JP2678669B2 - Reference voltage input circuit - Google Patents
Reference voltage input circuitInfo
- Publication number
- JP2678669B2 JP2678669B2 JP1297623A JP29762389A JP2678669B2 JP 2678669 B2 JP2678669 B2 JP 2678669B2 JP 1297623 A JP1297623 A JP 1297623A JP 29762389 A JP29762389 A JP 29762389A JP 2678669 B2 JP2678669 B2 JP 2678669B2
- Authority
- JP
- Japan
- Prior art keywords
- reference voltage
- voltage source
- circuit
- integrated circuit
- built
- 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.)
- Expired - Lifetime
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- Semiconductor Integrated Circuits (AREA)
Description
【発明の詳細な説明】 〔概 要〕 アナログ集積回路に多用される内蔵基準電圧源を有す
る基準電圧入力回路に関し、 外部基準電圧源入力に最低必要な１本の端子を備え、
最小の端子増加数で、集積回路内蔵の基準電圧源と外部
の基準電圧源の切換使用ができるようにし、何れの電源
でも同じ様に内部回路を動作させることができ、集積回
路の利用範囲を拡大できるようにすることを目的とし、 集積回路内部に基準電圧源を持ち、その基準電圧源で
内部回路を動作させる集積回路において、 前記基準電圧源と前記内部回路との間に介装した抵抗
と、該抵抗と前記内部回路との間に介装し、入力インピ
ーダンスを高インピーダンスに保持するインピーダンス
変換回路と、該インピーダンス変換回路と前記抵抗との
間に外部基準電圧源を接続可能に形成した端子とを設け
た構成としたものである。DETAILED DESCRIPTION OF THE INVENTION [Overview] A reference voltage input circuit having a built-in reference voltage source, which is often used in analog integrated circuits, having at least one terminal required for inputting an external reference voltage source,
With the minimum number of terminals, the reference voltage source built in the integrated circuit and the external reference voltage source can be switched and used, the internal circuit can be operated in the same way with any power supply, and the range of use of the integrated circuit can be increased. In an integrated circuit that has a reference voltage source inside the integrated circuit and operates the internal circuit with the reference voltage source for the purpose of enabling expansion, a resistor interposed between the reference voltage source and the internal circuit. And an impedance conversion circuit interposed between the resistor and the internal circuit to hold an input impedance at a high impedance, and an external reference voltage source connectable between the impedance conversion circuit and the resistor. The terminal is provided.
本発明は、アナログ集積回路に多用される内蔵基準電
圧源を有する基準電圧入力回路に関する。The present invention relates to a reference voltage input circuit having a built-in reference voltage source often used in analog integrated circuits.
近年、装置の小型化において、この基準電圧源を集積
回路内に内蔵させるケースが増えてきた。In recent years, in order to miniaturize the device, the number of cases where this reference voltage source is built in an integrated circuit has increased.
しかしながら、この集積回路内の基準電圧源の精度に
は限度があり、利用目的においては外付けの精度の良い
（調整された）基準電圧源を利用しなければならない場
合がある。However, there is a limit to the accuracy of the reference voltage source in this integrated circuit, and it may be necessary to use an external highly accurate (adjusted) reference voltage source for the purpose of use.
従来のアナログ集積回路は、小型化の為に内蔵基準電
圧源専用、即ち外部からの基準電圧源供給不可能に形成
するか、または、高精度を実現する為、小型化を犠牲に
し、外部基準電圧源用の端子を設け、外部に基準電圧源
を持たせて、利用範囲の制限された回路構成をするか、
あるいは、集積回路に内蔵基準電圧源を設けているが、
外部基準電圧源との使い分けが可能になるように集積回
路端子を２本使用し、基準電圧源の種類により接続の仕
方を変更して対応する等の方法を取って、集積回路の利
用範囲拡大を図っている。The conventional analog integrated circuit is designed for exclusive use of the internal reference voltage source for miniaturization, that is, it is formed so that the reference voltage source cannot be supplied from the outside, or at the expense of miniaturization to achieve high accuracy A terminal for the voltage source is provided, and a reference voltage source is provided externally to make a circuit configuration with a limited range of use.
Alternatively, although the integrated circuit has a built-in reference voltage source,
Expand the range of use of the integrated circuit by using two integrated circuit terminals so that it can be used separately from the external reference voltage source, and changing the connection method depending on the type of the reference voltage source. I am trying to
このうち、基準電圧源使い分け可能型集積回路の構成
は、第３図および第４図に示すように、１は内蔵基準電
圧源、１′は外部基準電圧源、２は基準電圧源で作動さ
せられる内部回路、３は集積回路、４は集積回路の端子
を示す。Of these, as shown in FIGS. 3 and 4, the configuration of the reference voltage source selectively usable integrated circuit is as follows: 1 is a built-in reference voltage source, 1'is an external reference voltage source, and 2 is a reference voltage source. The internal circuit, 3 is an integrated circuit, and 4 is a terminal of the integrated circuit.
第３図に示すように、内部基準電圧源使用時には、両
端子4,4間を配線4a等でショートして使用する。また、
第４図に示すように、外部基準電圧源使用時には内部回
路２側の端子４に外部基準電圧源１′を接続し、内蔵基
準電圧源１側の端子４を開放状態にして使用する。As shown in FIG. 3, when the internal reference voltage source is used, both terminals 4 and 4 are short-circuited with a wire 4a or the like. Also,
As shown in FIG. 4, when using the external reference voltage source, the external reference voltage source 1'is connected to the terminal 4 on the internal circuit 2 side, and the terminal 4 on the built-in reference voltage source 1 side is used in an open state.
従来のアナログ集積回路では、各別の集積回路によ
り、内蔵基準電圧源を有する回路と外部基準電圧源を有
する回路とを形成していたため、利用目的に応じた基準
電圧源の選択が出来なかったり、また、集積回路の利用
範囲拡大を図るために、内蔵基準電圧源を設けるととも
に、外部基準電圧源を接続可能に形成したものでは、集
積回路の端子数増加を生じ、性能面や小型化面で上記問
題点を生じていた。In a conventional analog integrated circuit, a circuit having a built-in reference voltage source and a circuit having an external reference voltage source are formed by different integrated circuits, so that the reference voltage source cannot be selected according to the purpose of use. In addition, in order to expand the range of use of the integrated circuit, a built-in reference voltage source is provided, and an external reference voltage source can be connected. Therefore, the above problems occur.
本発明による上記問題点を解消する目的で設定される
技術的課題は、外部基準電圧源入力に最低必要な１本の
端子を備え、最小の端子増加数で、集積回路内蔵の基準
電圧源と外部の基準電圧源の切換使用ができるように
し、何れの電源でも同じ様に内部回路を動作させること
ができ、集積回路の利用範囲を拡大できる基準電圧入力
回路を提供することにある。A technical problem set for the purpose of solving the above-mentioned problems according to the present invention is to provide a reference voltage source with a built-in integrated circuit with a minimum number of terminals, which has at least one terminal for inputting an external reference voltage source. An object of the present invention is to provide a reference voltage input circuit capable of switching and using an external reference voltage source, enabling the internal circuit to operate in the same manner with any power source, and expanding the utilization range of the integrated circuit.
本発明は、上記課題を解決するための具体的な手段と
して、基準電圧入力回路を構成するにあたり、第１図お
よび第２図の実施例図に示すように、集積回路11内部に
基準電圧源12を持ち、その基準電圧源12で内部回路13を
動作させる集積回路11において、前記基準電圧源12と前
記内部回路13との間に介装した抵抗14と、該抵抗14と前
記内部回路13との間に介装し、入力インピーダンスを高
インピーダンスに保持するインピーダンス変換回路15
と、該インピーダンス変換回路15と前記抵抗14との間に
外部基準電圧源17を接続可能に形成した端子16とを設け
たものである。As a concrete means for solving the above problems, the present invention constitutes a reference voltage input circuit by forming a reference voltage source inside an integrated circuit 11 as shown in the embodiment diagrams of FIGS. 1 and 2. In the integrated circuit 11 having the reference voltage source 12 and operating the internal circuit 13 with the reference voltage source 12, the resistor 14 interposed between the reference voltage source 12 and the internal circuit 13, the resistor 14 and the internal circuit 13 Impedance conversion circuit 15 that holds the input impedance at a high impedance
And a terminal 16 formed so that an external reference voltage source 17 can be connected between the impedance conversion circuit 15 and the resistor 14.
本発明は上記構成により、外部基準電圧源17を接続し
ていない場合には、電圧降下を微小な状態にして、基準
電圧源12から抵抗14とインピーダンス変換回路15を介し
て内部回路13に基準電圧を与え、また、外部基準電圧源
17を接続した場合には、抵抗14を介した基準電圧源12の
影響を無視できる状態にして、外部基準電圧源17からイ
ンピーダンス変換回路15を介して内部回路13に基準電圧
を与える。According to the present invention, with the above configuration, when the external reference voltage source 17 is not connected, the voltage drop is set to a minute state, and the reference voltage source 12 references the internal circuit 13 via the resistor 14 and the impedance conversion circuit 15. Voltage and also external reference voltage source
When 17 is connected, the effect of the reference voltage source 12 via the resistor 14 is made negligible, and the reference voltage is applied from the external reference voltage source 17 to the internal circuit 13 via the impedance conversion circuit 15.
以下、本発明の実施例として内蔵基準電圧源と外部基
準電圧源との出力インピーダンスの差異を利用した場合
について図示説明する。Hereinafter, as an embodiment of the present invention, a case where a difference in output impedance between a built-in reference voltage source and an external reference voltage source is used will be illustrated and described.
第１図および第２図は実施例の回路図を示し、第１図
は内蔵基準電圧源使用時を、第２図には外部基準電圧源
使用時を示す。1 and 2 show circuit diagrams of the embodiment, FIG. 1 shows a case where a built-in reference voltage source is used, and FIG. 2 shows a case where an external reference voltage source is used.
11は集積回路、12は集積回路11に内蔵されている内蔵
基準電圧源、13は内蔵基準電圧源12で作動させられる内
部回路、14は（例えば数十Ωの）抵抗、15はボルテージ
・ホロワー等からなるインピーダンス変換回路、16は集
積回路11の外部電源接続用の端子、17は外部基準電圧源
を示す。11 is an integrated circuit, 12 is a built-in reference voltage source built in the integrated circuit 11, 13 is an internal circuit operated by the built-in reference voltage source 12, 14 is a resistor (for example, several tens of Ω), 15 is a voltage follower And the like, 16 is an impedance conversion circuit, 16 is a terminal for connecting an external power source of the integrated circuit 11, and 17 is an external reference voltage source.
この構成例では、内蔵基準電圧源12と内部回路13の接
続を抵抗14とインピーダンス変換回路15とを直列に接続
したラインを介して行うとともに、抵抗14とインピーダ
ンス変換回路15との接続点を集積回路11の電源接続用の
端子16に接続させる。In this configuration example, the internal reference voltage source 12 and the internal circuit 13 are connected via a line in which a resistor 14 and an impedance conversion circuit 15 are connected in series, and a connection point between the resistor 14 and the impedance conversion circuit 15 is integrated. It is connected to the power supply terminal 16 of the circuit 11.
この実施例を用いると、 （ａ）内蔵基準電圧源使用時の場合には、 内蔵基準電圧源12から抵抗14とインピーダンス変換回
路15を介して内部回路13に接続され、内部回路13に内蔵
基準電圧源12から動作電力が供給されている。According to this embodiment, (a) when using the internal reference voltage source, the internal reference voltage source 12 is connected to the internal circuit 13 via the resistor 14 and the impedance conversion circuit 15, and the internal reference voltage source is connected to the internal circuit 13. Operating power is supplied from the voltage source 12.
インピーダンス変換回路15の入力インピーダンスは高
入力インピーダンスに保たれており、例えば、入力電流
ＩがＩμＡ、抵抗14が数十ＫΩの場合に、数十mVであ
り、内蔵基準電圧源12の電圧値数Ｖに対して、１％程度
の誤差に押えられるから、抵抗14の両端の電位差は非常
に小さくなる。The input impedance of the impedance conversion circuit 15 is maintained at a high input impedance. For example, when the input current I is I μA and the resistance 14 is tens of KΩ, it is tens of mV, and the voltage value of the built-in reference voltage source 12 is Since the error is suppressed to about 1% with respect to V, the potential difference across the resistor 14 becomes very small.
従って、内蔵基準電圧源の精度に比べて充分に小さい
誤差になる。Therefore, the error is sufficiently smaller than the accuracy of the built-in reference voltage source.
（ｂ）外部基準電圧源使用の場合には、 外部基準電圧源17は、通常数十Ωの低インピーダンス
の出力インピーダンスである。(B) When an external reference voltage source is used, the external reference voltage source 17 has a low impedance output impedance of usually several tens Ω.
従って、抵抗14が数十ＫΩの場合、インピーダンス変
換回路15に供給される電圧は、内蔵基準電圧源12の影響
が無視出来る状態（基準電圧源間の電位差の1/1000）と
成り、外部の高精度基準電圧源の特性を損なう事が無
い。Therefore, when the resistance 14 is several tens of KΩ, the voltage supplied to the impedance conversion circuit 15 is in a state in which the influence of the built-in reference voltage source 12 can be ignored (1/1000 of the potential difference between the reference voltage sources), and It does not impair the characteristics of the high-precision reference voltage source.
このため、外部基準電圧源使用時には、内蔵基準電圧
源12の供給電圧に関係なく内部回路13を動作させること
ができる。Therefore, when the external reference voltage source is used, the internal circuit 13 can be operated regardless of the supply voltage of the built-in reference voltage source 12.
以上のように本発明では、集積回路11を、外部基準電
圧源17が接続されていない場合には、（内蔵）基準電圧
源12から抵抗14とインピーダンス変換回路15を介して内
部回路13に基準電圧を与え、また、外部基準電圧源17を
接続した場合には、外部基準電圧源17からインピーダン
ス変換回路15を介して内部回路13に基準電圧を与えるよ
うに構成したことにより、集積回路11に設けられた端子
16を１つ使用するだけで、（内蔵）基準電圧源12と外部
基準電圧源17とを利用目的に合わせて使い分けることが
できるようになり、最小の増加端子数で（内蔵）基準電
圧源12と外部基準電圧源17とを使用できる利用範囲の広
い集積回路11が実現できる。As described above, in the present invention, when the external reference voltage source 17 is not connected, the integrated circuit 11 is referenced from the (built-in) reference voltage source 12 to the internal circuit 13 via the resistor 14 and the impedance conversion circuit 15. When a voltage is applied and the external reference voltage source 17 is connected, the integrated circuit 11 is configured so as to apply the reference voltage from the external reference voltage source 17 to the internal circuit 13 via the impedance conversion circuit 15. Provided terminal
By using only one (16), the (internal) reference voltage source 12 and the external reference voltage source 17 can be selectively used according to the purpose of use, and the (internal) reference voltage source 12 can be used with the minimum number of increase terminals. It is possible to realize the integrated circuit 11 having a wide utilization range in which the external reference voltage source 17 and the external reference voltage source 17 can be used.
第１図は実施例を示す回路図、第２図は外部基準電圧源
を接続した実施例を示す回路図、第３図は従来回路の構
成図（内蔵基準電圧源使用時）、第４図は従来回路の構
成図（外部基準電圧源使用時）。 11……集積回路 12……（内蔵）基準電圧源 13……内部回路 14……抵抗 15……インピーダンス変換回路 16……端子 17……外部基準電圧源FIG. 1 is a circuit diagram showing an embodiment, FIG. 2 is a circuit diagram showing an embodiment in which an external reference voltage source is connected, FIG. 3 is a configuration diagram of a conventional circuit (when a built-in reference voltage source is used), and FIG. Is a block diagram of the conventional circuit (when using an external reference voltage source). 11 …… Integrated circuit 12 …… (Built-in) reference voltage source 13 …… Internal circuit 14 …… Resistance 15 …… Impedance conversion circuit 16 …… Terminal 17 …… External reference voltage source
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−232155（ＪＰ，Ａ) 特開 昭62−105460（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-232155 (JP, A) JP-A-62-105460 (JP, A)
Claims (1)
その基準電圧源（12）で内部回路（13）を動作させる集
積回路（11）において、 前記基準電圧源（12）と前記内部回路（13）との間に介
装した抵抗（14）と、 該抵抗（14）と前記内部回路（13）との間に介装し、入
力インピーダンスを高インピーダンスに保持するインピ
ーダンス変換回路（15）と、 該インピーダンス変換回路（15）と前記抵抗（14）との
間に外部基準電圧源（17）を接続可能に形成した端子
（16）と を設けたことを特徴とする基準電圧入力回路。1. A reference voltage source (12) is provided inside the integrated circuit,
In an integrated circuit (11) for operating an internal circuit (13) with the reference voltage source (12), a resistor (14) interposed between the reference voltage source (12) and the internal circuit (13), An impedance conversion circuit (15) interposed between the resistor (14) and the internal circuit (13) to maintain a high input impedance, the impedance conversion circuit (15) and the resistor (14) A reference voltage input circuit, characterized in that a terminal (16) formed to connect an external reference voltage source (17) is provided between the reference voltage input circuit and the terminal (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1297623A JP2678669B2 (en) | 1989-11-17 | 1989-11-17 | Reference voltage input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1297623A JP2678669B2 (en) | 1989-11-17 | 1989-11-17 | Reference voltage input circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03159267A JPH03159267A (en) | 1991-07-09 |
| JP2678669B2 true JP2678669B2 (en) | 1997-11-17 |
Family
ID=17848960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1297623A Expired - Lifetime JP2678669B2 (en) | 1989-11-17 | 1989-11-17 | Reference voltage input circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2678669B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5781000A (en) * | 1995-06-16 | 1998-07-14 | Fujitsu Limited | Power control unit loading test method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62105460A (en) * | 1985-11-01 | 1987-05-15 | Rohm Co Ltd | Integrated circuit |
| JP2721151B2 (en) * | 1986-04-01 | 1998-03-04 | 株式会社東芝 | Semiconductor integrated circuit device |
-
1989
- 1989-11-17 JP JP1297623A patent/JP2678669B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03159267A (en) | 1991-07-09 |
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