JPH0232117U - - Google Patents
Info
- Publication number
- JPH0232117U JPH0232117U JP10998088U JP10998088U JPH0232117U JP H0232117 U JPH0232117 U JP H0232117U JP 10998088 U JP10998088 U JP 10998088U JP 10998088 U JP10998088 U JP 10998088U JP H0232117 U JPH0232117 U JP H0232117U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- emitter
- resistor
- input terminal
- resistance value
- 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
- 239000004065 semiconductor Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
第１図はこの考案の一実施例を示す接続図、第
２図は定電流源回路の基本構成を示す接続図、第
３図、第４図は従来の回路を示す接続図。
１……信号電圧入力端子、２……出力端子、３
……演算増幅器、４……負帰還抵抗、５……バイ
パスコンデンサ、１０，１１……電源端子、Ｑ１
，Ｑ２……カレントミラーを構成するｎｐｎトラ
ンジスタ。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 connection diagram showing an embodiment of this invention, FIG. 2 is a connection diagram showing the basic configuration of a constant current source circuit, and FIGS. 3 and 4 are connection diagrams showing conventional circuits. 1...Signal voltage input terminal, 2...Output terminal, 3
...Operation amplifier, 4...Negative feedback resistor, 5...Bypass capacitor, 10, 11...Power terminal, Q1
, Q2... npn transistor forming a current mirror. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
２のベースを互いに接続し、Ｑ１のエミツタを抵
抗値Ｒ１の抵抗を経て第１の直流電圧に接続し、
Ｑ２のエミツタを抵抗値Ｒ２の抵抗を経て上記第
１の直流電圧に接続してカレントミラー回路を構
成し、Ｑ１に流れる電流によつて定められる定電
流をＱ２のコレクタ回路に流すようにした定電流
半導体回路において、 その出力端子がＱ１のベースに接続され、その
反転入力端子がＱ１のコレクタに接続される演算
増幅器、 この演算増幅器の上記反転入力端子と上記第１
の直流電圧よりも高い第２の直流電圧との間に接
続される負帰還抵抗、 上記演算増幅器の非反転入力端子に所望の直流
電圧を接続する手段、 Ｑ１のエミツタと上記第１の直流電圧との間に
上記抵抗値Ｒ１の抵抗に並列に接続されるバイパ
スコンデンサ、 を備えたことを特徴とする定電流半導体回路。[Claims for Utility Model Registration] Two npn transistors Q1 and Q with the same characteristics
The bases of Q2 are connected to each other, the emitter of Q1 is connected to the first DC voltage through a resistor with a resistance value R1,
A current mirror circuit is constructed by connecting the emitter of Q2 to the first DC voltage through a resistor with a resistance value R2, and a constant current determined by the current flowing through Q1 is caused to flow through the collector circuit of Q2. In a current semiconductor circuit, an operational amplifier whose output terminal is connected to the base of Q1 and whose inverting input terminal is connected to the collector of Q1, the inverting input terminal of this operational amplifier and the first
a negative feedback resistor connected between the emitter of Q1 and a second DC voltage higher than the DC voltage of Q1, means for connecting a desired DC voltage to the non-inverting input terminal of the operational amplifier, and the emitter of Q1 and the first DC voltage. A constant current semiconductor circuit comprising: a bypass capacitor connected in parallel to the resistor having a resistance value R1 between the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10998088U JPH0232117U (en) | 1988-08-24 | 1988-08-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10998088U JPH0232117U (en) | 1988-08-24 | 1988-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0232117U true JPH0232117U (en) | 1990-02-28 |
Family
ID=31346721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10998088U Pending JPH0232117U (en) | 1988-08-24 | 1988-08-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0232117U (en) |
-
1988
- 1988-08-24 JP JP10998088U patent/JPH0232117U/ja active Pending
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