JPH0377997U - - Google Patents
Info
- Publication number
- JPH0377997U JPH0377997U JP13949089U JP13949089U JPH0377997U JP H0377997 U JPH0377997 U JP H0377997U JP 13949089 U JP13949089 U JP 13949089U JP 13949089 U JP13949089 U JP 13949089U JP H0377997 U JPH0377997 U JP H0377997U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- bias
- impedance matching
- matching section
- input 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
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案による入力信号レベル切り替え
装置の一実施例を示す回路図、第２図は従来の入
力信号レベル切り替え装置を示す回路図である。
１……インピーダンス整合用抵抗、２，８……
カツプリングコンデンサ、３……ＤＣバイアス回
路、４……レベル分割用抵抗、５……レベル分割
用抵抗、６……切り替え用ダイオード、７……切
り替え用トランジスタ、９−ａ……切り替え端子
、９−ｂ……切り替え端子、９−ｎ……切り替え
端子、１０……入力端子、１１−ａ……切り替え
回路、１１−ｂ……切り替え回路、１１−ｎ……
切り替え回路、１２……プリアンプ部。
FIG. 1 is a circuit diagram showing an embodiment of an input signal level switching device according to the present invention, and FIG. 2 is a circuit diagram showing a conventional input signal level switching device. 1... Impedance matching resistor, 2, 8...
Coupling capacitor, 3... DC bias circuit, 4... Level division resistor, 5... Level division resistor, 6... Switching diode, 7... Switching transistor, 9-a... Switching terminal, 9 -b...Switching terminal, 9-n...Switching terminal, 10...Input terminal, 11-a...Switching circuit, 11-b...Switching circuit, 11-n...
Switching circuit, 12... preamplifier section.
Claims (1)
インピーダンス整合部と、 このインピーダンス整合部の出力にＤＣバイア
スをかけるＤＣバイアス回路と、 前記インピーダンス整合部の出力か又は、前記
ＤＣバイアス回路の出力かのいずれか一方を選択
的引き出す切り替え回路とを具備したことを特徴
とする入力信号レベル切り替え装置。[Claims for Utility Model Registration] An impedance matching section that impedance matches an input signal, a DC bias circuit that applies a DC bias to the output of the impedance matching section, and an output of the impedance matching section or the DC bias. An input signal level switching device comprising: a switching circuit for selectively drawing out one of the outputs of the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13949089U JPH0377997U (en) | 1989-11-30 | 1989-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13949089U JPH0377997U (en) | 1989-11-30 | 1989-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0377997U true JPH0377997U (en) | 1991-08-06 |
Family
ID=31686531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13949089U Pending JPH0377997U (en) | 1989-11-30 | 1989-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0377997U (en) |
-
1989
- 1989-11-30 JP JP13949089U patent/JPH0377997U/ja active Pending