JPS61120515A - Hysteresis circuit - Google Patents

Hysteresis circuit

Info

Publication number
JPS61120515A
JPS61120515A JP59241008A JP24100884A JPS61120515A JP S61120515 A JPS61120515 A JP S61120515A JP 59241008 A JP59241008 A JP 59241008A JP 24100884 A JP24100884 A JP 24100884A JP S61120515 A JPS61120515 A JP S61120515A
Authority
JP
Japan
Prior art keywords
voltage
electrode
mos transistor
voltage comparator
gate electrode
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
Application number
JP59241008A
Other languages
Japanese (ja)
Other versions
JPH0576207B2 (en
Inventor
Masahisa Nemoto
正久 根本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP59241008A priority Critical patent/JPS61120515A/en
Publication of JPS61120515A publication Critical patent/JPS61120515A/en
Publication of JPH0576207B2 publication Critical patent/JPH0576207B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K3/00Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/353Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/356Bistable circuits
    • H03K3/3565Bistables with hysteresis, e.g. Schmitt trigger

Abstract

PURPOSE:To constitute a circuit which is suitable for integration by setting hysteresis width on the basis of the channel width ratio of MOS transistors (TR), and connecting the output of a voltage comparator to the gate electrode of an MOS TR. CONSTITUTION:The gate electrode and drain electrode of an MOSTR 5 are connected to a power source in common with the drain electrode of an MOSTR 7, source electrodes of the MOSTRs 5 and 7 and a substrate are connected to the drain electrode and gate electrode of an MOSTR 6 and the reference voltage input 2 of the voltage comparator 1, and the source electrode of the MOSTR 6 and substrate are grounded. The voltage of the reference voltage input of the circuit is set at the channel width ratio of the MOSTRs 5-7. Further, currents flowing through the MOSTRs are set small by increasing the channel length, so the current consumption is reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明t4MOSトランジスタで構成されたヒステリシ
ス回路に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hysteresis circuit constructed of t4MOS transistors.

〔従来の技術〕[Conventional technology]

従来、ヒステリシス回路として、第2図に示す電圧比較
器21及び3個の抵抗25,26.27t−Vして構成
され7?+回路が知られて^る。本例は電源間に抵抗2
5.26が縦続接続され、抵抗δと抵抗26の接続点は
電圧比較器21の基準電圧入力端子22に接続されると
共に、抵抗27の一端に接続され、抵抗27の他端に、
電圧比較器21の出力24に接続されて構成されて層る
。電圧比較器21は、基準電圧入力端子22と信号入力
端子23とを有し、信号入力端子23の電圧レベルt−
V工、基準電圧入力端子22の電圧レベル1kvRとす
ると、vxくv几の時は出力端子24の電圧レベルは電
源電圧vDDと同一電圧レベルが出力され、■、〉vR
の時は、出力端子24の電圧レベルはOVが出力される
Conventionally, a hysteresis circuit has been constructed with a voltage comparator 21 and three resistors 25 and 26.27t-V as shown in FIG. +The circuit is known^. In this example, there is 2 resistors between the power supplies.
5.26 are connected in cascade, the connection point between the resistor δ and the resistor 26 is connected to the reference voltage input terminal 22 of the voltage comparator 21, and also connected to one end of the resistor 27, and the other end of the resistor 27 is connected to the reference voltage input terminal 22 of the voltage comparator 21.
The voltage comparator 21 is configured to be connected to the output 24 of the voltage comparator 21 . The voltage comparator 21 has a reference voltage input terminal 22 and a signal input terminal 23, and has a voltage level t- of the signal input terminal 23.
Assuming that the voltage level of the reference voltage input terminal 22 is 1 kvR, the voltage level of the output terminal 24 is the same as the power supply voltage vDD when vx is 1kvR.
At this time, the voltage level of the output terminal 24 is OV.

抵抗25.26,27の抵抗値上それぞれR25゜R2
6,几27 であるとすると、基準電圧入力端子22の
電圧VnlL  入力信号端子23の電圧v1ゐ状態に
=ってVRH,vRL の2状態金有し、それぞれ次式
で表わされる。
The resistance values of resistors 25, 26 and 27 are each R25°R2
6, 几27, the voltage VnlL of the reference voltage input terminal 22 and the voltage v1 of the input signal terminal 23 have two states, VRH and vRL, which are respectively expressed by the following equations.

(i)  V 1 < V BOR; Vu u;Vn
 n x (R25+ R2r )■ VI>VBo時
; VBL==:V、Dx(Rz s−R+z 7/(
R25vRH>v、、 ”c”、s D、vXがovか
らvDD へ上昇する場合は出力24の電圧は、V工=
V□でvDDからOvへ変化し、逆にVがvDDからO
vへ変化する場合t!VI=VBUでOvからvDDへ
変化し、第3図に示すヒステリシスを有する入・出力特
性となる。
(i) V 1 < V BOR; Vu u; Vn
n x (R25+R2r)■ When VI>VBo; VBL==:V, Dx(Rz s-R+z 7/(
R25vRH>v, ``c'', s D, If vX rises from ov to vDD, the voltage at output 24 is V
V□ changes from vDD to Ov, and conversely, V changes from vDD to Ov.
When changing to v, t! When VI=VBU, it changes from Ov to vDD, resulting in the input/output characteristics having hysteresis as shown in FIG.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述したヒステリシス回路のヒステリシス幅(VB H
−N’B X、、 以下略) ” VBΔV=Vnnx
((R2S、外z 6 )/I (R25//R,2s
 )+Rz 7 ))        ・・・・・・・
・・・・・・・・ (3)で表わされるが、Δvt−小
さく設定する場合には、上式りり明らかなように、抵抗
値几25.R26に比較して抵抗値R27t−大きな値
にする必要がある。
The hysteresis width (VB H
-N'B
((R2S, outside z 6 )/I (R25//R, 2s
)+Rz 7)) ・・・・・・・・・
・・・・・・・・・ It is expressed as (3), but when setting Δvt to a small value, as is clear from the above formula, the resistance value ⇒25. It is necessary to set the resistance value R27t to a larger value than R26.

例、l、vDD=5vとして、ΔV=50mV (!:
 f ;Es j!6合にla  Rgs=Rzs と
して、Rzs:R,zs:几27=1:1:49.5の
比率となる。
Example, l, vDD=5v, ΔV=50mV (!:
f ; Es j! Assuming that la Rgs=Rzs in the sixth case, the ratio is Rzs:R,zs:几27=1:1:49.5.

一般に、上述した回路等を集積化する場合、高抵抗値の
抵抗を得る事は、チップサイズの増大金招く事から、比
較的低抵抗値の抵抗を使用せざるを得ない為に、電源間
に接続された抵抗25.26に大きな電流を流す事にな
り、消費電流が大きくなるという欠点が有る。また、上
記説明におけるヒステリシス幅ΔVの精度を良くする為
には、電圧比較器21の出力インピーダンスは、十分に
低くする必要があり、電圧比比較器21f:MOSトラ
ンジスタで構成し、低い出力インピーダンスを得るには
、大きなサイズのMOSトランジスタで構成する事が必
要となり、この事も、集積化する上での問題点となって
いる。
Generally, when integrating the above-mentioned circuits, obtaining a resistor with a high resistance value increases the chip size, so it is necessary to use a resistor with a relatively low resistance value, so it is necessary to use a resistor with a relatively low resistance value. This has the disadvantage that a large current flows through the resistors 25 and 26 connected to the resistors 25 and 26, resulting in increased current consumption. In addition, in order to improve the accuracy of the hysteresis width ΔV in the above explanation, the output impedance of the voltage comparator 21 needs to be sufficiently low, and the voltage ratio comparator 21f is configured with a MOS transistor to have a low output impedance. In order to obtain this, it is necessary to configure it with large-sized MOS transistors, which also poses a problem in terms of integration.

本発明の目的は、消費電流が少なく、また、電圧比較器
の出力インピーダンスの影響金堂けない、集積化に適し
た、ヒステリシス回路上提供することである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a hysteresis circuit that consumes less current, is less affected by the output impedance of a voltage comparator, and is suitable for integration.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は第1.第2.第3の3個のMOSトランジスタ
と電圧比較器とを有し、第1V)MUSトランジスタの
ドレイン電極とゲート電極及び第2のMOSトランジス
タのドレイン電極に共通に第1の電圧源に接続され、第
1及び第2のMOSトランジスタのソース電極及び基板
は共通に、第3のMOSトランジスタのドレイン電極と
ゲート電極及び電圧比較器の基準電圧入力端子に接続さ
れ、第2のMOSトランジスタのゲート電極は電圧比較
器の出力に接続され、第3のMOSトランジスタのソー
ス電極と基板は第2の電圧源に接続されて構成されるヒ
ステリシス回路を得る。
The present invention is the first. Second. a third MOS transistor and a voltage comparator, the drain electrode and gate electrode of the first V) MUS transistor and the drain electrode of the second MOS transistor are commonly connected to the first voltage source; The source electrode and substrate of the first and second MOS transistors are commonly connected to the drain electrode and gate electrode of the third MOS transistor and the reference voltage input terminal of the voltage comparator, and the gate electrode of the second MOS transistor is connected to the voltage A hysteresis circuit is obtained by being connected to the output of the comparator, and the source electrode and substrate of the third MOS transistor being connected to the second voltage source.

〔実施例〕〔Example〕

次・に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は、本発明の一実施例の回路図である。FIG. 1 is a circuit diagram of an embodiment of the present invention.

本実施例は、N型のMOSトランジスタで構成すれる電
圧比較器1と、3個のN型のMOSトランジスタ5,6
.7t−有し、MOSトランジスタ5のゲート電極と、
ドレイン電極は、MOSトランジスタフのドレイン電極
と共通に電源に接続され、MOSトランジスタ5.7の
ソース電極と基板はMOSトランジスタ6のドレイン電
極とゲート電極及び電圧比較器10基単電圧入カ2に接
続され、MOSトランジスタフのゲート電極鉱電圧比較
器lの出力4に接続され、MOSトランジスタロのソー
ス電極と基板は接地されて構成されている。
This embodiment includes a voltage comparator 1 composed of an N-type MOS transistor, and three N-type MOS transistors 5 and 6.
.. 7t-, and the gate electrode of the MOS transistor 5;
The drain electrode is connected to the power supply in common with the drain electrode of the MOS transistor 5.7, and the source electrode and substrate of the MOS transistor 5.7 are connected to the drain electrode and gate electrode of the MOS transistor 6, and to the single voltage input 2 of the 10 voltage comparators. The gate electrode of the MOS transistor is connected to the output 4 of the voltage comparator l, and the source electrode and substrate of the MOS transistor are grounded.

電圧比較器1は基準電圧入力2の電圧をVB、信号人力
3の電圧ヲv工とするとs VI<VBの時は電源と同
じ電圧vDDが出力され、VX)V、の時に接地電圧O
Vが出力される。
The voltage comparator 1 outputs the voltage of the reference voltage input 2 as VB, and the voltage of the signal input 3 as s.When VI<VB, the same voltage vDD as the power supply is output, and when VX)V, the ground voltage O
V is output.

一般にMOSトランジスタのドレイン電流式は但し、K
は導電係数、Wはチャネル幅、Lはチャネル長%v03
はゲート・ソー ス間電圧、v7は閾値電圧 で表わされる。β=に−W/Lとして、3個の厭トラン
ジスタ5,6.7のβをそれぞれβ5.β・。
In general, the drain current equation for a MOS transistor is, however, K
is the conductivity coefficient, W is the channel width, and L is the channel length %v03
is the gate-source voltage, and v7 is the threshold voltage. Assuming that β= -W/L, β of the three negative transistors 5 and 6.7 is β5. β・.

β7で表し、VI(V、  の時の基準電圧入力の電圧
’k Va H,V X> VB の時の基準電圧入力
の電圧f VB L <!: Tルト、s vRH,v
a a ”■ VX(V、のとき ■ VI>vX%のとき となる0式(5)1式(6)Kオイテ、vRH>vRL
  o関係が成立し、VIがOvからvo へ上昇する
ときは、vX=VBHで電圧比較器1の出方電圧は、V
n DカラG V ニ変化L vn t! ’%rRI
I トナD、V。
It is expressed as β7, and the voltage of the reference voltage input when VI (V, ) is the voltage of the reference voltage input when 'k Va H, V
a a ” ■ When VX (V, ■ When VI > vX%, 0 formula (5) 1 formula (6) K oite, vRH > vRL
o relationship is established and VI rises from Ov to vo, vX=VBH and the output voltage of voltage comparator 1 is V
n D Kara G V Ni change L vn t! '%rRI
I Tona D, V.

がvDDからQVへ下降するときは% vZ”vRLで
電圧比較器1の出力電圧はQVからvDDに変化しVB
はVRHとなるので、第3図に示すヒステリシス特性が
得られる。
When the voltage drops from vDD to QV, the output voltage of voltage comparator 1 changes from QV to vDD at % vZ”vRL and VB
becomes VRH, so the hysteresis characteristic shown in FIG. 3 is obtained.

本例において、3個のM(J8トランジスタのチャネル
長Lft、同一にしてあり、この場合、上式(5)、 
(6)は、MOSトランジスタ5,6.7のチャネル幅
をWs、Ws、W? とすると、・Vア      ・
・・・・・曲・川(7)と誉ける。te、式(7)、 
(8)の 第2項は、V□。
In this example, the channel lengths Lft of the three M(J8 transistors) are the same, and in this case, the above equation (5),
(6) is the channel width of MOS transistors 5, 6.7 Ws, Ws, W? Then, ・Va ・
・・・・・・Praise as a song/river (7). te, formula (7),
The second term in (8) is V□.

vR5t″、電源電圧の172付近に設定する限り、第
1項に比べ無視でき、 VBH中VDD/(x+JWsア(W5+W7))・・
・・・・・・・・・・・・・ (9)と近似7る事カテ
キ、VRH,Vll  u、MOSトランジスタ5,6
.7のチャネル幅の比で設定できる@ vaH−vnr
、  t−電[を圧o10%、例、tば、V  =sv
 V、、=L525V、 V、、=Z475V トD TbVCu、Ws :W6 :W7=1 : 1.04
 : 0.083 )比となるエラに、MOSトランジ
スタサイズのチャネル幅を選択すれば良い。
As long as vR5t'' is set to around 172 of the power supply voltage, it can be ignored compared to the first term, and VDD/(x+JWsA(W5+W7)) during VBH...
・・・・・・・・・・・・(9) and approximation 7 Category: VRH, Vll u, MOS transistors 5, 6
.. @ vaH-vnr which can be set with a channel width ratio of 7
, t-voltage [pressure o10%, e.g., tbar, V = sv
V,,=L525V, V,,=Z475V tD TbVCu,Ws :W6 :W7=1 : 1.04
: 0.083) The channel width of the MOS transistor size may be selected to give an error of the ratio: 0.083).

明らかに、前述した従来例での抵抗比に比べ、サイズ比
が小さくて済む事がわかる。また、VRは、上述しt工
うに、MOSトランジスタのサイズだけで表わされるた
めに、電圧比較器の出方インピーダンスが大きい場合で
も、影響は受けない。
It is clearly seen that the size ratio can be smaller than the resistance ratio in the conventional example described above. Further, as mentioned above, since VR is expressed only by the size of the MOS transistor, it is not affected even if the output impedance of the voltage comparator is large.

さらに、MOSトランジスタに流れる電流は、式(4)
で示されるように、チャネル長りを大きくする事で、小
さく設定できるtめ、電源の消費電流を減少させる事が
できる。
Furthermore, the current flowing through the MOS transistor is expressed by equation (4)
As shown in , by increasing the channel length, the current consumption of the power supply can be reduced because t can be set smaller.

以上はMOSトランジスタ5,6.7とl、てN型のも
のを用いた場合であるが、MOS トランジスタ5,6
.7としてP型のものを用いることもできる。この時基
板電極はソースお↓びドレイン電極の5ち電源側のもの
に接続され、MOS)うンジスタ5,6のゲート電極は
ソースおよびドレイン電極のうち接地側のものに接続さ
れる。MOSトランジスタ7のソース・ドレイン電極間
はMOSトランジスタ6のソース・ドレイン電極間と並
列に接続される。
The above is a case where MOS transistors 5, 6.7 and 1 are of N type, but MOS transistors 5, 6.
.. As 7, a P-type material can also be used. At this time, the substrate electrode is connected to one of the source and drain electrodes 5 on the power supply side, and the gate electrodes of the MOS transistors 5 and 6 are connected to the ground side of the source and drain electrodes. The source and drain electrodes of MOS transistor 7 are connected in parallel with the source and drain electrodes of MOS transistor 6.

〔発明の効果〕〔Effect of the invention〕

以上、説明したように、本発明によれば、ヒステリシス
幅6M08トランジスタのチャネル幅の比によって設定
できると共に、電圧比較器の出力が、MOSトランジス
タのゲート電極に接続されているため、電圧比較器の出
力インピーダンスの影響は無視でき、MOSトランジス
タで構成された出力インピーダンスの高い電圧比較器を
使用できる他、MOSトランジスタのチャネル長は、ヒ
ステリシス幅に影響を与えずに設定できるために、電流
t−最適化できる等、集積化に適したヒステリシス回路
が得られる。
As described above, according to the present invention, the hysteresis width can be set by the ratio of the channel width of the 6M08 transistor, and since the output of the voltage comparator is connected to the gate electrode of the MOS transistor, The influence of the output impedance can be ignored, and a voltage comparator with high output impedance made up of MOS transistors can be used. In addition, the channel length of the MOS transistor can be set without affecting the hysteresis width, so the current t-optimal A hysteresis circuit suitable for integration can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例にLるヒステリシス回路の回
路図、第2図は従来のヒステリシス回路の回路図、第3
図はヒステリシス特性を示す図である。 l、21・・・・・・電圧比較器、2.22・・・・・
・信号入力、3,23・・・・・・基準電圧入力、4.
24・・・・・出力、5,6.7・・・・・・N型MO
Sトランジスタ、25.26.27・山・・抵抗、8,
28・・・・・・電源。 #1図 帛 2 図
Figure 1 is a circuit diagram of a hysteresis circuit according to an embodiment of the present invention, Figure 2 is a circuit diagram of a conventional hysteresis circuit, and Figure 3 is a circuit diagram of a conventional hysteresis circuit.
The figure is a diagram showing hysteresis characteristics. l, 21... Voltage comparator, 2.22...
- Signal input, 3, 23...Reference voltage input, 4.
24...Output, 5,6.7...N type MO
S transistor, 25.26.27・mountain...resistance, 8,
28...Power supply. #1 Diagram 2 Diagram

Claims (4)

【特許請求の範囲】[Claims] (1)電圧比較器及び第1、第2、第3の3個のMOS
トランジスタを有し、前記第1のMOSトランジスタの
ドレイン電極とゲート電極及び前記第2のMOSトラン
ジスタのドレイン電極は共通に第1の電圧源に接続され
、前記第1及び第2のMOSトランジスタのソース電極
及び基板電極は共通に前記第3のMOSトランジスタの
ドレイン電極とゲート電極及び前記電圧比較器の基準入
力端子に接続され、前記第2のMOSトランジスタのゲ
ート電極は前記電圧比較器の出力に接続され、前記第3
のMOSトランジスタのソース電極と基板電極は前記第
2の電圧源に接続されている事を特徴とするヒステリシ
ス回路。
(1) Voltage comparator and three MOSs: first, second, and third
a transistor, the drain electrode and gate electrode of the first MOS transistor and the drain electrode of the second MOS transistor are commonly connected to a first voltage source, and the sources of the first and second MOS transistors are connected to a first voltage source. The electrode and the substrate electrode are commonly connected to the drain electrode and gate electrode of the third MOS transistor and the reference input terminal of the voltage comparator, and the gate electrode of the second MOS transistor is connected to the output of the voltage comparator. and the third
A hysteresis circuit characterized in that a source electrode and a substrate electrode of the MOS transistor are connected to the second voltage source.
(2)前記第1、第2および第3のMOSトランジスタ
は、N型MOSトランジスタである事を特徴とする特許
請求の範囲第1項記載のヒステリシス回路。
(2) The hysteresis circuit according to claim 1, wherein the first, second, and third MOS transistors are N-type MOS transistors.
(3)前記第1、第2および第3のMOSトランジスタ
はP型MOSトランジスタである事を特徴とする特許請
求の範囲第1項記載のヒステリシス回路。
(3) The hysteresis circuit according to claim 1, wherein the first, second and third MOS transistors are P-type MOS transistors.
(4)前記電圧比較器は、MOSトランジスタで構成さ
れたことを特徴とする特許請求の範囲第1項、第2項ま
たは第3項記載のヒステリシス回路。
(4) The hysteresis circuit according to claim 1, 2, or 3, wherein the voltage comparator is composed of a MOS transistor.
JP59241008A 1984-11-15 1984-11-15 Hysteresis circuit Granted JPS61120515A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59241008A JPS61120515A (en) 1984-11-15 1984-11-15 Hysteresis circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59241008A JPS61120515A (en) 1984-11-15 1984-11-15 Hysteresis circuit

Publications (2)

Publication Number Publication Date
JPS61120515A true JPS61120515A (en) 1986-06-07
JPH0576207B2 JPH0576207B2 (en) 1993-10-22

Family

ID=17067954

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59241008A Granted JPS61120515A (en) 1984-11-15 1984-11-15 Hysteresis circuit

Country Status (1)

Country Link
JP (1) JPS61120515A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05133984A (en) * 1991-11-12 1993-05-28 Kawasaki Steel Corp Comparator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5553919A (en) * 1978-10-17 1980-04-19 Mitsubishi Electric Corp Variation detecting circuit
JPS57111116A (en) * 1980-12-26 1982-07-10 Fujitsu Ltd Comparator having hysteresis

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5553919A (en) * 1978-10-17 1980-04-19 Mitsubishi Electric Corp Variation detecting circuit
JPS57111116A (en) * 1980-12-26 1982-07-10 Fujitsu Ltd Comparator having hysteresis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05133984A (en) * 1991-11-12 1993-05-28 Kawasaki Steel Corp Comparator

Also Published As

Publication number Publication date
JPH0576207B2 (en) 1993-10-22

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