JPH09153774A - Waveform shaping circuit - Google Patents
Waveform shaping circuitInfo
- Publication number
- JPH09153774A JPH09153774A JP33428495A JP33428495A JPH09153774A JP H09153774 A JPH09153774 A JP H09153774A JP 33428495 A JP33428495 A JP 33428495A JP 33428495 A JP33428495 A JP 33428495A JP H09153774 A JPH09153774 A JP H09153774A
- Authority
- JP
- Japan
- Prior art keywords
- waveform shaping
- circuit
- input
- voltage
- shaping circuit
- 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
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は波形成形回路に係
り、特にその入力設定電圧が選択できる機能を有する波
形成形回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform shaping circuit, and more particularly to a waveform shaping circuit having a function of selecting its input set voltage.
【０００２】[0002]
【従来の技術】従来の波形成形回路は、図４に示すよう
に、比較基準電圧となる入力設定電圧が固定電圧（例え
ばＶａ，−Ｖａ）とされた差動アンプＡ１及びＡ２から
なるコンパレータ回路１に入力信号Ｖｉｎが入力され、
差動アンプＡ１及びＡ２の出力がそれぞれフリップフロ
ップ回路２のセット入力Ｓ及びリセット入力Ｒに入力さ
れ、フリップフロップ回路２の出力Ｑより波形成形され
た出力信号Ｖｏｕｔを得ている。2. Description of the Related Art As shown in FIG. 4, a conventional waveform shaping circuit is a comparator circuit including differential amplifiers A1 and A2 in which an input set voltage serving as a comparison reference voltage is a fixed voltage (for example, Va, -Va). Input signal Vin is input to 1,
The outputs of the differential amplifiers A1 and A2 are input to the set input S and the reset input R of the flip-flop circuit 2, respectively, and the waveform-shaped output signal Vout is obtained from the output Q of the flip-flop circuit 2.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記従来の波
形成形回路は、動作環境の変化当の理由でノイズレベル
が変化して入力設定電圧を変更する必要がある場合、そ
の都度固定入力設定電圧を変更したコンパレータ回路を
作らなければならず、回路規模が大きくなるという欠点
があった。本発明の目的は、入力設定電圧を任意に選択
できる波形成形回路を提供するところにある。However, the above-mentioned conventional waveform shaping circuit has a fixed input setting voltage whenever the noise setting changes and the input setting voltage needs to be changed due to a change in the operating environment. However, there is a drawback that the circuit scale becomes large because it is necessary to make a comparator circuit in which An object of the present invention is to provide a waveform shaping circuit capable of arbitrarily selecting an input set voltage.
【０００４】[0004]
【課題を解決するための手段】本発明に係る波形成形回
路は、２つの差動アンプからなるコンパレータ回路と、
該コンパレータ回路の出力で動作するフリップフロップ
回路と、前記２つの差動アンプの入力設定電圧を異なる
電圧値に切り換えるための切り換え手段とからなるもの
である。A waveform shaping circuit according to the present invention includes a comparator circuit including two differential amplifiers,
It comprises a flip-flop circuit which operates by the output of the comparator circuit and a switching means for switching the input set voltage of the two differential amplifiers to different voltage values.
【０００５】また、本発明に係る波形成形回路は、切り
換え手段が異なる電圧値に切り換えるための切り換えス
イッチである。Further, the waveform shaping circuit according to the present invention is a changeover switch for changing over the voltage value by the switching means.
【０００６】また、本発明に係る波形成形回路は、切り
換え手段は異なる電圧値に調整するためのポテンショメ
ータである。Further, in the waveform shaping circuit according to the present invention, the switching means is a potentiometer for adjusting different voltage values.
【０００７】[0007]
【作用】波形成形回路は、２つの差動アンプからなるコ
ンパレータ回路と、コンパレータ回路の出力で動作する
フリップフロップ回路と、２つの差動アンプの入力設定
電圧を異なる電圧値に切り換えるための切り換え手段と
からなる。動作環境の変化等により無信号時のノイズレ
ベルが変動した場合、コンパレータ回路の比較基準電圧
となる入力設定電圧を切り換え手段によりノイズの影響
を受けない値に変更ずることができる。切り換え手段は
切り換えスイッチやポテンショメータを用いることがで
きる。The waveform shaping circuit includes a comparator circuit including two differential amplifiers, a flip-flop circuit that operates by the outputs of the comparator circuits, and a switching means for switching the input set voltage of the two differential amplifiers to different voltage values. Consists of. When the noise level when there is no signal fluctuates due to a change in the operating environment, the input setting voltage serving as the comparison reference voltage of the comparator circuit can be changed to a value that is not affected by noise by the switching means. A changeover switch or a potentiometer can be used as the changeover means.
【０００８】[0008]
【発明の実施の形態】図１は、本発明に係る波形成形回
路の一実施例の回路図である。図１において、差動アン
プＡ１及びＡ２からなるコンパレータ回路１に入力信号
Ｖｉｎが入力され、差動アンプＡ１及びＡ２の出力がそ
れぞれフリップフロップ回路２のセット入力Ｓ及びリセ
ット入力Ｒに入力され、フリップフロップ回路２の出力
Ｑより波形成形された出力信号Ｖｏｕｔを得ている。こ
こで、差動アンプＡ１及びＡ２の基準電圧入力端子に
は、それぞれ切り換えスイッチ３及び４の共通端子３ａ
及び３ｂが接続されている。切り換えスイッチ３の切り
換え端子３ｂ及び３ｃには入力設定電圧（中心電圧Ｖｃ
にＶａ及びＶｂを加えた電圧）Ｖｃ＋Ｖａ及びＶｃ＋Ｖ
ｂ（Ｖｂ＞Ｖａ）が供給され、切り換えスイッチ４の切
り換え端子４ｂ及び４ｃには入力設定電圧（中心電圧Ｖ
ｃに−Ｖａ及び−Ｖｂを加えた電圧）Ｖｃ−Ｖａ及びＶ
ｃ−Ｖｂ（−Ｖａ＞−Ｖｂ）が供給されている。1 is a circuit diagram of an embodiment of a waveform shaping circuit according to the present invention. In FIG. 1, the input signal Vin is input to the comparator circuit 1 including the differential amplifiers A1 and A2, and the outputs of the differential amplifiers A1 and A2 are input to the set input S and the reset input R of the flip-flop circuit 2, respectively. A waveform-shaped output signal Vout is obtained from the output Q of the output circuit 2. Here, the common terminals 3a of the changeover switches 3 and 4 are connected to the reference voltage input terminals of the differential amplifiers A1 and A2, respectively.
And 3b are connected. The input setting voltage (center voltage Vc is applied to the changeover terminals 3b and 3c of the changeover switch 3).
Voltage obtained by adding Va and Vb to Vc + Va and Vc + V
b (Vb> Va) is supplied to the changeover terminals 4b and 4c of the changeover switch 4 and the input setting voltage (center voltage V
voltage obtained by adding -Va and -Vb to c) Vc-Va and V
c-Vb (-Va> -Vb) is supplied.
【０００９】上記の構成において、図２（Ａ）に示すよ
うに、入力設定電圧は、無信号入力時のノイズレベルＶ
ｎ１より上に位置するように切り換えスイッチ３及び４
を切り換え端子３ｂ及び４ｂ側に切り換えてＶｃ＋Ｖａ
及びＶｃ−Ｖａに設定され、このためコンパレータ回路
１の動作はノイズの影響を受けずに安定し、出力信号Ｖ
ｏｕｔは“０”か“１”のどちらかを維持し安定してい
る。ところで、動作環境が変わる等の理由で、図２
（Ｂ）に示すように、無信号入力時のノイズレベルがＶ
ｎ２に高くなった場合はノイズの影響を受けてコンパレ
ータ回路１の動作が安定しなくなるが、ここで、切り換
えスイッチ３及び４を切り換え端子３ｃ及び４ｃ側に切
り換えて入力設定電圧をそれぞれＶｃ＋Ｖａ，Ｖｃ−Ｖ
ａ→Ｖｃ＋Ｖｂ，Ｖｃ−Ｖｂに設定し直すと、再設定後
の入力設定電圧Ｖｂ，−ＶｂはノイズレベルＶｎ２より
上に位置するので、コンパレータ回路１はノイズの影響
を受けることなく安定し、出力信号Ｖｏｕｔは“０”か
“１”のどちらかを維持し安定する。In the above configuration, as shown in FIG. 2A, the input set voltage is the noise level V when no signal is input.
Changeover switches 3 and 4 so as to be located above n1
To Vc + Va by switching to the switching terminals 3b and 4b side.
And Vc-Va, the operation of the comparator circuit 1 is stable without being affected by noise, and the output signal V
out is stable, maintaining either "0" or "1". By the way, as shown in FIG.
As shown in (B), the noise level when no signal is input is V
When n2 becomes high, the operation of the comparator circuit 1 becomes unstable due to the influence of noise, but here, the changeover switches 3 and 4 are changed over to the changeover terminals 3c and 4c to set the input set voltages to Vc + Va and Vc, respectively. -V
If the input setting voltages Vb and -Vb after resetting are set higher than the noise level Vn2 by resetting from a to Vc + Vb and Vc-Vb, the comparator circuit 1 is stable without being affected by noise and output. The signal Vout maintains either "0" or "1" and is stable.
【００１０】なお、上記の例では、切り換えスイッチ３
及び４の切り換え端子が２個の場合を説明したが、これ
に限らず切り換え端子が３個以上で異なる入力設定電圧
を切り換えるように構成することもできる。In the above example, the changeover switch 3
Although the case where the switching terminals 4 and 4 have two switching terminals has been described, the present invention is not limited to this, and it is also possible to have a configuration in which three or more switching terminals switch different input setting voltages.
【００１１】[0011]
【実施例】次に、図３は本発明に係る波形成形回路の他
の実施例の回路図である。図３では、図２の切り換えス
イッチ３及び４に代えて固定電圧源＋Ｖｃ，−Ｖｃに接
続されたポテンショメータ５及び６を備えている。この
構成では、無信号時のノイズレベルの変化に応じてポテ
ンショメータ５及び６の可動端子を調整することによ
り、ノイズの影響を受けない入力設定電圧値を任意に選
択することができる。FIG. 3 is a circuit diagram of another embodiment of the waveform shaping circuit according to the present invention. In FIG. 3, potentiometers 5 and 6 connected to fixed voltage sources + Vc and −Vc are provided instead of the changeover switches 3 and 4 of FIG. With this configuration, by adjusting the movable terminals of the potentiometers 5 and 6 according to the change in the noise level when there is no signal, it is possible to arbitrarily select the input set voltage value that is not affected by noise.
【００１２】[0012]
【発明の効果】本発明に係る波形成形回路によれば、入
力設定電圧を任意に選択できることにより、無入力信号
時のノイズレベルが変化しても波形成形回路を固々に対
応させる必要がなくなる。また、入力設定電圧を変化さ
せ、無入力信号時に波形成形回路の出力を安定させ、後
段の回路への影響をなくすこともできる。According to the waveform shaping circuit of the present invention, since the input setting voltage can be arbitrarily selected, there is no need for the waveform shaping circuit to be fixed even if the noise level at the time of no input signal changes. . It is also possible to change the input set voltage and stabilize the output of the waveform shaping circuit when there is no input signal, thereby eliminating the influence on the circuit at the subsequent stage.
【図１】本発明に係る波形成形回路の一実施例の回路図
である。FIG. 1 is a circuit diagram of an embodiment of a waveform shaping circuit according to the present invention.
【図２】図１の回路の入出力波形図であり、（Ａ）は入
力設定電圧±Ｖａ時、（Ｂ）は入力設定電圧±Ｖｂ時を
示す。2A and 2B are input / output waveform diagrams of the circuit of FIG. 1, where FIG. 2A shows an input set voltage of ± Va, and FIG. 2B shows an input set voltage of ± Vb.
【図３】本発明に係る波形成形回路の他の実施例の回路
図である。FIG. 3 is a circuit diagram of another embodiment of the waveform shaping circuit according to the present invention.
【図４】従来の波形成形回路の回路図である。FIG. 4 is a circuit diagram of a conventional waveform shaping circuit.
１ コンパレータ回路 ２ フリップフロップ回路 ３ 切り換えスイッチ ４ 切り換えスイッチ ５ ポテンショメータ ６ ポテンショメータ 1 Comparator circuit 2 Flip-flop circuit 3 Changeover switch 4 Changeover switch 5 Potentiometer 6 Potentiometer
Claims (3)
回路と、該コンパレータ回路の出力で動作するフリップ
フロップ回路と、前記２つの差動アンプの入力設定電圧
を異なる電圧値に切り換えるための切り換え手段とから
なることを特徴とする波形成形回路。1. A comparator circuit composed of two differential amplifiers, a flip-flop circuit which operates by the outputs of the comparator circuits, and a switching means for switching the input set voltage of the two differential amplifiers to different voltage values. A waveform shaping circuit comprising:
切り換え手段は異なる電圧値に切り換えるための切り換
えスイッチである波形成形回路。2. The waveform shaping circuit according to claim 1, wherein
A waveform shaping circuit in which the switching means is a switching switch for switching between different voltage values.
切り換え手段は異なる電圧値に調整するためのポテンシ
ョメータである波形成形回路。3. The waveform shaping circuit according to claim 1,
A waveform shaping circuit in which the switching means is a potentiometer for adjusting to different voltage values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33428495A JPH09153774A (en) | 1995-11-30 | 1995-11-30 | Waveform shaping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33428495A JPH09153774A (en) | 1995-11-30 | 1995-11-30 | Waveform shaping circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09153774A true JPH09153774A (en) | 1997-06-10 |
Family
ID=18275625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33428495A Pending JPH09153774A (en) | 1995-11-30 | 1995-11-30 | Waveform shaping circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09153774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282182A (en) * | 2006-03-15 | 2007-10-25 | Toyota Central Res & Dev Lab Inc | Binarization circuit |
| JP2013034188A (en) * | 2011-06-28 | 2013-02-14 | General Electric Co <Ge> | Method of utilizing dual comparators to facilitate precision signal rectification and timing system without signal feedback |
-
1995
- 1995-11-30 JP JP33428495A patent/JPH09153774A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007282182A (en) * | 2006-03-15 | 2007-10-25 | Toyota Central Res & Dev Lab Inc | Binarization circuit |
| JP2013034188A (en) * | 2011-06-28 | 2013-02-14 | General Electric Co <Ge> | Method of utilizing dual comparators to facilitate precision signal rectification and timing system without signal feedback |
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