JPH0266613A - Constant current circuit - Google Patents
Constant current circuitInfo
- Publication number
- JPH0266613A JPH0266613A JP63217378A JP21737888A JPH0266613A JP H0266613 A JPH0266613 A JP H0266613A JP 63217378 A JP63217378 A JP 63217378A JP 21737888 A JP21737888 A JP 21737888A JP H0266613 A JPH0266613 A JP H0266613A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- temperature coefficient
- constant current
- current circuit
- voltage
- 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
- 238000000034 method Methods 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
Landscapes
- Amplifiers (AREA)
- Thermistors And Varistors (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】 主粟上皇且里立国 本考案は定電流回路に関するものである。[Detailed description of the invention] Retired Emperor Shuso and established a country The present invention relates to a constant current circuit.
従来少及歪
定電流回路は集積回路において使用されることが多いが
、このような定電流回路の従来例を第３図に示す。同図
において、定電流（！、）はトランジスタ（Ｑｌ）及び
抵抗（Ｒ１）を通して接地点へ流れるが、その際に抵抗
（Ｒ１）によって（ａ）点に生じる電圧は演算増幅器（
１）の（−）入力端子に与えられる。この演算増幅器（
１）の（＋）入力端子は温度係数が零の電圧基準源（２
）に接続され、出力端子はトランジスタ（Ｑｌ）のベー
スに接続されている。この場合、演算増幅器（１）の（
＝）入力端子へ入力される電圧が（＋）入力端子へ入力
される電圧と等しくなるようにトランジスタ（Ｑｌ）が
制御されることになる。Conventional low-distortion constant current circuits are often used in integrated circuits, and a conventional example of such a constant current circuit is shown in FIG. In the same figure, a constant current (!,) flows to the ground point through the transistor (Ql) and the resistor (R1), but at this time, the voltage generated at point (a) by the resistor (R1) is transferred to the operational amplifier (
1) is applied to the (-) input terminal. This operational amplifier (
The (+) input terminal of 1) is a voltage reference source (2) with a temperature coefficient of zero.
), and its output terminal is connected to the base of the transistor (Ql). In this case, the operational amplifier (1) (
The transistor (Ql) is controlled so that the voltage input to the =) input terminal becomes equal to the voltage input to the (+) input terminal.
従って、電圧基準源（２）の電圧を（Ｖ、）とすると、
定電流（１１）は、ｒ ＋ ＝ ｖ Ｉ／ Ｒ＋となる
。Therefore, if the voltage of the voltage reference source (2) is (V, ), then
The constant current (11) is r + = v I/R+.
８ ＜ ° ゛と るｉ
ところで上記従来回路では抵抗（Ｒ＋）を同一集積回路
内に作成した場合、半導体のウェハープロセス固有の抵
抗体の温度係数により定電流出力の温度係数が決定され
てしまい、定電流出力の温度係数を制御することは出来
ない。そのため、温度変化に基づく定電流の変動を余儀
なくされていた。By the way, in the above conventional circuit, when the resistor (R+) is created in the same integrated circuit, the temperature coefficient of the constant current output is determined by the temperature coefficient of the resistor specific to the semiconductor wafer process. It is not possible to control the temperature coefficient of constant current output. Therefore, the constant current has been forced to fluctuate based on temperature changes.
本発明はこのような点に鑑みなされたものであって、簡
単な構成により温度の影響を受けない定電流回路を提供
することを目的とする。The present invention has been made in view of these points, and it is an object of the present invention to provide a constant current circuit that has a simple configuration and is not affected by temperature.
量 を”るための
上記の目的を達成するため本発明では、電流が流れるこ
とにより抵抗体に生じる電圧を前記電流を定電流とする
ための制御用電圧として使用する定電流回路において、
前記抵抗体として正の温度係数の抵抗体と負の温度係数
の抵抗体をそれらの温度係数がキャンセルされるように
接続構成している。In order to achieve the above-mentioned object of reducing the amount of current, the present invention provides a constant current circuit that uses a voltage generated in a resistor when a current flows as a control voltage for making the current a constant current.
As the resistor, a resistor having a positive temperature coefficient and a resistor having a negative temperature coefficient are connected so that their temperature coefficients cancel each other.
詐二」且
このような構成によると、例えば温度が上昇した場合、
正の温度係数の抵抗体の抵抗値は大きくなるが、負の温
度係数の抵抗体の抵抗値は小さくなるので、その合成抵
抗値は変化しないことになる。温度が低くなったときも
、正の温度係数の抵抗体の抵抗値低下が負の温度係数の
抵抗体の抵抗値増大により補償されて合成の抵抗値とし
ては変わらない。According to such a configuration, for example, when the temperature rises,
The resistance value of the resistor with a positive temperature coefficient increases, but the resistance value of the resistor with a negative temperature coefficient decreases, so the combined resistance value does not change. Even when the temperature decreases, the decrease in resistance of the resistor with a positive temperature coefficient is compensated for by the increase in the resistance of the resistor with a negative temperature coefficient, so that the combined resistance value remains unchanged.
裏」Ｌ斑
本考案を実施した第１図において、第３図と同一部分に
は同一の符号を付して重複説明を省略する。本実施例で
は、定電流（Ｉ１）が流れる抵抗体として負の温度係数
の第１抵抗体（Ｒ８）と正の温度係数の抵抗体（Ｒ３）
を直列に接続して構成したものを使用している。ここで
、第１抵抗体（Ｒ２）をポリシリコンで形成した場合、
半導体ウェハープロセスによっても多少異なるが、温度
係数は一９００ｐｐｍである。一方、第２抵抗体（Ｒ３
）を拡散抵抗で形成した場合温度係数は約＋７００ｐｐ
ｍとなる。In FIG. 1 showing the implementation of the present invention, the same parts as in FIG. 3 are given the same reference numerals and redundant explanation will be omitted. In this embodiment, a first resistor (R8) with a negative temperature coefficient and a resistor (R3) with a positive temperature coefficient are used as resistors through which a constant current (I1) flows.
I am using a configuration made by connecting them in series. Here, if the first resistor (R2) is formed of polysilicon,
Although it varies somewhat depending on the semiconductor wafer process, the temperature coefficient is -900 ppm. On the other hand, the second resistor (R3
) is formed with a diffused resistor, the temperature coefficient is approximately +700pp.
m.
今、室温での第１．第２抵抗体（Ｒｇ） （Ｒ：ｌ）の
抵抗値をそれぞれ（ｒ、） （ｒｓ）とし、基準電圧を
（Ｖ＋）とすると、出力電流（定電流）（Ｉ＋）は、Ｊ
１＝Ｖ１／ （ｒ２＋ｒｉ）
となる。また、第１．第２抵抗体（Ｒ１）（Ｒ３）の合
成温度係数は、
となる０例えば温度係数が零の定電流出力を得るために
は、
Ｉ３ ９
ｒ、 ７
の比になるように第１．第２抵抗体（Ｒｚ） （Ｒ３）
の値を決定すればよい。Now, the first one at room temperature. If the resistance values of the second resistor (Rg) (R:l) are respectively (r, ) (rs) and the reference voltage is (V+), the output current (constant current) (I+) is J
1=V1/(r2+ri). Also, 1st. The combined temperature coefficient of the second resistor (R1) (R3) is 0. For example, in order to obtain a constant current output with a temperature coefficient of zero, the first... Second resistor (Rz) (R3)
All you have to do is decide the value of .
第２図は本発明の他の実施例であり、第１図と同一部分
には同一の符号を付しである。この実施例では定電流（
■、）によってカレントミラー回路（３）を駆動し、半
導体集積回路（４）に端子ピン（５）を介して外付けさ
れた容量（Ｃ）を定電流（■、）と同値の電流（Ｉ２）
により充電する構成を示している。この場合、第１．第
２抵抗体（Ｒｚ） （Ｒ３）の温度係数のキャンセル不
足分を残し、その不足分で外付けの容量（Ｃ）の温度係
数をキャンセルするように第１．第２抵抗体（Ｒｚ）
（Ｒｓ）を設定すれば充電時間は温度に依らずに一定値
となる。FIG. 2 shows another embodiment of the present invention, in which the same parts as in FIG. 1 are given the same reference numerals. In this example, constant current (
The current mirror circuit (3) is driven by )
The figure shows a configuration in which the battery is charged by In this case, the first. The temperature coefficient of the second resistor (Rz) (R3) is left uncancelled, and the temperature coefficient of the external capacitor (C) is canceled by the shortfall. Second resistor (Rz)
If (Rs) is set, the charging time becomes a constant value regardless of the temperature.
光肌二重来
以上の通り、本発明によれば定電流の制御用電圧を発生
する抵抗体の温度係数を零とすることができ、また第１
．第２抵抗体のキャンセル量を適当に設定することによ
り負荷との温度係数キャンセルを図ることもできる。As described above, according to the present invention, the temperature coefficient of the resistor that generates the constant current control voltage can be made zero, and the first
．． By appropriately setting the amount of cancellation of the second resistor, it is also possible to cancel the temperature coefficient with the load.
第１図は本発明を実施した定電流回路を示す回路図であ
り、第２図は本発明の他の実施例の回路図である。第３
図は従来例の回路図である。
（Ｒ１）−・・第１抵抗体（負の温度係数の抵抗体）。
（Ｒ５）・・−第２抵抗体（正の温度係数の抵抗体）。
（１＋）−ｍ一定電流。FIG. 1 is a circuit diagram showing a constant current circuit embodying the present invention, and FIG. 2 is a circuit diagram of another embodiment of the present invention. Third
The figure is a circuit diagram of a conventional example. (R1)--First resistor (negative temperature coefficient resistor). (R5)...-Second resistor (resistor with positive temperature coefficient). (1+)-m constant current.
Claims (1)
記電流を定電流とするための制御用電圧として使用する
定電流回路において、前記抵抗体として正の温度係数の
抵抗体と負の温度係数の抵抗体をそれらの温度係数がキ
ャンセルされるように接続構成したことを特徴とする定
電流回路。(1) In a constant current circuit that uses the voltage generated in a resistor when a current flows as a control voltage to make the current a constant current, the resistor is a resistor with a positive temperature coefficient and a resistor with a negative temperature coefficient. A constant current circuit characterized in that resistors are connected so that their temperature coefficients are canceled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63217378A JPH0266613A (en) | 1988-08-31 | 1988-08-31 | Constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63217378A JPH0266613A (en) | 1988-08-31 | 1988-08-31 | Constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0266613A true JPH0266613A (en) | 1990-03-06 |
Family
ID=16703235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63217378A Pending JPH0266613A (en) | 1988-08-31 | 1988-08-31 | Constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0266613A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06169237A (en) * | 1991-09-13 | 1994-06-14 | Mitsubishi Electric Corp | Ring oscillator circuit |
| JP2009005214A (en) * | 2007-06-25 | 2009-01-08 | Ricoh Co Ltd | Clock phase control apparatus |
| US7616050B2 (en) | 2004-12-14 | 2009-11-10 | Atmel Automotive Gmbh | Power supply circuit for producing a reference current with a prescribable temperature dependence |
| JP2009540409A (en) * | 2006-06-07 | 2009-11-19 | オスラム ゲゼルシャフト ミット ベシュレンクテル ハフツング | Temperature compensated current generator for 1V-10V interface |
| JP2010165177A (en) * | 2009-01-15 | 2010-07-29 | Renesas Electronics Corp | Constant current circuit |
| JP2010220178A (en) * | 2009-03-19 | 2010-09-30 | Asahi Kasei Electronics Co Ltd | Delay generation circuit, and constant current source circuit |
-
1988
- 1988-08-31 JP JP63217378A patent/JPH0266613A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06169237A (en) * | 1991-09-13 | 1994-06-14 | Mitsubishi Electric Corp | Ring oscillator circuit |
| US7616050B2 (en) | 2004-12-14 | 2009-11-10 | Atmel Automotive Gmbh | Power supply circuit for producing a reference current with a prescribable temperature dependence |
| JP2009540409A (en) * | 2006-06-07 | 2009-11-19 | オスラム ゲゼルシャフト ミット ベシュレンクテル ハフツング | Temperature compensated current generator for 1V-10V interface |
| KR101478971B1 (en) * | 2006-06-07 | 2015-01-05 | 오스람 게엠베하 | A temperature-compensated current generator, for instance for 1-10v interfaces |
| JP2009005214A (en) * | 2007-06-25 | 2009-01-08 | Ricoh Co Ltd | Clock phase control apparatus |
| JP2010165177A (en) * | 2009-01-15 | 2010-07-29 | Renesas Electronics Corp | Constant current circuit |
| JP2010220178A (en) * | 2009-03-19 | 2010-09-30 | Asahi Kasei Electronics Co Ltd | Delay generation circuit, and constant current source circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1467126A (en) | Current stabilizing arrangement | |
| JPH0266613A (en) | Constant current circuit | |
| JPH01318308A (en) | Logarithmic amplifier | |
| JPH0770935B2 (en) | Differential current amplifier circuit | |
| JPH05183348A (en) | Amplifier circuit | |
| JPH0326435B2 (en) | ||
| JPH01140212A (en) | Low voltage mos reference voltage circuit | |
| JPH0140283Y2 (en) | ||
| RU2023287C1 (en) | Constant voltage regulator | |
| JPS59161192A (en) | Dc bias dependability eliminating circuit | |
| JPS59171822A (en) | Temperature detecting circuit | |
| JPS60675Y2 (en) | Signal addition circuit | |
| JP2573279B2 (en) | Current conversion circuit | |
| JPS584327Y2 (en) | amplifier circuit | |
| JPH0254608A (en) | Constant current circuit | |
| JPS6118457Y2 (en) | ||
| JPH0441611Y2 (en) | ||
| JPS6197577A (en) | Current comparison circuit | |
| JPS59183514A (en) | Variable gain differential amplifier circuit | |
| JPS5912610A (en) | Ocl adapter circuit | |
| JPH0666602B2 (en) | Offset correction circuit | |
| JPS6360433B2 (en) | ||
| JPS555559A (en) | Integrated circuit | |
| JPS6122484B2 (en) | ||
| JPS60250419A (en) | Constant voltage power supply circuit |