JPS6428037U - - Google Patents
Info
- Publication number
- JPS6428037U JPS6428037U JP1987124122U JP12412287U JPS6428037U JP S6428037 U JPS6428037 U JP S6428037U JP 1987124122 U JP1987124122 U JP 1987124122U JP 12412287 U JP12412287 U JP 12412287U JP S6428037 U JPS6428037 U JP S6428037U
- Authority
- JP
- Japan
- Prior art keywords
- external
- signal
- internal
- input terminal
- external signal
- 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
- 230000005669 field effect Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Noise Elimination (AREA)
- Electronic Switches (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来例を示す回路図である。
１１は外部入力端子、１１ａはシールド端子、
１２は入力増幅器、１３は内外信号切換え回路、
１４は切換えスイツチ、Ｑ１１，Ｑ１３，Ｑ１４
は電界効果トランジスタ、Ｑ１２はトランジスタ
、Ｒ１１，Ｒ１２，Ｒ１３，Ｒ１４，Ｒ１５，Ｒ
１６，Ｒ１７，Ｒ１８は抵抗、Ｃ１１，Ｃ１２は
コンデンサ、Ｌ１はコイルである。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a circuit diagram showing a conventional example. 11 is an external input terminal, 11a is a shield terminal,
12 is an input amplifier, 13 is an internal/external signal switching circuit,
14 is a changeover switch, Q 11 , Q 13 , Q 14
is a field effect transistor, Q 12 is a transistor, R 11 , R 12 , R 13 , R 14 , R 15 , R
16 , R 17 and R 18 are resistors, C 11 and C 12 are capacitors, and L 1 is a coil.
Claims (1)
から供給された外部信号を入力するための外部入
力端子と、この外部入力端子に加わる外部信号、
および信号処理装置から入力された内部信号とを
切り換えて送出する内外信号切換え回路とを有し
、上記外部入力端子に入力された外部信号が、外
部導体と内部導体とを備えたシールド線によつて
内外信号切換え回路に供給されると共に、上記の
内外信号切換え回路が、出力側への外部信号の導
通を制御するスイツチング素子と、出力側への内
部信号の導通を制御するスイツチング素子とを備
えた外部信号入力装置において、 上記内外信号切換え回路における外部信号制御
側のスイツチング素子として電界効果トランジス
タが設けられ、かつこの電界効果トランジスタが
、外部入力端子から出力側に至る信号導通経路に
直列に介装されると共に、上記シールド線の外部
導体がコイルを介して接地されたことを特徴とす
る外部信号入力装置。[Claims for Utility Model Registration] An external input terminal provided in a signal processing device for inputting an external signal supplied from outside the signal processing device, an external signal applied to this external input terminal,
and an internal/external signal switching circuit that switches and transmits an internal signal input from the signal processing device, and the external signal input to the external input terminal is transmitted through a shielded wire having an external conductor and an internal conductor. The internal/external signal switching circuit includes a switching element that controls conduction of an external signal to the output side, and a switching element that controls conduction of an internal signal to the output side. In the external signal input device, a field effect transistor is provided as a switching element on the external signal control side in the external/internal signal switching circuit, and the field effect transistor is interposed in series in a signal conduction path from the external input terminal to the output side. An external signal input device characterized in that the external conductor of the shielded wire is grounded via a coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987124122U JPS6428037U (en) | 1987-08-12 | 1987-08-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987124122U JPS6428037U (en) | 1987-08-12 | 1987-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6428037U true JPS6428037U (en) | 1989-02-17 |
Family
ID=31373582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987124122U Pending JPS6428037U (en) | 1987-08-12 | 1987-08-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6428037U (en) |
-
1987
- 1987-08-12 JP JP1987124122U patent/JPS6428037U/ja active Pending
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