JPS637012A - Voltage comparator with built-in hysteresis - Google Patents
Voltage comparator with built-in hysteresisInfo
- Publication number
- JPS637012A JPS637012A JP61151953A JP15195386A JPS637012A JP S637012 A JPS637012 A JP S637012A JP 61151953 A JP61151953 A JP 61151953A JP 15195386 A JP15195386 A JP 15195386A JP S637012 A JPS637012 A JP S637012A
- Authority
- JP
- Japan
- Prior art keywords
- reference potential
- output
- constant current
- hysteresis
- 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
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 1
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ヒステリシスの幅を正確にできるとともに
、素子数の減少が可能なヒステリシス内蔵電圧比較器に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a voltage comparator with a built-in hysteresis that allows for accurate hysteresis width and a reduction in the number of elements.
第２図は従来のヒステリシス内蔵電圧比較器を示す回路
図である。この図において、１，２，８゜９．１０はＮ
ＰＮ型のトランジスタ（以下１−ランジスタをＴｒとい
う）、３〜７はＰＮＰ型のＴ ｒ 。FIG. 2 is a circuit diagram showing a conventional voltage comparator with built-in hysteresis. In this figure, 1, 2, 8°9.10 is N
A PN type transistor (hereinafter 1-transistor will be referred to as Tr), and 3 to 7 are PNP type Tr.
１１は入力端子、１２は出力端子、１３．１４は抵抗器
、１５は基準用電源、１６は電源線、１７は定電流■、
を供給する定電流源、１８は基準電位点である。11 is an input terminal, 12 is an output terminal, 13.14 is a resistor, 15 is a reference power supply, 16 is a power supply line, 17 is a constant current ■,
18 is a reference potential point.
次に動作について説明する。Next, the operation will be explained.
比較される電圧は、入力端子１１からの入力電圧ＶｒＮ
と基準電位点１８の基準電位ＶＰであり、入力電圧Ｖｚ
ｍが基準電位Ｖｐより高い電圧のときは、Ｔｒ２がオン
し、同時にＴ ｒ ４のミラーとして働（Ｔｒ３が飽和
領域に入ることにより、Ｔｒ７．８は作動しない。The voltage to be compared is the input voltage VrN from the input terminal 11
is the reference potential VP of the reference potential point 18, and the input voltage Vz
When m is a voltage higher than the reference potential Vp, Tr2 is turned on and at the same time acts as a mirror of Tr4 (Tr3 enters the saturation region, so Tr7.8 does not operate.
一方、定電流Ｉ２がＴｒ９によって流れ、そのミラーと
してＴｒｌＯが作動しているため抵抗器１４に電流が流
れ、基準電位点１８の基準電位Ｖｐは基準用電源１５の
基準用電圧ｖｒ！＃より抵抗器１４に発生した電圧だけ
ドロップした電圧となっている。ところが、入力電圧ｖ
ｒＮが、ひとたびドロップした基準電位Ｖｐより低下す
るとＴｒ１が作動することになり、同時にＴｒ７のベー
ス電流を引き、Ｔｒ８を駆動し、出力電圧Ｖ ＯＬＩ
丁はＨ′”となっている。On the other hand, since the constant current I2 flows through Tr9 and TrlO operates as a mirror thereof, a current flows through the resistor 14, and the reference potential Vp at the reference potential point 18 becomes the reference voltage vr! of the reference power source 15! The voltage is dropped by the voltage generated in the resistor 14 from #. However, the input voltage v
Once rN falls below the dropped reference potential Vp, Tr1 is activated, and at the same time draws the base current of Tr7, drives Tr8, and output voltage V OLI
The digit is H'''.
そして、Ｔｒ８が飽和領域に入ること（こより、Ｔｒ９
．１０はオンできず、抵抗器１４に流していた電流が流
れず、基準電位Ｖｐば基準用電圧ｖｒ□と等しくなる。Then, Tr8 enters the saturation region (from this, Tr9
．． 10 cannot be turned on, the current flowing through the resistor 14 does not flow, and the reference potential Vp becomes equal to the reference voltage vr□.
このため、初期の状態に戻すためには、入力電圧Ｖ Ｉ
Ｎを抵抗器１４に発生していた電圧分と基準用電圧ｖｒ
ｅｔの和以上に上げてやらなくてはならない。Therefore, in order to return to the initial state, the input voltage V I
N is the voltage generated in the resistor 14 and the reference voltage vr
We have to raise it to more than the sum of et.
すなわち、上記のように構成することで、入力電圧ｖｒ
ｈの小さな変動に対して出力電圧Ｖ ｏｕ Ｔの電位が
振動することを防いでいる。That is, by configuring as above, the input voltage vr
This prevents the potential of the output voltage V out T from oscillating due to small fluctuations in h.
上記のような従来のヒステリシス内蔵電圧比較蓋は、以
上のように構成されているので、ヒステリシス幅を決め
るのにＴｒ５〜Ｔｒ１０などの素子を介さなければなら
ないため、抵抗器１４に流す電流に精度が得られず、ヒ
ステリシスの幅に誤差が生しるうえ、高集積化の要求さ
れるＩＣでは素子数が増えるという問題点があった。Since the conventional voltage comparison lid with built-in hysteresis is configured as described above, it is necessary to pass through elements such as Tr5 to Tr10 to determine the hysteresis width, so the current flowing through the resistor 14 must be controlled with precision. Therefore, there are problems in that an error occurs in the width of the hysteresis, and the number of elements increases in an IC that requires high integration.
乙の発明は、かかる問題点を解決するためになされたも
ので、ヒステリシスの幅を正確にできるとともに、素子
数の減少が可能なヒステリシス内蔵電圧比較器を得るこ
とを目的とする。The invention of B was made to solve this problem, and aims to provide a voltage comparator with built-in hysteresis that can accurately set the hysteresis width and reduce the number of elements.
この発明に係るヒステリシス内蔵電圧比較器は、第１お
よび第２の差動増幅用Ｔｒの一方の出力にその入力を接
続し、その出力を基準電位点に接続した定電流回路を備
えたものである。The voltage comparator with built-in hysteresis according to the present invention includes a constant current circuit whose input is connected to one output of the first and second differential amplifier transistors, and whose output is connected to a reference potential point. be.
この発明においては、第１の差動増幅用Ｔｒのオン、オ
フの状態に対応して定電流回路が動作し、基準電位点の
電圧が変化する。In this invention, the constant current circuit operates in accordance with the on/off state of the first differential amplification transistor, and the voltage at the reference potential point changes.
第１図はこの発明のヒステリシス内蔵電圧比較器の一実
施例を示す回路図である。この図において、第２図と同
一符号は同一部分を示し、１９゜２０は第１および第２
の差動増幅用ＴｒであるＮＰＮ型のＴｒ、２１，２２．
２３はＰＮＰ型のＴｒで定電流■３を供給する定電流回
路を構成する。FIG. 1 is a circuit diagram showing an embodiment of a voltage comparator with built-in hysteresis according to the present invention. In this figure, the same reference numerals as in Fig. 2 indicate the same parts, and 19° and 20 indicate the first and second parts.
NPN type Tr, which is a differential amplification transistor, 21, 22.
Reference numeral 23 is a PNP type Tr, which constitutes a constant current circuit that supplies constant current (3).
すなわち、第１図の実施例では第１の差動増幅用Ｔｒで
ある１９の出力であるコレクタに定電流回路の入力が接
続され、その出力が基準電位点１８に接続されている。That is, in the embodiment shown in FIG. 1, the input of the constant current circuit is connected to the collector which is the output of the first differential amplification transistor 19, and the output thereof is connected to the reference potential point 18.
次に動作について説明する。Next, the operation will be explained.
比較される電圧は、従来同様入力電圧Ｖｚ−と基準電位
Ｖｐである。例えば、入力電圧ｖｒｈが基準電位Ｖｐよ
り高い電圧のときはＴｒ１９のコレクタ電流が流れない
ため、Ｔｒ２１のミラーとして作動するＴｒ２２，２３
も動作せず、出力電圧Ｖｏｕτが“Ｌ ＋＋となり、定
電流Ｉ３は流れない。しかし、入力電圧Ｖｚｈが基準電
位Ｖ ｐ （Ｖ ｐ ＝ Ｖ Ｐ−ｖ）より低くなると
、Ｔｒ２１のミラーとしてＴｒ２２．２３が駆動され、
出力電圧Ｖ ｏｕ Ｔを゛Ｈ″にするとともに、基準電
位Ｖｐを上昇させる。したがって、入力電圧ＶｆＮが一
旦低くなった後は、基準電位Ｖｐは基準用電圧Ｖ ｒｅ
ｌに抵抗器１４に発生した電圧、つまり抵抗＠１４の抵
抗値と定電流Ｉ、との積の分だけ加えた電圧となり、従
来の回路と同様の動作を行うことができる。The voltages to be compared are the input voltage Vz- and the reference potential Vp as in the conventional case. For example, when the input voltage vrh is higher than the reference potential Vp, the collector current of Tr19 does not flow, so Tr22 and 23 act as a mirror of Tr21.
also does not operate, the output voltage Vouτ becomes "L++", and the constant current I3 does not flow. However, when the input voltage Vzh becomes lower than the reference potential V p (V p = V P-v), Tr22. 23 is driven,
The output voltage V out T is set to "H" and the reference potential Vp is increased. Therefore, once the input voltage VfN becomes low, the reference potential Vp becomes the reference voltage V re
The voltage generated in the resistor 14, that is, the product of the resistance value of the resistor @14 and the constant current I, is added to the voltage l, and the same operation as the conventional circuit can be performed.
なお、上記実施例では、ＮＰＮ型のＴｒによる差動増幅
器の構成を示したが、極性をすべて反転させた逆導電型
のＴｒを用いてもよい。In the above embodiment, the configuration of the differential amplifier is shown using NPN type transistors, but reverse conductivity type transistors with all polarities reversed may also be used.
乙の発明【よ以上説明したとおり、第１および第２の差
動増幅用Ｔｒの一方の出力にその入力を接続し、その出
力を基準電位点に接続した定電流回路を備えたので、集
積回路において素子数を減少でき、正確なヒステリシス
を持つヒステリシス内蔵電圧比較器を容易に構成できる
という効果がある。B's invention [As explained above, since it is equipped with a constant current circuit whose input is connected to the output of one of the first and second differential amplifier transistors and whose output is connected to the reference potential point, it is possible to integrate This has the advantage that the number of elements in the circuit can be reduced and a voltage comparator with built-in hysteresis having accurate hysteresis can be easily constructed.
第１図は乙の発明のヒステリシス内蔵電圧比較器の一実
施例を示す回路図、第２図は従来のヒステリシス内蔵電
圧比較蓋を示す回路図である。
図において、１１は入力端子、１２は出力端子、１４は
抵抗器、１５は基準用電源、１６は電源線、１７は定電
流源、１８は基準電位点、１９〜２３はＴｒである。
なお、各図中の同一符号は同一または相当部分を示す。
代理人 大 岩 増 雄 （外２名）第１図FIG. 1 is a circuit diagram showing an embodiment of the voltage comparator with built-in hysteresis according to the invention, and FIG. 2 is a circuit diagram showing a conventional voltage comparison lid with built-in hysteresis. In the figure, 11 is an input terminal, 12 is an output terminal, 14 is a resistor, 15 is a reference power source, 16 is a power line, 17 is a constant current source, 18 is a reference potential point, and 19 to 23 are transistors. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) Figure 1
Claims (1)
、入力端子に接続されて差動増幅器を構成する第１およ
び第２の差動増幅用トランジスタを有するヒステリシス
内蔵電圧比較器において、前記第１および第２の差動増
幅用トランジスタの一方の出力にその入力を接続し、そ
の出力を前記基準電位点に接続した定電流回路を備えた
ことを特徴とするヒステリシス内蔵電圧比較器。In the voltage comparator with built-in hysteresis, the voltage comparator has first and second differential amplification transistors whose emitters are connected to each other and whose bases are respectively connected to a reference potential point and an input terminal to form a differential amplifier. 1. A voltage comparator with built-in hysteresis, comprising a constant current circuit whose input is connected to one output of the second differential amplification transistor, and whose output is connected to the reference potential point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61151953A JPS637012A (en) | 1986-06-27 | 1986-06-27 | Voltage comparator with built-in hysteresis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61151953A JPS637012A (en) | 1986-06-27 | 1986-06-27 | Voltage comparator with built-in hysteresis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS637012A true JPS637012A (en) | 1988-01-12 |
Family
ID=15529815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61151953A Pending JPS637012A (en) | 1986-06-27 | 1986-06-27 | Voltage comparator with built-in hysteresis |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS637012A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01132127U (en) * | 1988-02-29 | 1989-09-07 | ||
| JPH02196509A (en) * | 1989-01-26 | 1990-08-03 | Fuji Photo Film Co Ltd | Hysteresis circuit |
| US20180037180A1 (en) * | 2016-08-05 | 2018-02-08 | Toyota Jidosha Kabushiki Kaisha | Collision detection device for vehicle and collision detection method for vehicle |
-
1986
- 1986-06-27 JP JP61151953A patent/JPS637012A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01132127U (en) * | 1988-02-29 | 1989-09-07 | ||
| JPH02196509A (en) * | 1989-01-26 | 1990-08-03 | Fuji Photo Film Co Ltd | Hysteresis circuit |
| US20180037180A1 (en) * | 2016-08-05 | 2018-02-08 | Toyota Jidosha Kabushiki Kaisha | Collision detection device for vehicle and collision detection method for vehicle |
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