JPH0244425U - - Google Patents
Info
- Publication number
- JPH0244425U JPH0244425U JP12404888U JP12404888U JPH0244425U JP H0244425 U JPH0244425 U JP H0244425U JP 12404888 U JP12404888 U JP 12404888U JP 12404888 U JP12404888 U JP 12404888U JP H0244425 U JPH0244425 U JP H0244425U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- emitter
- pass filter
- constant current
- capacitor
- 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
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Networks Using Active Elements (AREA)
Description
第１図および第２図は夫々本考案の実施例を示
す回路図である。
１……可変インピーダンス素子として動作する
ＮＰＮトランジスタ、２……１のＮＰＮトランジ
スタのエミツタインピーダンスを変化させる可変
定電流源、３……ハイパスフイルタの特性を決め
る結合コンゼンサ、４……１のＮＰＮトランジス
タのベースバイアス源、５……電源、６……入力
信号、７……出力端子、８……定電流回路の電流
を制御する可変電圧源、９……定電流回路を成す
ＰＮＰトランジスタ、１０……トランジスタ９と
ともに定電流回路を構成する抵抗、１１……可変
インピーダンス素子として動作するＰＮＰトラン
ジスタ。
1 and 2 are circuit diagrams showing embodiments of the present invention, respectively. 1... NPN transistor that operates as a variable impedance element, 2... Variable constant current source that changes the emitter impedance of the NPN transistor 1, 3... Coupling capacitor that determines the characteristics of the high-pass filter, 4... NPN transistor 1 base bias source, 5...power supply, 6...input signal, 7...output terminal, 8...variable voltage source for controlling the current of the constant current circuit, 9...PNP transistor forming the constant current circuit, 10... . . . A resistor that constitutes a constant current circuit together with the transistor 9, 11 . . . A PNP transistor that operates as a variable impedance element.
Claims (1)
ミツタに可変電流源が接続されたトランジスタを
備え、このトランジスタのエミツタにコンデンサ
を介して信号を入力することを特徴とするハイパ
スフイルタ。 A high-pass filter comprising a transistor whose base is applied with a predetermined DC bias voltage and whose emitter is connected to a variable current source, and a signal is input to the emitter of the transistor via a capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12404888U JPH0244425U (en) | 1988-09-21 | 1988-09-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12404888U JPH0244425U (en) | 1988-09-21 | 1988-09-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0244425U true JPH0244425U (en) | 1990-03-27 |
Family
ID=31373446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12404888U Pending JPH0244425U (en) | 1988-09-21 | 1988-09-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0244425U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995004401A1 (en) * | 1993-07-27 | 1995-02-09 | Fujitsu Limited | Filter circuit |
-
1988
- 1988-09-21 JP JP12404888U patent/JPH0244425U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995004401A1 (en) * | 1993-07-27 | 1995-02-09 | Fujitsu Limited | Filter circuit |