JPS637014A - Comparatoe circuit - Google Patents

Comparatoe circuit

Info

Publication number
JPS637014A
JPS637014A JP15198986A JP15198986A JPS637014A JP S637014 A JPS637014 A JP S637014A JP 15198986 A JP15198986 A JP 15198986A JP 15198986 A JP15198986 A JP 15198986A JP S637014 A JPS637014 A JP S637014A
Authority
JP
Japan
Prior art keywords
transistor
base
collector
input
potential
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
JP15198986A
Other languages
Japanese (ja)
Other versions
JPH0834415B2 (en
Inventor
Jiyunichirou Oumaru
王丸 淳一郎
Kiyomitsu Nishimura
西村 清光
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP15198986A priority Critical patent/JPH0834415B2/en
Publication of JPS637014A publication Critical patent/JPS637014A/en
Publication of JPH0834415B2 publication Critical patent/JPH0834415B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K5/00Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/22Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
    • H03K5/24Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
    • H03K5/2409Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using bipolar transistors
    • H03K5/2418Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using bipolar transistors with at least one differential stage

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Manipulation Of Pulses (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To increase the input dynamic range by adopting a constitution so that a transistor (TR) on the current mirror side and a TR on the input side of an input differential pair go to unsaturated. CONSTITUTION:A level shifter 40 consists of a current mirror 20, a TR Q5, a diode D1 and resistors R3, R4. In giving a signal of 'L' level lower than a voltage Vref to an input terminal 1, a TR Q2 is turned on and the level of the base of the TR Q5 is decreased by a voltage R2 I more than the voltage Vcc. The collector potential of a TR Q4 is equal to a base potential with the input signal at an H level, increased by a voltage 2VBE than a voltage VEE with the input signal at an L level and the TR Q4 is not saturated in both the cases. Since the collector of the TR Q1 is connected to the voltage Vcc, even if the base potential is increased up to the voltage Vcc, the TR Q1 is not saturated while the collector and the base have only to reach the equi-potential.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、コンパレータ回路の改良に関するものであ
る。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improvements in comparator circuits.

〔従来の技術〕[Conventional technology]

第2図は、従来のコンパレータ回路を示し、図において
、1は入力端子、2は出力端子、Vccは正電源、■□
は負電源、Vrefはしきい値を決める基準電圧源、Q
l、Q2は入力差動対1oをなすトランジスタ、R1,
R2はそれぞれトランジスタQ1.Q2の負荷抵抗、J
は入力差動対10に流す電流■を供給する定電流源、Q
3.Q4はカレントミラー20を構成するトランジスタ
、R3、R4はカレントミラー20の負荷抵抗、Q5゜
Q6はトランジスタQ3.Q4、抵抗R3,R4ととも
にレベルシフタ30を構成するエミッタフォロワトラン
ジスタ、Qlは出力用オープンコレクタトランジスタ、
R5はトランジスタQ7の負荷抵抗である。
Figure 2 shows a conventional comparator circuit, in which 1 is an input terminal, 2 is an output terminal, Vcc is a positive power supply,
is the negative power supply, Vref is the reference voltage source that determines the threshold value, and Q
l, Q2 are transistors forming the input differential pair 1o, R1,
R2 are transistors Q1. Q2 load resistance, J
is a constant current source that supplies the current ■ flowing through the input differential pair 10, Q
3. Q4 is a transistor constituting the current mirror 20, R3 and R4 are load resistances of the current mirror 20, and Q5 and Q6 are transistors Q3. Q4 is an emitter follower transistor that constitutes the level shifter 30 together with resistors R3 and R4, Ql is an output open collector transistor,
R5 is a load resistance of transistor Q7.

次に動作について説明する。入力端子1にVrefより
高い“H”の信号が入ったとき、トランジスタQ2はオ
フとなり、トランジスタQ5のベース電位はほぼ■。と
なる。このときトランジスタQ3のコレクタ電流は(V
cc+Vt*  2 Vat) /R3となる。−方、
トランジスタQ6のベースはトランジスタQ1がオンす
るためVccよりR1・Iだけ下る。そのためトランジ
スタQ6のエミッタ電流は、(Vcc+Vzt  2V
++t  R1・I)/R4となる。トランジスタQ4
のコレクタ電流はトランジスタQ3のコレクタ電流と等
しくなるので、R3−R4とすると、トランジスタQ4
のコレクタ電流とトランジスタQ6のエミッタ電流との
差R1・I/R3がトランジスタQ7のベースから引き
抜かれる電流I!+Lとなり、トランジスタQ7がオフ
し、出力端子2が“H”となる。
Next, the operation will be explained. When an "H" signal higher than Vref is input to input terminal 1, transistor Q2 is turned off, and the base potential of transistor Q5 is approximately ■. becomes. At this time, the collector current of transistor Q3 is (V
cc+Vt*2Vat)/R3. - way,
The base of the transistor Q6 is lower than Vcc by R1·I since the transistor Q1 is turned on. Therefore, the emitter current of transistor Q6 is (Vcc+Vzt 2V
++t R1・I)/R4. Transistor Q4
Since the collector current of is equal to the collector current of transistor Q3, if R3-R4, then transistor Q4
The difference R1·I/R3 between the collector current of and the emitter current of transistor Q6 is the current I! drawn from the base of transistor Q7. +L, transistor Q7 is turned off, and output terminal 2 becomes "H".

−方、入力端子1にVrefより低い“L″の信号が入
ったときは、上記の逆の動作となりR2・1/R3がト
ランジスタQ7のベースに流れ込む電流■、となり、ト
ランジスタQ7がオンし、出力端子2がL”となる。
- On the other hand, when an "L" signal lower than Vref is input to the input terminal 1, the operation is the opposite of the above, and R2.1/R3 becomes a current flowing into the base of the transistor Q7, turning on the transistor Q7. Output terminal 2 becomes L''.

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

従来のコンパレータ回路は、以上のように構成されてい
るので、トランジスタQ4はトランジスタQ7をオフす
るために飽和することが必要で、また、トランジスタQ
1は負荷R1が接続されているために飽和しやすく、入
力ダイナミックレンジを大きくとれないなどの問題点が
あった。
Since the conventional comparator circuit is configured as described above, transistor Q4 needs to be saturated in order to turn off transistor Q7, and transistor Q4 needs to be saturated in order to turn off transistor Q7.
1 has problems such as being easily saturated due to the connection of the load R1 and not being able to provide a large input dynamic range.

この発明は上記のような問題点を解消するためになされ
たもので、トランジスタの飽和を防ぎ高速動作ができる
とともに、入力ダイナミックレンジを太き(とることが
できるコンパレータ回路を得ることを目的とする。
This invention was made to solve the above problems, and aims to provide a comparator circuit that can prevent transistor saturation, operate at high speed, and widen the input dynamic range. .

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

この発明に係るコンパレータ回路は、レベルシフタを構
成するカレントミラーにおいて、ζラー側のトランジス
タの負荷としてダイオード及び抵抗を用いるようにした
ものである。
A comparator circuit according to the present invention uses a diode and a resistor as a load for a transistor on the ζ error side in a current mirror constituting a level shifter.

また入力差動対の入力トランジスタの負荷抵抗なくした
ものである。
Also, the load resistance of the input transistors of the input differential pair is eliminated.

〔作用〕[Effect]

この発明においては、レベルシフタはこれを構成するカ
レントミラーの基準側の負荷のエミッタフォロワトラン
ジスタのベースがHm、即ちほぼvccになったとき、
基準側とカレントミラー側の負荷が等価となり、ミラー
側のトランジスタのコレクタ電位が、基準側のトランジ
スタのコレクタ電位、即ち、共通ベース電位と等しくな
るから、ミラー側の飽和が防止される。
In this invention, when the base of the emitter follower transistor of the load on the reference side of the current mirror constituting the level shifter becomes Hm, that is, approximately Vcc,
The loads on the reference side and the current mirror side become equal, and the collector potential of the transistor on the mirror side becomes equal to the collector potential of the transistor on the reference side, that is, the common base potential, so saturation on the mirror side is prevented.

また人力差動対の入力トランジスタの負荷抵抗が除去さ
れているから入力ダイナミックレンジが大きくなる。
Furthermore, since the load resistance of the input transistors of the manual differential pair is removed, the input dynamic range is increased.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。゛第
1図は本発明の一実施例によるコンパレータ回路を示し
、図において、1は入力端子、2は出力端子、vCcは
正電源、voは負電源、Vrefはしきい値を決める基
準電圧源、Ql、Q2は入力差動対10をなす第5.第
4のトランジスタ、R2はトランジスタQ2の負荷抵抗
(第3の抵抗)、Jは入力差動対10に流す電流Iを供
給する定電流源であり、上記入力差動対10、抵抗R2
及び定電流源Jにより入力段50が構成されている。
An embodiment of the present invention will be described below with reference to the drawings.゛Figure 1 shows a comparator circuit according to an embodiment of the present invention, in which 1 is an input terminal, 2 is an output terminal, vCc is a positive power supply, vo is a negative power supply, and Vref is a reference voltage source that determines the threshold value. , Ql, and Q2 are the fifth . The fourth transistor, R2, is a load resistance (third resistance) of the transistor Q2, and J is a constant current source that supplies the current I flowing to the input differential pair 10, and the input differential pair 10, the resistor R2
and a constant current source J constitute an input stage 50.

またQ3.Q4はカレントミラー20をなす第2、第3
のトランジスタ、R3,R4はカレントミラー20の負
荷抵抗(第1.第2の抵抗)、Q5はトランジスタQ3
の負荷となるエミッタフォロワトランジスタ(第1のト
ランジスタ)、D1はトランジスタQ4の負荷となるダ
イオード、Q7は出力用オーブンコレクタトランジスタ
、R5はトランジスタQ7の負荷抵抗、D2はトランジ
スタQ7を■、よりvIltだけ持ち上げるためのダイ
オードであり、上記カレントミラー20.トランジスタ
Q5.ダイオードD1及び抵抗R3,R4によりレベル
シフタ40が構成されている。
Also Q3. Q4 is the second and third part of the current mirror 20.
transistors, R3 and R4 are the load resistances (first and second resistances) of the current mirror 20, and Q5 is the transistor Q3.
Emitter follower transistor (first transistor) that serves as a load for transistor Q4, D1 is a diode that serves as a load for transistor Q4, Q7 is an oven collector transistor for output, R5 is a load resistance for transistor Q7, D2 is This is a diode for lifting the current mirror 20. Transistor Q5. A level shifter 40 is configured by a diode D1 and resistors R3 and R4.

次に動作について説明する。入力端子1にVrefより
高い“H″の信号が入ったとき、トランジスタQ2はオ
フとなり、トランジスタQ5のベースはほぼvccとな
り、このとき該トランジスタQ5はアノードがvccに
接続されたダイオードと等価となる。R3=R4とする
とトランジスタQ3゜Q4のコレクタ電位は等しくなり
、v!E惨よりV□分高い電位になる。このことにより
トランジスタQ7のベース電位も■。よりvIltだけ
上昇し、ダイオードD2によりゃはり■。よりvIlt
分高いそのエミッタ電位と同電位となり、トランジスタ
Q7はオフし、出力端子2は1H”となる。
Next, the operation will be explained. When an "H" signal higher than Vref is input to input terminal 1, transistor Q2 is turned off, and the base of transistor Q5 becomes approximately vcc, and at this time, transistor Q5 becomes equivalent to a diode whose anode is connected to vcc. . When R3=R4, the collector potentials of transistors Q3 and Q4 are equal, and v! The potential will be V□ higher than E. As a result, the base potential of transistor Q7 also becomes ■. It increases by vIlt, and is changed by diode D2. More vIlt
The potential becomes the same as the emitter potential which is higher by that amount, transistor Q7 is turned off, and output terminal 2 becomes 1H''.

−方、入力端子1にVrefより低い“L”の信号が入
ったときは、トランジスタQ2はオンとなり、トランジ
スタQ5のベースはVCCよりR2・Iだけ下る。この
ためトランジスタQ3のコレクタ電流は(Vcc+’V
H2Vmi  R2・I ) / R3となる。このと
きダイオードD1を流れる電流は(Vcc + Vtt
  3 Vat) / R4となり、R3=R4,R2
・I>V□とすると、この2つの電流の差(R2・I−
V□)/R3がトランジスタQ7のベースに流れ込む電
流I□となり、トランジスタQ7はオンし、出力端子2
は“L”となる。
- On the other hand, when an "L" signal lower than Vref is input to input terminal 1, transistor Q2 is turned on, and the base of transistor Q5 is lowered by R2·I than VCC. Therefore, the collector current of transistor Q3 is (Vcc+'V
H2Vmi R2・I)/R3. At this time, the current flowing through the diode D1 is (Vcc + Vtt
3 Vat) / R4, R3=R4,R2
・If I>V□, the difference between these two currents (R2・I−
V□)/R3 becomes a current I□ flowing into the base of transistor Q7, transistor Q7 is turned on, and output terminal 2
becomes “L”.

トランジスタQ4のコレクタ電位は、入力信号“H”の
ときベース電位と等しく、入力信号“L”のときvoよ
り2Vmz分高くなり、いずれの場合もトランジスタQ
4は飽和しない。またトランジスタQ1のコレクタはv
Ccに接続されているので、入力、即ちベース電位がV
CCまで上ってもコレクタ、ベースが同電位となるだけ
で、トランジスタQ1は飽和しない。
The collector potential of transistor Q4 is equal to the base potential when the input signal is "H", and is higher than vo by 2 Vmz when the input signal is "L"; in both cases, the collector potential of transistor Q4 is equal to the base potential when the input signal is "H".
4 is not saturated. Also, the collector of transistor Q1 is v
Since it is connected to Cc, the input, that is, the base potential is V
Even if it goes up to CC, the collector and base will just be at the same potential, and the transistor Q1 will not be saturated.

なお、上記実施例では、出力段にオーブンコレクタ及び
負荷抵抗を使用したものを示したが、負荷抵抗の代りに
能動負荷を用いてもよいし、オーブンコレクタ以外の出
力形式を用いてもよく、上記実施例と同様の効果を奏す
る。
In addition, in the above embodiment, an oven collector and a load resistor are used in the output stage, but an active load may be used instead of the load resistor, or an output format other than the oven collector may be used. The same effects as in the above embodiment are achieved.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明に係るコンパレータ回路によれ
ば、カレントミラー側のトランジスタと入力差動対の入
力側のトランジスタが不飽和になるように構成したので
、高速動作が可能となり、゛     入力ダイナミッ
クレンジ を大きくできるという効果がある。
As described above, according to the comparator circuit according to the present invention, since the transistor on the current mirror side and the transistor on the input side of the input differential pair are configured to be unsaturated, high-speed operation is possible. This has the effect of increasing the range.

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

第1図は、この発明の一実施例によるコンパレータ回路
を示す図、第2図は従来のコンパレータ回路を示す図で
ある。 図において、R5,R3,R4,R2,R1は第1.第
2.第3.第4.第5のトランジスタ、Dlはダイオー
ド、R3,R4,R2は第1.第2、第3の抵抗、40
はレベルシフタ、50は入力段、1は入力端子、2は出
力端子、10は入力差動対、20はカレントミラー、V
ccは正電源、Vyyは負電源である。 なお図中同一符号は同−又は相当部分を示す。
FIG. 1 is a diagram showing a comparator circuit according to an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional comparator circuit. In the figure, R5, R3, R4, R2, R1 are the first. Second. Third. 4th. The fifth transistor, Dl is a diode, R3, R4, R2 are the first. 2nd and 3rd resistors, 40
is a level shifter, 50 is an input stage, 1 is an input terminal, 2 is an output terminal, 10 is an input differential pair, 20 is a current mirror, V
cc is a positive power supply, and Vyy is a negative power supply. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

【特許請求の範囲】[Claims] (1)コレクタが正電源に接続されエミッタフォロアを
なす第1のトランジスタと、 エミッタが負電源にコレクタがベースに接続されダイオ
ードをなす第2のトランジスタと、上記第1のトランジ
スタのエミッタと上記第2のトランジスタのコレクタ及
びベースとの間に接続された第1の抵抗と、 ベースが上記第2のトランジスタのコレクタ及びベース
にエミッタが上記負電源に接続された第3のトランジス
タと、 アノードが上記正電源に接続されたダイオードと、 該ダイオードのカソードと上記第3のトランジスタのコ
レクタとの間に接続された第2の抵抗とで構成されるレ
ベルシフタを備えたことを特徴とするコンパレータ回路
(1) A first transistor whose collector is connected to a positive power supply and forms an emitter follower; a second transistor whose emitter is connected to a negative power supply and whose collector is connected to its base and which forms a diode; the emitter of the first transistor and the second transistor; a first resistor connected between the collector and base of the second transistor, a third transistor whose base is connected to the collector and base of the second transistor, and whose emitter is connected to the negative power supply; A comparator circuit comprising: a level shifter comprising: a diode connected to a positive power source; and a second resistor connected between the cathode of the diode and the collector of the third transistor.
(2)上記レベルシフタの前段には、 上記第1のトランジスタのベースと上記正電源との間に
接続された第3の抵抗と、 コレクタが上記第1のトランジスタのベースにベースが
基準電圧源に接続された第4のトランジスタと、 エミッタが上記第4のトランジスタのエミッタにコレク
タが上記正電源に接続されベースが入力端子となる第5
のトランジスタと、 上記第4、第5のトランジスタの共通のエミッタと上記
負電源との間に接続された定電源とで構成された入力段
が設けられていることを特徴とする特許請求の範囲第1
項記載のコンパレータ回路。
(2) In the preceding stage of the level shifter, a third resistor is connected between the base of the first transistor and the positive power supply, the collector is connected to the base of the first transistor, and the base is connected to the reference voltage source. a fifth transistor whose emitter is connected to the emitter of the fourth transistor and whose collector is connected to the positive power supply and whose base is an input terminal;
and a constant power source connected between the common emitter of the fourth and fifth transistors and the negative power source. 1st
Comparator circuit described in section.
JP15198986A 1986-06-27 1986-06-27 Comparator circuit Expired - Lifetime JPH0834415B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15198986A JPH0834415B2 (en) 1986-06-27 1986-06-27 Comparator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15198986A JPH0834415B2 (en) 1986-06-27 1986-06-27 Comparator circuit

Publications (2)

Publication Number Publication Date
JPS637014A true JPS637014A (en) 1988-01-12
JPH0834415B2 JPH0834415B2 (en) 1996-03-29

Family

ID=15530628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15198986A Expired - Lifetime JPH0834415B2 (en) 1986-06-27 1986-06-27 Comparator circuit

Country Status (1)

Country Link
JP (1) JPH0834415B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208014A (en) * 1988-02-15 1989-08-22 Matsushita Electric Ind Co Ltd Switching circuit
US6191635B1 (en) 1998-09-03 2001-02-20 Telefonaktiebolaget Lm Ericsson Level shifting circuit having a fixed output common mode level

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208014A (en) * 1988-02-15 1989-08-22 Matsushita Electric Ind Co Ltd Switching circuit
US6191635B1 (en) 1998-09-03 2001-02-20 Telefonaktiebolaget Lm Ericsson Level shifting circuit having a fixed output common mode level

Also Published As

Publication number Publication date
JPH0834415B2 (en) 1996-03-29

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