JPH07131489A - Receiving circuit for light signal - Google Patents
Receiving circuit for light signalInfo
- Publication number
- JPH07131489A JPH07131489A JP5271848A JP27184893A JPH07131489A JP H07131489 A JPH07131489 A JP H07131489A JP 5271848 A JP5271848 A JP 5271848A JP 27184893 A JP27184893 A JP 27184893A JP H07131489 A JPH07131489 A JP H07131489A
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- JP
- Japan
- Prior art keywords
- peak value
- signal
- amplifier
- circuit
- detection 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.)
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- Noise Elimination (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は光信号を電気信号に再
生する光信号受信回路に係り、特に光データリンクに使
用される光信号受信回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical signal receiving circuit for reproducing an optical signal into an electric signal, and more particularly to an optical signal receiving circuit used for an optical data link.
【０００２】[0002]
【従来の技術】この種の光信号受信回路として従来では
例えば特公昭６３−２５７３８号公報に記載されている
ものが良く知られており、その回路構成を図４に示す。
すなわち、光信号は受光素子31で電気信号に変換され
る。この受光素子31で変換された電気信号は増幅器32で
増幅され、比較器33の（＋）側入力端子に供給される。2. Description of the Related Art As an optical signal receiving circuit of this kind, the one described in Japanese Patent Publication No. 63-25738 is well known in the prior art, and the circuit configuration is shown in FIG.
That is, the optical signal is converted into an electric signal by the light receiving element 31. The electric signal converted by the light receiving element 31 is amplified by the amplifier 32 and supplied to the (+) side input terminal of the comparator 33.
【０００３】また、上記増幅器32と同様に構成された基
準電圧発生回路34が設けられており、増幅器32とこの基
準電圧発生回路34の出力端子相互間には等価な抵抗値を
持つ一対の抵抗35、36が直列接続されている。そして、
上記一対の抵抗35、36の直列接続点の信号が、差動増幅
器37、ダイオード38及びキャパシタ39からなるピーク値
検出回路40に供給される。このピーク値検出回路40では
上記増幅器32と基準電圧発生回路34の各出力信号の中間
のレベルを持つ信号のピーク値が検出され、これが上記
比較器33の（−）側入力端子に供給されて両信号が比較
される。A reference voltage generating circuit 34 having the same structure as that of the amplifier 32 is provided, and a pair of resistors having equivalent resistance values are provided between the amplifier 32 and the output terminals of the reference voltage generating circuit 34. 35 and 36 are connected in series. And
A signal at the series connection point of the pair of resistors 35 and 36 is supplied to a peak value detection circuit 40 including a differential amplifier 37, a diode 38 and a capacitor 39. The peak value detection circuit 40 detects the peak value of a signal having an intermediate level between the output signals of the amplifier 32 and the reference voltage generation circuit 34, and this is supplied to the (-) side input terminal of the comparator 33. Both signals are compared.
【０００４】また、ピーク値検出回路40の出力端子に接
続された電流源41と入力側に接続された抵抗42により、
無信号時のオフセット電圧がピーク値検出回路40に供給
されるようになっている。Further, by the current source 41 connected to the output terminal of the peak value detection circuit 40 and the resistor 42 connected to the input side,
The offset voltage when there is no signal is supplied to the peak value detection circuit 40.
【０００５】このような構成でなる光信号受信回路にお
いて、光信号が入力し、それに対応した電気信号が増幅
器32で増幅され、比較器33の（＋）側入力端子に入力さ
れる。また、一対の抵抗35、36及びピーク値検出回路40
により、増幅器32からの出力信号の１／２のレベルの信
号電圧が比較器33の（−）側入力端子にしきい値として
入力される。そして、比較器33で両入力信号が比較され
ることにより、光信号の光強度に依存せずに、安定した
パルス信号が出力される。In the optical signal receiving circuit having such a configuration, an optical signal is input, an electric signal corresponding to the optical signal is amplified by the amplifier 32, and is input to the (+) side input terminal of the comparator 33. Also, a pair of resistors 35 and 36 and a peak value detection circuit 40
As a result, the signal voltage at a level half that of the output signal from the amplifier 32 is input as a threshold value to the (−) side input terminal of the comparator 33. Then, the comparator 33 compares the both input signals, and a stable pulse signal is output without depending on the light intensity of the optical signal.
【０００６】一方、光信号がないときは、上記オフセッ
ト電圧により、比較器33の出力信号は論理“Ｌ”レベル
に固定される。このような構成の光信号受信回路では直
流信号の受信も可能であるが、増幅器32及び基準電圧発
生回路34それぞれの内部で使用されるバイポーラトラン
ジスタのベース・エミッタ間電圧の相対的なばらつき等
の影響により、無信号時の直流バイアス点が全く同一値
とはならず、前記オフセット電圧はこの点を考慮して高
めに設定しなければならず、この結果、感度が低下する
と共に最小受信電力の悪化をもたらすという欠点があ
る。On the other hand, when there is no optical signal, the output signal of the comparator 33 is fixed to the logic "L" level by the offset voltage. Although the optical signal receiving circuit having such a configuration can also receive a DC signal, such as relative variations in the base-emitter voltage of the bipolar transistors used inside the amplifier 32 and the reference voltage generating circuit 34, etc. Due to the influence, the DC bias point at the time of no signal does not have the same value, and the offset voltage must be set to a higher value in consideration of this point, as a result, the sensitivity is lowered and the minimum received power is reduced. It has the drawback of causing deterioration.
【０００７】一方、ＡＣ（交流）結合方式によれば上記
のような問題は解決することができる。この場合には例
えば図５に示すような構成の回路が考えられる。すなわ
ち、この回路は、前記増幅器32と比較器33を結合コンデ
ンサ43を介して接続するもので、このような構成とする
ことにより最小受信電力を上げることができる。On the other hand, the AC (alternating current) coupling method can solve the above problems. In this case, for example, a circuit having the configuration shown in FIG. 5 can be considered. That is, in this circuit, the amplifier 32 and the comparator 33 are connected via the coupling capacitor 43. With such a configuration, the minimum reception power can be increased.
【０００８】しかるにこの方式では、無信号時には増幅
器32の雑音が出力信号に現れるという欠点がある。ま
た、ＡＣ結合の時定数により決まる時間だけ始めの光信
号が再生できないという欠点もある。However, this system has a drawback that noise of the amplifier 32 appears in the output signal when there is no signal. There is also a drawback that the initial optical signal cannot be reproduced for a time determined by the AC-coupling time constant.
【０００９】[0009]
【発明が解決しようとする課題】このように従来の光信
号受信回路では感度が低下すると共に最小受信電力が悪
化するという欠点があり、これを改善しようとすると無
信号時に出力信号に雑音が現れると共に無信号時から始
めの光信号が再生できないという欠点がある。As described above, in the conventional optical signal receiving circuit, there is a drawback that the sensitivity is lowered and the minimum receiving power is deteriorated, and if it is attempted to improve this, noise appears in the output signal when there is no signal. At the same time, there is a drawback that the optical signal starting from the time of no signal cannot be reproduced.
【００１０】この発明は上記のような事情を考慮してな
されたものであり、その目的は、高感度で無信号時の雑
音もなく、なおかつ無信号時から光信号を再生すること
ができる光信号受信回路を提供することにある。The present invention has been made in consideration of the above circumstances, and an object thereof is to provide an optical signal which has high sensitivity and is free from noise when there is no signal, and which can reproduce an optical signal even when there is no signal. It is to provide a signal receiving circuit.
【００１１】[0011]
【課題を解決するための手段】第１の発明の光信号受信
回路は、光信号を電気信号に変換する受光素子と、上記
受光素子で変換された電気信号を増幅する増幅器と、上
記増幅器の出力信号のピーク値を検出する第１のピーク
値検出回路と、上記第１のピーク値検出回路の出力端子
と上記増幅器の出力端子との間に直列接続され、互いに
等価な抵抗値を持つ一対の抵抗素子と、上記増幅器の出
力信号を基準にして上記一対の抵抗素子の直列接続点の
信号のピーク値を検出する第２のピーク値検出回路と、
上記第２のピーク値検出回路に所定のオフセット電圧を
供給するオフセット電圧発生回路と、上記第１、第２の
ピーク値検出回路の出力電圧を比較する比較器とを具備
したことを特徴とする。An optical signal receiving circuit according to a first aspect of the present invention includes a light receiving element for converting an optical signal into an electric signal, an amplifier for amplifying the electric signal converted by the light receiving element, and an amplifier for the amplifier. A first peak value detection circuit for detecting a peak value of an output signal, and a pair connected in series between the output terminal of the first peak value detection circuit and the output terminal of the amplifier and having resistance values equivalent to each other. A resistance element and a second peak value detection circuit for detecting the peak value of the signal at the series connection point of the pair of resistance elements with reference to the output signal of the amplifier.
An offset voltage generating circuit for supplying a predetermined offset voltage to the second peak value detecting circuit and a comparator for comparing output voltages of the first and second peak value detecting circuits are provided. .
【００１２】第２の発明の光信号受信回路は、光信号を
電気信号に変換する受光素子と、上記受光素子で変換さ
れた電気信号を増幅する増幅器と、上記増幅器の出力信
号のピーク値を検出する第１のピーク値検出回路と、上
記増幅器の出力信号を基準にして上記第１のピーク値検
出回路の出力信号のピーク値を検出する第２のピーク値
検出回路と、上記増幅器の出力端子と上記第２のピーク
値検出回路の出力端子との間に直列接続され、互いに等
価な抵抗値を持つ一対の抵抗素子と、上記第２のピーク
値検出回路に所定のオフセット電圧を供給するオフセッ
ト電圧発生回路と、上記第１のピーク値検出回路の出力
電圧と上記一対の抵抗素子の直列接続点の信号の電圧と
を比較する比較器とを具備したことを特徴とする。An optical signal receiving circuit according to a second aspect of the present invention includes a light receiving element for converting an optical signal into an electric signal, an amplifier for amplifying the electric signal converted by the light receiving element, and a peak value of an output signal of the amplifier. A first peak value detection circuit for detecting, a second peak value detection circuit for detecting the peak value of the output signal of the first peak value detection circuit based on the output signal of the amplifier, and an output of the amplifier A pair of resistance elements connected in series between the terminal and the output terminal of the second peak value detection circuit and having equivalent resistance values, and a predetermined offset voltage are supplied to the second peak value detection circuit. An offset voltage generation circuit and a comparator for comparing the output voltage of the first peak value detection circuit with the voltage of the signal at the series connection point of the pair of resistance elements are provided.
【００１３】[0013]
【作用】第１の発明の光信号受信回路では、増幅器の出
力信号のピーク値が第１のピーク値検出回路で検出さ
れ、比較器に供給される。一方、第１のピーク値検出回
路の出力信号と増幅器の出力信号の中間レベルの信号が
一対の抵抗素子によって形成され、第２のピーク値検出
回路によって上記増幅器の出力信号を基準にしてこの中
間レベルの信号のピーク値が検出され、比較器に供給さ
れる。また、オフセット電圧発生回路によって発生され
る所定のオフセット電圧が第２のピーク値検出回路に供
給される。In the optical signal receiving circuit of the first invention, the peak value of the output signal of the amplifier is detected by the first peak value detecting circuit and supplied to the comparator. On the other hand, an intermediate-level signal between the output signal of the first peak value detection circuit and the output signal of the amplifier is formed by a pair of resistance elements, and the intermediate level signal is generated by the second peak value detection circuit with reference to the output signal of the amplifier. The peak value of the level signal is detected and supplied to the comparator. Further, the predetermined offset voltage generated by the offset voltage generation circuit is supplied to the second peak value detection circuit.
【００１４】第２の発明の光信号受信回路では、増幅器
の出力信号のピーク値が第１のピーク値検出回路で検出
され、比較器に供給される。一方、第１のピーク値検出
回路の出力信号のピーク値が第２のピーク値検出回路で
検出され、この第２のピーク値検出回路の出力信号と増
幅器の出力信号の中間レベルの信号が一対の抵抗素子に
よって形成され、比較器に供給される。また、オフセッ
ト電圧発生回路によって発生される所定のオフセット電
圧が第２のピーク値検出回路に供給される。In the optical signal receiving circuit of the second invention, the peak value of the output signal of the amplifier is detected by the first peak value detecting circuit and supplied to the comparator. On the other hand, the peak value of the output signal of the first peak value detection circuit is detected by the second peak value detection circuit, and an intermediate level signal between the output signal of the second peak value detection circuit and the output signal of the amplifier is paired. Is formed by a resistance element of and is supplied to the comparator. Further, the predetermined offset voltage generated by the offset voltage generation circuit is supplied to the second peak value detection circuit.
【００１５】[0015]
【実施例】以下、図面を参照してこの発明を実施例によ
り説明する。図１はこの発明に係る光信号受信回路の第
１の実施例の構成を示す回路図である。11は例えばホト
ダイオードで構成され、光信号を電気信号に変換する受
光素子であり、カソードは電源電圧の印加点に接続され
ており、アノードは増幅器12の入力端子に接続されてい
る。上記受光素子11で変換された電気信号はこの増幅器
12で増幅される。上記増幅器12の出力信号Ｖａは第１の
ピーク値検出回路13に供給される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. 1 is a circuit diagram showing the configuration of a first embodiment of an optical signal receiving circuit according to the present invention. Reference numeral 11 is, for example, a photodiode, which is a light-receiving element that converts an optical signal into an electric signal. The cathode is connected to the application point of the power supply voltage, and the anode is connected to the input terminal of the amplifier 12. The electric signal converted by the light receiving element 11 is the amplifier.
Amplified by 12. The output signal Va of the amplifier 12 is supplied to the first peak value detection circuit 13.
【００１６】この第１のピーク値検出回路13は、差動増
幅器14、この差動増幅器14の出力端子にアノードが接続
されたダイオード15、このダイオード15のカソードに一
端が接続され他端が接地電圧の印加点に接続されたキャ
パシタ16とから構成され、差動増幅器14の（＋）側入力
端子には上記信号Ｖａが、（−）側入力端子にはダイオ
ード15とキャパシタ16との接続点の信号がそれぞれ供給
され、上記増幅器12の出力信号Ｖａのピーク値を検出
し、信号Ｖｂとして出力する。The first peak value detection circuit 13 includes a differential amplifier 14, a diode 15 having an anode connected to the output terminal of the differential amplifier 14, one end of which is connected to the cathode of the diode 15 and the other end of which is grounded. The differential amplifier 14 is connected to a voltage application point, and the signal Va is applied to the (+) side input terminal of the differential amplifier 14, and the connection point between the diode 15 and the capacitor 16 is applied to the (-) side input terminal. Are supplied to detect the peak value of the output signal Va of the amplifier 12 and output it as a signal Vb.
【００１７】また、上記第１のピーク値検出回路13の出
力端子と上記増幅器12の出力端子との間には等価な抵抗
値を持つ一対の抵抗17、18が直列接続されている。この
一対の抵抗17、18は、第１のピーク値検出回路13の出力
信号Ｖｂと増幅器12の出力信号Ｖａとの中間のレベルを
持つ信号Ｖｃを発生する。この中間レベル信号Ｖｃは第
２のピーク値検出回路19に供給される。A pair of resistors 17 and 18 having an equivalent resistance value are connected in series between the output terminal of the first peak value detection circuit 13 and the output terminal of the amplifier 12. The pair of resistors 17 and 18 generate a signal Vc having an intermediate level between the output signal Vb of the first peak value detection circuit 13 and the output signal Va of the amplifier 12. This intermediate level signal Vc is supplied to the second peak value detection circuit 19.
【００１８】上記第２のピーク値検出回路19は、上記第
１のピーク値検出回路13と同様に差動増幅器14、ダイオ
ード15及びキャパシタ16とから構成されており、キャパ
シタ16の他端は第１のピーク値検出回路13の場合とは異
なり上記増幅器12の出力端子に接続されている。すなわ
ち、この第２のピーク値検出回路19は、上記増幅器12の
出力信号Ｖａを基準にして上記中間レベル信号Ｖｃのピ
ーク値を検出し、信号Ｖｄとして出力する。また、電流
源20と抵抗21から構成され、所定値のオフセット電圧を
発生するオフセット電圧発生回路22が設けられており、
ここで発生されたオフセット電圧は第２のピーク値検出
回路19に供給される。The second peak value detection circuit 19 is composed of a differential amplifier 14, a diode 15 and a capacitor 16 like the first peak value detection circuit 13, and the other end of the capacitor 16 is a first peak value detection circuit 13. Unlike the case of the peak value detection circuit 13 of No. 1, it is connected to the output terminal of the amplifier 12. That is, the second peak value detection circuit 19 detects the peak value of the intermediate level signal Vc based on the output signal Va of the amplifier 12 and outputs it as the signal Vd. Further, an offset voltage generation circuit 22 configured to generate an offset voltage having a predetermined value, which includes a current source 20 and a resistor 21, is provided,
The offset voltage generated here is supplied to the second peak value detection circuit 19.
【００１９】上記第１のピーク値検出回路13の出力信号
Ｖｂは比較器23の（＋）側入力端子に、第２のピーク値
検出回路19の出力信号Ｖｄは比較器23の（−）側入力端
子にそれぞれ供給される。The output signal Vb of the first peak value detecting circuit 13 is input to the (+) side input terminal of the comparator 23, and the output signal Vd of the second peak value detecting circuit 19 is the (-) side of the comparator 23. It is supplied to each input terminal.
【００２０】次に上記構成でなる回路の動作を説明す
る。まず、無信号時は、増幅器12の出力信号Ｖａと、第
１のピーク値検出回路13の出力信号Ｖｂ及び中間レベル
信号Ｖｃの電圧はそれぞれ等しくなる。また、オフセッ
ト電圧発生回路22において、電流源20の電流値をＩｇ、
抵抗21の抵抗値をＲｇとすると、第２のピーク値検出回
路19の出力電圧Ｖｄは、Ｖａに比べてＩｇＲｇだけ高く
なる。従って、次の式が成立する。Next, the operation of the circuit configured as described above will be described. First, when there is no signal, the output signal Va of the amplifier 12, the output signal Vb of the first peak value detection circuit 13 and the voltage of the intermediate level signal Vc are equal to each other. In the offset voltage generating circuit 22, the current value of the current source 20 is set to Ig,
When the resistance value of the resistor 21 is Rg, the output voltage Vd of the second peak value detection circuit 19 is higher than Va by IgRg. Therefore, the following equation holds.
【００２１】 Ｖａ＝Ｖｂ＝Ｖｃ … １ Ｖｄ＝Ｖａ＋ＩｇＲｇ＝Ｖｂ＋ＩｇＲｇ … ２ すなわち、無信号時には、比較器23の（−）側入力端子
の電圧は（＋）側入力端子の電圧に比べてＩｇＲｇのオ
フセット電圧だけ高くなり、比較器23の出力信号Ｖｏは
論理“Ｌ”レベルに固定される。このとき、この出力信
号Ｖｏには増幅器12の雑音は現れない。Va = Vb = Vc ... 1 Vd = Va + IgRg = Vb + IgRg ... 2 That is, when there is no signal, the voltage of the (−) side input terminal of the comparator 23 is offset by IgRg compared with the voltage of the (+) side input terminal. The voltage rises, and the output signal Vo of the comparator 23 is fixed to the logic "L" level. At this time, noise of the amplifier 12 does not appear in the output signal Vo.
【００２２】次に光信号が入射した場合の動作を図２の
波形図を用いて説明する。光信号が受光素子11に入射
し、増幅器12により受光素子11からの電流信号ｉが増幅
されて、その出力信号Ｖａとして受光素子11の電流信号
ｉと逆相の電圧信号Ｖａが得られる。この信号Ｖａが第
１のピーク値検出回路13に供給されることにより、信号
Ｖａのピーク値が検出され、Ｖｂが得られる。次にＶａ
の信号を基準（図ではこれをＶａ′として表している）
にＶｂの信号を観測するとＶｂ′の波形となる。第２の
ピーク値検出回路19は、Ｖａの信号を基準（Ｖａ′）に
Ｖｂ′の１／２の値の信号のピーク値を検出し、その出
力信号を図２中ではＶｄ′として表している。比較器23
では、Ｖｂ′（Ｖｂ）の信号が、この信号Ｖｂ′（Ｖ
ｂ）の１／２のレベルを持つしきい値用のＶｄ′（Ｖ
ｄ）信号と比較され、その出力には光信号に対応した正
確なパルス幅の信号Ｖｏが出力される。すなわち、無信
号時から光信号を安定に再生することができる。Next, the operation when an optical signal is incident will be described with reference to the waveform diagram of FIG. An optical signal is incident on the light receiving element 11, the current signal i from the light receiving element 11 is amplified by the amplifier 12, and a voltage signal Va having a phase opposite to the current signal i of the light receiving element 11 is obtained as its output signal Va. By supplying this signal Va to the first peak value detection circuit 13, the peak value of the signal Va is detected and Vb is obtained. Next Va
Signal (referenced as Va 'in the figure)
When a Vb signal is observed, a Vb ′ waveform is obtained. The second peak value detection circuit 19 detects the peak value of the signal having a value of 1/2 of Vb 'with respect to the Va signal as a reference (Va'), and the output signal thereof is represented as Vd 'in FIG. There is. Comparator 23
Then, the signal of Vb '(Vb) is
Vd '(V
d) The signal Vo is compared, and the signal Vo having an accurate pulse width corresponding to the optical signal is output to the output. That is, the optical signal can be stably reproduced even when there is no signal.
【００２３】また、増幅器12と別回路で従来のような基
準電圧発生回路を設ける必要もなく、その電圧誤差を補
償するために第２のピーク値検出回路19に対して余分の
オフセット電圧を与える必要がないため、高感度化が実
現できる。Further, it is not necessary to provide a reference voltage generating circuit as a circuit separate from the amplifier 12, and an extra offset voltage is given to the second peak value detecting circuit 19 in order to compensate the voltage error. Since it is not necessary, high sensitivity can be realized.
【００２４】このように上記実施例回路によれば、高感
度で無信号時の雑音もなく、なおかつ無信号時から光信
号を再生することができる。図３はこの発明に係る光信
号受信回路の第２の実施例の構成を示す回路図である。
上記図１に示す第１の実施例回路では、第１のピーク値
検出回路13の出力信号Ｖｂと増幅器12の出力信号Ｖａと
の中間のレベルを持つ信号Ｖｃを発生させた後に、この
中間レベル信号Ｖｃのピーク値を第２のピーク値検出回
路19で検出するようにしていたが、この第２の実施例回
路では、第１のピーク値検出回路13の出力信号Ｖｂのピ
ーク値を第２のピーク値検出回路19で検出した後、この
第２のピーク値検出回路19の出力信号と増幅器12の出力
信号Ｖａとの中間のレベルを持つ信号を発生させ、比較
器23にしきい値電圧として供給するようにしたものであ
る。As described above, according to the circuit of the above embodiment, it is possible to reproduce the optical signal with high sensitivity and without noise when there is no signal, and also when there is no signal. FIG. 3 is a circuit diagram showing the configuration of the second embodiment of the optical signal receiving circuit according to the present invention.
In the circuit of the first embodiment shown in FIG. 1, after the signal Vc having an intermediate level between the output signal Vb of the first peak value detection circuit 13 and the output signal Va of the amplifier 12 is generated, this intermediate level is generated. Although the peak value of the signal Vc is detected by the second peak value detecting circuit 19, in the second embodiment circuit, the peak value of the output signal Vb of the first peak value detecting circuit 13 is changed to the second value. Of the second peak value detection circuit 19 and the output signal Va of the amplifier 12 are generated by the peak value detection circuit 19 of FIG. It is something that is supplied.
【００２５】なお、この実施例回路では、前記オフセッ
ト電圧発生回路22を構成する前記抵抗21として抵抗17、
18を使用するようにしており、この実施例では抵抗21は
省略されている。In the circuit of this embodiment, the resistor 21 constituting the offset voltage generating circuit 22 is a resistor 17,
18 is used, and the resistor 21 is omitted in this embodiment.
【００２６】この実施例回路でも、上記第１の実施例回
路の場合と同様に、高感度化を図ることができ、無信号
時の雑音もなく、無信号時から光信号を再生することが
できるという効果を得ることができる。In the circuit of this embodiment, as in the case of the circuit of the first embodiment, high sensitivity can be achieved, and there is no noise when there is no signal, and the optical signal can be reproduced even when there is no signal. The effect that it can be obtained can be obtained.
【００２７】なお、この発明は上記実施例に限定される
ものではなく、種々の変形が可能であることはいうまで
もない。例えば上記各実施例では、増幅器12は受光素子
11の電流信号ｉと逆相の電圧信号を出力する場合ついて
説明したが、これは増幅器12として受光素子11の電流信
号ｉと同相の電圧信号を出力するものを使用し、第１、
第２のピーク値検出回路13、19として負のピーク値を検
出する回路を使用するようしても同様の効果を得ること
ができる。It is needless to say that the present invention is not limited to the above embodiment and various modifications can be made. For example, in each of the above embodiments, the amplifier 12 is a light receiving element.
The case of outputting a voltage signal having a phase opposite to that of the current signal i of 11 has been described, but this uses an amplifier 12 that outputs a voltage signal of the same phase as the current signal i of the light receiving element 11, and
The same effect can be obtained by using a circuit that detects a negative peak value as the second peak value detection circuits 13 and 19.
【００２８】[0028]
【発明の効果】以上説明したようにこの発明によれば、
高感度で無信号時の雑音もなく、なおかつ無信号時から
光信号を再生することができる光信号受信回路を提供す
ることができる。As described above, according to the present invention,
It is possible to provide an optical signal receiving circuit which is highly sensitive and has no noise when there is no signal, and which can regenerate an optical signal when there is no signal.
【図１】この発明の第１の実施例回路の回路図。FIG. 1 is a circuit diagram of a circuit according to a first embodiment of the present invention.
【図２】上記第１の実施例回路の波形図。FIG. 2 is a waveform diagram of the circuit according to the first embodiment.
【図３】この発明の第２の実施例回路の回路図。FIG. 3 is a circuit diagram of a second embodiment circuit according to the present invention.
【図４】従来の回路図。FIG. 4 is a conventional circuit diagram.
【図５】従来の回路図。FIG. 5 is a conventional circuit diagram.
11…受光素子、12…増幅器、13…第１のピーク値検出回
路、14…差動増幅器、15…ダイオード、16…キャパシ
タ、17，18…抵抗、19…第２のピーク値検出回路、20…
電流源、21…抵抗、22…オフセット電圧発生回路、23…
比較器。11 ... Light receiving element, 12 ... Amplifier, 13 ... First peak value detection circuit, 14 ... Differential amplifier, 15 ... Diode, 16 ... Capacitor, 17, 18 ... Resistor, 19 ... Second peak value detection circuit, 20 …
Current source, 21 ... Resistor, 22 ... Offset voltage generation circuit, 23 ...
Comparator.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年１１月１６日[Submission date] November 16, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図４[Name of item to be corrected] Fig. 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図４】 [Figure 4]
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 10/14 10/04 10/06 Ｈ０４Ｌ 25/03 Ｅ 9199−5Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location H04B 10/14 10/04 10/06 H04L 25/03 E 9199-5K
Claims (2)
と、 上記受光素子で変換された電気信号を増幅する増幅器
と、 上記増幅器の出力信号のピーク値を検出する第１のピー
ク値検出回路と、 上記第１のピーク値検出回路の出力端子と上記増幅器の
出力端子との間に直列接続され、互いに等価な抵抗値を
持つ一対の抵抗素子と、 上記増幅器の出力信号を基準にして上記一対の抵抗素子
の直列接続点の信号のピーク値を検出する第２のピーク
値検出回路と、 上記第２のピーク値検出回路に所定のオフセット電圧を
供給するオフセット電圧発生回路と、 上記第１、第２のピーク値検出回路の出力電圧を比較す
る比較器とを具備したことを特徴とする光信号受信回
路。1. A light receiving element for converting an optical signal into an electric signal, an amplifier for amplifying the electric signal converted by the light receiving element, and a first peak value detection circuit for detecting a peak value of an output signal of the amplifier. A pair of resistance elements connected in series between the output terminal of the first peak value detection circuit and the output terminal of the amplifier and having resistance values equivalent to each other; A second peak value detection circuit that detects a peak value of a signal at a series connection point of a pair of resistance elements; an offset voltage generation circuit that supplies a predetermined offset voltage to the second peak value detection circuit; And a comparator that compares the output voltages of the second peak value detection circuit.
と、 上記受光素子で変換された電気信号を増幅する増幅器
と、 上記増幅器の出力信号のピーク値を検出する第１のピー
ク値検出回路と、 上記増幅器の出力信号を基準にして上記第１のピーク値
検出回路の出力信号のピーク値を検出する第２のピーク
値検出回路と、 上記増幅器の出力端子と上記第２のピーク値検出回路の
出力端子との間に直列接続され、互いに等価な抵抗値を
持つ一対の抵抗素子と、 上記第２のピーク値検出回路に所定のオフセット電圧を
供給するオフセット電圧発生回路と、 上記第１のピーク値検出回路の出力電圧と上記一対の抵
抗素子の直列接続点の信号の電圧とを比較する比較器と
を具備したことを特徴とする光信号受信回路。2. A light receiving element for converting an optical signal into an electric signal, an amplifier for amplifying the electric signal converted by the light receiving element, and a first peak value detection circuit for detecting a peak value of an output signal of the amplifier. A second peak value detection circuit for detecting the peak value of the output signal of the first peak value detection circuit with reference to the output signal of the amplifier; an output terminal of the amplifier and the second peak value detection; A pair of resistance elements connected in series with the output terminal of the circuit and having equivalent resistance values; an offset voltage generation circuit for supplying a predetermined offset voltage to the second peak value detection circuit; 2. An optical signal receiving circuit, comprising: a comparator for comparing the output voltage of the peak value detection circuit of 1. with the voltage of the signal at the series connection point of the pair of resistance elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27184893A JP3270221B2 (en) | 1993-10-29 | 1993-10-29 | Optical signal receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27184893A JP3270221B2 (en) | 1993-10-29 | 1993-10-29 | Optical signal receiving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07131489A true JPH07131489A (en) | 1995-05-19 |
| JP3270221B2 JP3270221B2 (en) | 2002-04-02 |
Family
ID=17505726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27184893A Expired - Fee Related JP3270221B2 (en) | 1993-10-29 | 1993-10-29 | Optical signal receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3270221B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181454B1 (en) | 1997-04-23 | 2001-01-30 | Nec Corporation | Adaptive threshold controlled decision circuit immune to ringing components of digital signals |
| JP2012015724A (en) * | 2010-06-30 | 2012-01-19 | Nippon Telegr & Teleph Corp <Ntt> | Noise signal estimation device, noise signal estimation method, and optical receiver |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5222652B2 (en) | 2008-07-30 | 2013-06-26 | 株式会社日立国際電気 | Substrate processing apparatus and semiconductor device manufacturing method |
-
1993
- 1993-10-29 JP JP27184893A patent/JP3270221B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181454B1 (en) | 1997-04-23 | 2001-01-30 | Nec Corporation | Adaptive threshold controlled decision circuit immune to ringing components of digital signals |
| JP2012015724A (en) * | 2010-06-30 | 2012-01-19 | Nippon Telegr & Teleph Corp <Ntt> | Noise signal estimation device, noise signal estimation method, and optical receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3270221B2 (en) | 2002-04-02 |
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