域に位置し、第３図はトランジスタ３４の動作点
が交流負荷線の中央部に位置している図、第４図
および第５図は本考案の一実施例および従来例の
アンテナミキサのトラツプ特性図、第６図は従来
のアンテナミキサの回路図である。
２１……外部入力端子（アンテナ入力端子）、
２３，３４……トランジスタ、２９……Ｂ端子、
３０，３５，３６，３７，３９，４３……抵抗、
３２……ＶＴＲ用出力端子、３８……Ｂｓ端子、
４０，４２……スイツチングダイオード、４５…
…コンデンサ、４６……コイル、４９……ＲＦ出
力端子（ＴＶ用出力端子）。
FIG. 1 is a circuit diagram of an antenna mixer showing an embodiment of the present invention, FIGS. 2 and 3 are AC load diagrams of a transistor 34 of the antenna mixer circuit, and FIG. 2 is an operating point of the transistor 34. is located in the saturation region, and FIG. 3 is a diagram in which the operating point of the transistor 34 is located in the center of the AC load line, and FIGS. FIG. 6 is a circuit diagram of a conventional antenna mixer. 21...External input terminal (antenna input terminal),
23, 34...transistor, 29...B terminal,
30, 35, 36, 37, 39, 43...resistance,
32...VTR output terminal, 38...Bs terminal,
40, 42...Switching diode, 45...
... Capacitor, 46 ... Coil, 49 ... RF output terminal (TV output terminal).
Claims (1)
をＴＶ用ＲＦ出力端子とＶＴＲ用出力端子に導く
回路を有し、前記アンテナ入力端子より前記ＲＦ
出力端子までに信号を増幅する回路と、前記増幅
回路から前記ＲＦ出力端子への出力信号をオン、
オフするスイツチングダイオードを設け、前記ス
イツチングダイオードの出力側にコイルとコンデ
ンサで構成される直列共振回路を、その共振周波
数を妨害周波数に設定して設け、ＴＶモードまた
はＶＴＲモードに応じて前記スイツチングダイオ
ードをオン、オフ制御するとともに前記増幅回路
の利得を制御する手段を設けたアンテナミキサ。 It has a circuit that leads an external input signal input from the antenna input terminal to a TV RF output terminal and a VTR output terminal, and the circuit leads the external input signal input from the antenna input terminal to the RF
a circuit that amplifies the signal up to the output terminal; and an output signal from the amplification circuit to the RF output terminal is turned on;
A switching diode that turns off is provided, and a series resonant circuit consisting of a coil and a capacitor is provided on the output side of the switching diode, with its resonant frequency set to the interference frequency, and the switch is turned off depending on the TV mode or VTR mode. An antenna mixer comprising means for controlling on/off of a switching diode and controlling the gain of the amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988087600U JPH028239U (en) | 1988-06-30 | 1988-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988087600U JPH028239U (en) | 1988-06-30 | 1988-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH028239U true JPH028239U (en) | 1990-01-19 |
Family
ID=31312205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988087600U Pending JPH028239U (en) | 1988-06-30 | 1988-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH028239U (en) |
-
1988
- 1988-06-30 JP JP1988087600U patent/JPH028239U/ja active Pending