JPH0245468U - - Google Patents
Info
- Publication number
- JPH0245468U JPH0245468U JP12275288U JP12275288U JPH0245468U JP H0245468 U JPH0245468 U JP H0245468U JP 12275288 U JP12275288 U JP 12275288U JP 12275288 U JP12275288 U JP 12275288U JP H0245468 U JPH0245468 U JP H0245468U
- Authority
- JP
- Japan
- Prior art keywords
- current
- transistor
- operational amplifier
- inverting input
- input terminal
- 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.)
- Granted
Links
- 238000005259 measurement Methods 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Measurement Of Current Or Voltage (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図、第３図はそれぞれ本考案の他の実施例を示す
回路図である。
１…電圧入力端子、２…オペアンプ、３ａ，３
ｂ，８，９…トランジスタ、４…電圧出力端子、
５…オペアンプ、６，１０…抵抗、７…負荷。な
お、図中同一符号は同一または相当するものを示
す。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
3 are circuit diagrams showing other embodiments of the present invention. 1... Voltage input terminal, 2... Operational amplifier, 3a, 3
b, 8, 9...transistor, 4...voltage output terminal,
5...Operation amplifier, 6,10...Resistor, 7...Load. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
を測定する電圧印加電流測定回路において、第１
のオペアンプの非反転入力端子に上記設定電圧を
接続し、該オペアンプの出力端子からダイオード
接続した第１のトランジスタを経て一端を接地し
た上記負荷に電流を流すよう構成した電流回路、 上記第１のトランジスタと上記負荷との接続点
の電圧を上記第１のオペアンプの反転入力端子に
接続し、上記負荷に加えられる電圧がほぼ等しく
なるよう制御するフイードバツク回路、 上記第１のトランジスタに対するカレントミラ
ーを構成し、上記第１のトランジスタに流れる電
流とほぼ同一の電流が流れる第２のトランジスタ
、 第２のオペアンプの反転入力端子に上記第２の
トランジスタの電流出力端子を接続し、該第２の
オペアンプの非反転入力端子を接地し、該第２の
オペアンプの出力端子と上記反転入力端子との間
に所定抵抗値の抵抗を接続して構成した電流電圧
変換回路を備えたことを特徴とする電圧印加電流
測定回路。[Claims for Utility Model Registration] In a voltage application current measurement circuit that applies a set voltage to a load and measures the current flowing through the load,
A current circuit configured to connect the set voltage to a non-inverting input terminal of an operational amplifier, and to flow a current from the output terminal of the operational amplifier to the load whose one end is grounded through a diode-connected first transistor; A feedback circuit that connects the voltage at the connection point between the transistor and the load to the inverting input terminal of the first operational amplifier and controls the voltages applied to the load to be approximately equal; a current mirror for the first transistor; The current output terminal of the second transistor is connected to the inverting input terminal of the second transistor and the second operational amplifier, through which almost the same current as the current flowing through the first transistor flows, and the current output terminal of the second transistor is connected to the inverting input terminal of the second operational amplifier. A voltage application characterized by comprising a current-voltage conversion circuit configured by grounding a non-inverting input terminal and connecting a resistor having a predetermined resistance value between the output terminal of the second operational amplifier and the inverting input terminal. Current measurement circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12275288U JPH07947Y2 (en) | 1988-09-21 | 1988-09-21 | Voltage applied current measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12275288U JPH07947Y2 (en) | 1988-09-21 | 1988-09-21 | Voltage applied current measurement circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0245468U true JPH0245468U (en) | 1990-03-28 |
| JPH07947Y2 JPH07947Y2 (en) | 1995-01-11 |
Family
ID=31370976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12275288U Expired - Lifetime JPH07947Y2 (en) | 1988-09-21 | 1988-09-21 | Voltage applied current measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07947Y2 (en) |
-
1988
- 1988-09-21 JP JP12275288U patent/JPH07947Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07947Y2 (en) | 1995-01-11 |
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