JPH01139624U - - Google Patents
Info
- Publication number
- JPH01139624U JPH01139624U JP3646788U JP3646788U JPH01139624U JP H01139624 U JPH01139624 U JP H01139624U JP 3646788 U JP3646788 U JP 3646788U JP 3646788 U JP3646788 U JP 3646788U JP H01139624 U JPH01139624 U JP H01139624U
- Authority
- JP
- Japan
- Prior art keywords
- current source
- input terminal
- resistor
- current
- inverting input
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Networks Using Active Elements (AREA)
Description
第１図はこの考案の一実施例である電圧制御型
高域通過フイルタの回路図、第２図は従来の高域
通過フイルタの回路図である。
図において、ＣＦはフイルタコンデンサ、ＲＥ
，ＲＦ，ＲＬは抵抗、ＶＣはバイアス電圧、Ｖ０
は電圧を示す。なお、図中、同一符号は同一また
は相当部分を示す。
FIG. 1 is a circuit diagram of a voltage-controlled high-pass filter that is an embodiment of this invention, and FIG. 2 is a circuit diagram of a conventional high-pass filter. In the figure, CF is a filter capacitor, RE
, RF, RL are resistances, VC is bias voltage, V 0
indicates voltage. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
器、この差動増幅器の非反転入力端子には電圧源
が接続され、非反転出力には電流振分け用の第１
の差動対が接続される一方、第２の電流源の電流
振分け用の第２の差動対があり、第１と第２の差
動対には同一の電流振分け用制御電圧が印加され
、この制御電圧に対し互いに逆の電流増減特性を
もつコレクタ同士が接続され、その接続点には第
１の抵抗とトランジスタのベース電極が接続され
、該トランジスタのエミツタにはバイアス電流源
と第２の抵抗が接続され、該第２の抵抗の他端は
前記差動増幅器の反転入力端子に接続されると共
に、フイルタの出力端子となり、前記反転入力端
子はコンデンサを介してフイルタ入力端子に接続
されていることを特徴とする電圧制御型高域通過
フイルタ回路。 A differential amplifier that uses a first current source as a bias current source. A voltage source is connected to the non-inverting input terminal of this differential amplifier, and the first current source for current distribution is connected to the non-inverting output.
While the differential pair of the second current source is connected, there is a second differential pair for current distribution of the second current source, and the same current distribution control voltage is applied to the first and second differential pairs. , collectors having opposite current increase/decrease characteristics with respect to this control voltage are connected to each other, a first resistor and a base electrode of a transistor are connected to the connection point, and a bias current source and a second resistor are connected to the emitter of the transistor. The other end of the second resistor is connected to the inverting input terminal of the differential amplifier and serves as the output terminal of the filter, and the inverting input terminal is connected to the filter input terminal via a capacitor. A voltage-controlled high-pass filter circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3646788U JPH01139624U (en) | 1988-03-18 | 1988-03-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3646788U JPH01139624U (en) | 1988-03-18 | 1988-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01139624U true JPH01139624U (en) | 1989-09-25 |
Family
ID=31263069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3646788U Pending JPH01139624U (en) | 1988-03-18 | 1988-03-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01139624U (en) |
-
1988
- 1988-03-18 JP JP3646788U patent/JPH01139624U/ja active Pending