JPS62220007A - Broad band amplifier - Google Patents
Broad band amplifierInfo
- Publication number
- JPS62220007A JPS62220007A JP6295186A JP6295186A JPS62220007A JP S62220007 A JPS62220007 A JP S62220007A JP 6295186 A JP6295186 A JP 6295186A JP 6295186 A JP6295186 A JP 6295186A JP S62220007 A JPS62220007 A JP S62220007A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- output
- operational amplifier
- circuit
- stage
- 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
- Amplifiers (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
個別の演算増幅器を複数個縦続接続することにより高周
波増幅特性を与え且つ直流帰還回路を設けることにより
直流出力を安定化する。[Detailed Description of the Invention] [Summary] High frequency amplification characteristics are provided by cascading a plurality of individual operational amplifiers, and DC output is stabilized by providing a DC feedback circuit.
本発明は広帯域増幅器の改良に関する。 The present invention relates to improvements in wideband amplifiers.
ディジタル通信装置においては局内インタフェイス回路
としてバイポーラ・ユニポーラ信号変換回路を標準的に
備えている。この回路は線路を介し受信されたバイポー
ラ信号を先ず増幅し、増幅された信号を判定回路へ供給
し、受信データがプラスデータであるかマイナスデータ
であるかを判定する。Digital communication devices are standardly equipped with a bipolar/unipolar signal conversion circuit as an in-office interface circuit. This circuit first amplifies the bipolar signal received via the line, supplies the amplified signal to a determining circuit, and determines whether the received data is positive data or negative data.
この場合、受信データは伝送線路において減衰をうけて
いるから等化増幅したのち、比較器に供給しなくてはな
らない。この際、ディジタル通信の高速化に伴ないビッ
トレイトが高くなった場合でも、高周波領域において安
定な増幅度を持ち且つ、判定回路にてレベル検出が安定
に行える様に直流レベルの安定化した広帯域増幅器の提
供が望まれる。In this case, since the received data is attenuated in the transmission line, it must be equalized and amplified before being supplied to the comparator. In this case, even if the bit rate increases due to the speeding up of digital communication, it has a stable amplification degree in the high frequency region and a wide band with a stabilized DC level so that the level detection can be stably performed by the judgment circuit. Provision of an amplifier is desired.
複極性パルスを単極性パルスに変換するＢ−Ｕ変換器に
使用されている多段増幅器の従来例を第３図のブロック
回路図に示す。A conventional example of a multistage amplifier used in a BU converter that converts bipolar pulses into unipolar pulses is shown in the block circuit diagram of FIG.
図において、１．２は縦続接続された増幅器であ５゛
、
る。高周波数領域では増幅器の増幅度が低下するメヤ、
多段接続の増幅器構成としている。In the figure, 1.2 is a cascaded amplifier.
, Ru. The amplification degree of the amplifier decreases in the high frequency region,
It has a multi-stage connected amplifier configuration.
この場合、増幅器はトランジスタ増幅器の組み合わされ
たものを使用しており、高周波増幅器は負帰還回路を設
けると、位相回転にともなう発振を起こし易いので、無
帰還の多段増幅器が用いられている。In this case, the amplifier is a combination of transistor amplifiers, and if a high-frequency amplifier is provided with a negative feedback circuit, it tends to cause oscillation due to phase rotation, so a multistage amplifier without feedback is used.
また、最終段はレベル判定に用いる出力を得るために、
極性反転用増幅器３及び容量５を介し直流バイアス回路
６へ接続する出力回路と、極性反転せず直接容Ｍ７を介
し直流バイアス回路６へ接続する出力回路とを備える。In addition, in order to obtain the output used for level judgment, the final stage is
It includes an output circuit connected to the DC bias circuit 6 via the polarity inverting amplifier 3 and the capacitor 5, and an output circuit directly connected to the DC bias circuit 6 via the capacitor M7 without polarity inversion.
レベル判定回路へ信号を供給する高周波増幅回路は充分
大きな増幅度を有し、増幅特性が安定しており、反転出
力もまた非反転出力もともに直流出力が安定したことが
必要である。The high frequency amplifier circuit that supplies the signal to the level determination circuit must have a sufficiently large amplification degree, stable amplification characteristics, and stable DC output for both inverted and non-inverted outputs.
このように、高周波特性と直流安定度が良好であること
が重要であるが、従来回路においては発振防止のために
負帰還を使用出来ないので増幅特性は良好でなく、直流
特性も安定しない欠点がある。As described above, it is important to have good high frequency characteristics and DC stability, but in conventional circuits, negative feedback cannot be used to prevent oscillation, so the amplification characteristics are not good and the DC characteristics are not stable. There is.
上記の問題点は、第１図の本発明の原理図に示す様に、
各個の増幅段に交流及び直流帰還回路１２−Ｌ１２−２
を設けた演算増幅器１ｌ−Ｌｌｌ−２を縦続接続し、終
段に非反転出力部と反転出力部をも゛つ演算増幅器を配
置して、該出力部の一方から初段入力部に直流帰還回路
１３を備えた広帯域増幅器によって解決される。The above problems are solved as shown in the principle diagram of the present invention in FIG.
AC and DC feedback circuit 12-L12-2 for each amplifier stage
Operational amplifiers 1l-Lll-2 are connected in cascade, and an operational amplifier having a non-inverting output part and an inverting output part is arranged at the final stage, and a DC feedback circuit is connected from one of the output parts to the first-stage input part. The solution is a broadband amplifier with 13.
本発明によれば、交流および直流帰還回路１２−１．１
２−２を個々に備える複数個の増幅段１１−１．１１−
２を縦続接続することにより高周波特性の改善を行う。According to the invention, AC and DC feedback circuit 12-1.1
a plurality of amplification stages 11-1.11- each comprising 2-2;
The high frequency characteristics are improved by cascading two.
即ち各個増幅器において実現容易な位相回転１８０度以
下の設定により発振条件を避けて所要の高周波の増幅器
を構成し、直流特性の安定化は出力段増幅器出力部から
入力段増幅器の入力部へ直流帰還回路１３を設けること
により実行する。In other words, by setting a phase rotation of 180 degrees or less, which is easy to achieve in each amplifier, an amplifier with the required high frequency is configured while avoiding oscillation conditions, and the DC characteristics are stabilized by direct current feedback from the output section of the output stage amplifier to the input section of the input stage amplifier. This is carried out by providing the circuit 13.
各増幅器段は演算増幅器にて構成され、終段演算増幅器
１１−２は、反転出力部と非反転出力部をもつことによ
り直流安定度が良好となる。Each amplifier stage is composed of an operational amplifier, and the final stage operational amplifier 11-2 has an inverting output section and a non-inverting output section, so that DC stability is improved.
また反転入力部と非反転入力部を持つ演算増幅器は一方
の入力部は個々の増幅器の帰還入力部にまた他方を直流
帰還入力部として独立に使用することが出来る。Furthermore, an operational amplifier having an inverting input section and a non-inverting input section can be used independently, with one input section being used as a feedback input section of an individual amplifier, and the other input section being used as a DC feedback input section.
図示実施例に従い、本発明の詳細な説明する。 The present invention will be described in detail with reference to the illustrated embodiments.
第２図は本発明一実施例の広帯域増幅器の回路図である
。FIG. 2 is a circuit diagram of a wideband amplifier according to an embodiment of the present invention.
増幅器は演算増幅器１１−１．演算増幅器１１−２から
構成され、入力信号は変成器Ｔを介し入力される。変成
器の２次巻線は一端が演算増幅器１１−１の非反転入力
部に接続され、他端は容量Ｃを介し交流的に地気に接続
する。演算増幅器１１−１の出力部は演算増幅器１１−
２の非反転入力部に接続される。演算増幅器の出力部は
抵抗ｒｌｌ、 ｒ１２或いはｒ２１ 、 ｒ２２を介し
地気へ接続し、各両抵仇の接続点が演算層の反転入力部
にそれぞれ接続される、各増幅段において、交流帰還と
直流帰還が与えられる。The amplifier is an operational amplifier 11-1. It is composed of an operational amplifier 11-2, and an input signal is inputted through a transformer T. One end of the secondary winding of the transformer is connected to the non-inverting input section of the operational amplifier 11-1, and the other end is connected to the earth via a capacitor C in an alternating current manner. The output section of the operational amplifier 11-1 is the operational amplifier 11-1.
2 non-inverting input. The output of the operational amplifier is connected to the earth via resistors rll, r12 or r21, r22, and the connection point of each resistor is connected to the inverting input of the operational layer.In each amplifier stage, AC feedback and DC feedback is provided.
終段演算増幅器１１−２は非反転出力部と反転出力部を
持ち、反転出力信号が抵抗ｒｄを介し変成器２次巻線の
交流的に地気された端子に接続する。The final stage operational amplifier 11-2 has a non-inverting output part and an inverting output part, and the inverted output signal is connected to the alternating current grounded terminal of the transformer secondary winding via a resistor rd.
抵抗ｒｄは縦続増幅回路の直流帰還回路を構成して、増
幅器の直流出力の安定化を行う。The resistor rd constitutes a DC feedback circuit of the cascaded amplifier circuit and stabilizes the DC output of the amplifier.
反転出力部と非反転出力部を有する演算増幅器の出力信
号は従来回路のように容量をかいし直流バイアスＩｍ整
回路に供給することがないので出力部に容量素子を設け
ることは不要となる。Since the output signal of the operational amplifier having an inverting output section and a non-inverting output section is not supplied to the DC bias Im rectifying circuit through a capacitance as in the conventional circuit, it is not necessary to provide a capacitive element at the output section.
以上述べたように、本発明によれば高周波増幅が容易に
行うことが出来、特性改善の為に負帰還の使用を可能と
し、直流出力の安定を行うことが出来、さらに大型集積
回路として実現容易な広帯域増幅器を提供するもので、
その作用効果は極めて大きい。As described above, according to the present invention, high frequency amplification can be easily performed, negative feedback can be used to improve characteristics, DC output can be stabilized, and furthermore, it can be realized as a large integrated circuit. It provides a simple broadband amplifier,
Its effects are extremely large.
第１図の本発明の原理図、
第２図は本発明一実施例の広帯域増幅器の回路図、
第３図は多段増幅器の従来例のブロック回路図を示す。
図において、
１．２．３は増幅器、１１−１．１１−２は演算増幅器
５．７、Ｃは容量、
６は直流バイアス回路、
１２−１．１２−２．は交流及び直流帰還回路１３は直
流帰還回路、
ｒｌｌ、ｒ１２．ｒ２１＋ｒ２２＋ｒｄは抵抗、第
１ 図
第２図FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a circuit diagram of a broadband amplifier according to an embodiment of the present invention, and FIG. 3 is a block circuit diagram of a conventional example of a multistage amplifier. In the figure, 1.2.3 is an amplifier, 11-1.11-2 is an operational amplifier 5.7, C is a capacitor, 6 is a DC bias circuit, 12-1.12-2. are AC and DC feedback circuits 13 are DC feedback circuits, rll, r12. r21+r22+rd is the resistance,
1 Figure 2
Claims (1)
算増幅器（１１−１）（１１−２）を備え、該増幅器の
終段出力部の一方から第１段増幅器（１１−１）の入力
部へ直流負帰還回路（１３）を設けたことを特徴する広
帯域増幅器。A plurality of operational amplifiers (11-1) (11-2) are connected in cascade and each stage has a feedback circuit. A wideband amplifier characterized in that a DC negative feedback circuit (13) is provided to the input section of the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6295186A JPS62220007A (en) | 1986-03-20 | 1986-03-20 | Broad band amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6295186A JPS62220007A (en) | 1986-03-20 | 1986-03-20 | Broad band amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62220007A true JPS62220007A (en) | 1987-09-28 |
Family
ID=13215134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6295186A Pending JPS62220007A (en) | 1986-03-20 | 1986-03-20 | Broad band amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62220007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002094336A (en) * | 2000-09-13 | 2002-03-29 | Nf Corp | Cascaded amplifier |
-
1986
- 1986-03-20 JP JP6295186A patent/JPS62220007A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002094336A (en) * | 2000-09-13 | 2002-03-29 | Nf Corp | Cascaded amplifier |
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