JPH0528811Y2 - - Google Patents
Info
- Publication number
- JPH0528811Y2 JPH0528811Y2 JP1985113872U JP11387285U JPH0528811Y2 JP H0528811 Y2 JPH0528811 Y2 JP H0528811Y2 JP 1985113872 U JP1985113872 U JP 1985113872U JP 11387285 U JP11387285 U JP 11387285U JP H0528811 Y2 JPH0528811 Y2 JP H0528811Y2
- Authority
- JP
- Japan
- Prior art keywords
- input
- coaxial cable
- unbalanced
- balanced
- output
- 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.)
- Expired - Lifetime
Links
- 239000004020 conductor Substances 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、テレビジヨン放送機等において高周
波電力を増幅するために用いるトランジスタ電力
増幅器に関し、特にプツシユプル動作をするトラ
ンジスタを使用したトランジスタ電力増幅器に関
する。[Detailed description of the invention] [Industrial application field] The present invention relates to a transistor power amplifier used to amplify high-frequency power in television broadcasting equipment, etc., and particularly relates to a transistor power amplifier using push-pull operation transistors. .
従来、この種のトランジスタ電力増幅器は、平
衡−不平衡変換トランスを形成する同軸ケーブル
の不平衡側は、同軸ケーブルの内導体が高周波信
号ラインに接続され、外導体が接地されていた。
Conventionally, in this type of transistor power amplifier, on the unbalanced side of a coaxial cable forming a balanced-unbalanced conversion transformer, the inner conductor of the coaxial cable was connected to a high frequency signal line, and the outer conductor was grounded.
従つて、高周波信号ラインに接続される内導体
は、同軸ケーブルの外導体と同一断面から、高周
波信号ラインまで寄生イングワタンスとして作用
する為にトランジスタの入力あるいは出力インピ
ーダンスとインピーダンス整合を行う際、広帯域
化を阻み、第３図及び第４図の周波数特性のグラ
フの破線１５に示すように、トランジスタ電力増
幅器の入力反射損失や電力利得が広帯域になりに
くい欠点を有していた。
Therefore, the inner conductor connected to the high frequency signal line acts as a parasitic inwattance from the same cross section as the outer conductor of the coaxial cable to the high frequency signal line, so when performing impedance matching with the input or output impedance of the transistor, it is necessary to widen the band. As shown by the broken line 15 in the frequency characteristic graphs of FIGS. 3 and 4, the input reflection loss and power gain of the transistor power amplifier are difficult to achieve over a wide band.
本考案の目的は、上述の従来の欠点を解決し、
同軸ケーブルの内導体によるインダクタンスの影
響をなくして広帯化を可能としたトランジスタ電
力増幅器を提供することにある。 The purpose of the present invention is to solve the above-mentioned conventional drawbacks,
It is an object of the present invention to provide a transistor power amplifier that can achieve a wide band by eliminating the influence of inductance caused by the inner conductor of a coaxial cable.
本考案によるトランジスタ電力増幅器は、プツ
シユプル動作をするトランジスタと、トランジス
タに対する入力用及び出力用のインピーダンス整
合回路と、これらインピーダンス整合回路にそれ
ぞれ接続される同軸ケーブルを用いた平衡−不平
衡変換トランスを有し、入力用あるいは入力用及
び出力用の平衡−不平衡変換トランスを形成する
同軸ケーブルの不平衡側において、外導体を高周
波信号ラインに接続し内導体を接地することによ
り、高周波信号ラインと同軸ケーブルの間のイン
ダクタンスを減少させ広帯域化を可能にしてい
る。
The transistor power amplifier according to the present invention has a transistor that performs push-pull operation, impedance matching circuits for input and output to the transistor, and a balanced-unbalanced conversion transformer using coaxial cables connected to each of these impedance matching circuits. By connecting the outer conductor to the high-frequency signal line and grounding the inner conductor on the unbalanced side of the coaxial cable that forms a balanced-unbalanced conversion transformer for input or for input and output, the high-frequency signal line and coaxial It reduces the inductance between cables and enables broadband.
次に本考案について図面を参照して説明する。
第１図は、本考案の一実施例を示す実装図、第２
図はその回路図である。第１図及び第２図におい
て、ある特定インピーダンスを有する誘電体基板
上の信号ライン１は、平衡−不平衡変換トランス
を形成する同軸ケーブル３に接続する。ここで高
周波信号ライン１側は不平衡であり、同軸ケーブ
ル３の内導体は、接地パターン２に接続され、外
導体は不平衡の高周波信号ライン１に接続され
る。ここで同軸ケーブル３の外導体は内導体に比
較し導体の周囲長が長いため、高周波信号ライン
１との間のインダクタンスが減少する。また高周
波信号ライン１から伝幡する高周波信号は、同軸
ケーブル３を通り平衡信号に変換され直流阻止コ
ンデンサ４と誘電体基板上の入力側インピーダン
ス整合パターン６、高周波短絡コンデンサ５、及
び整合用コンデンサ７で構成される入力インピー
ダンス整合回路を経て、プツシユプル動作トラン
ジスタ８に入力される。
Next, the present invention will be explained with reference to the drawings.
Figure 1 is an implementation diagram showing one embodiment of the present invention;
The figure is its circuit diagram. 1 and 2, a signal line 1 on a dielectric substrate having a certain impedance is connected to a coaxial cable 3 forming a balanced-unbalanced conversion transformer. Here, the high frequency signal line 1 side is unbalanced, the inner conductor of the coaxial cable 3 is connected to the ground pattern 2, and the outer conductor is connected to the unbalanced high frequency signal line 1. Here, since the outer conductor of the coaxial cable 3 has a longer circumferential length than the inner conductor, the inductance between it and the high frequency signal line 1 is reduced. Further, the high frequency signal propagating from the high frequency signal line 1 is converted into a balanced signal through the coaxial cable 3, and is transferred to a DC blocking capacitor 4, an input side impedance matching pattern 6 on the dielectric substrate, a high frequency shorting capacitor 5, and a matching capacitor 7. The signal is input to the push-pull operation transistor 8 through an input impedance matching circuit composed of the following.
本考案の実施例によると、前に述べたように同
軸ケーブル３の外導体と高周波信号ラインとの間
にインダクタンスが生じにくいため、プツシユプ
ル動作トランジスタの入力インピーダンスに整合
がとりやすく第３図の入力側反射損失の周波数特
性のグラフに示すように従来の特性に比べ広帯域
化が可能である。また入力側反射損失が広帯域に
なることによつて第４図電力利得の周波数特性の
グラフに示すように電力利得の広帯域化も可能に
なる。 According to the embodiment of the present invention, as mentioned earlier, inductance is less likely to occur between the outer conductor of the coaxial cable 3 and the high-frequency signal line, making it easier to match the input impedance of the push-pull operation transistor. As shown in the graph of the frequency characteristics of side reflection loss, it is possible to achieve a wider band than the conventional characteristics. Furthermore, since the reflection loss on the input side becomes wide-band, it becomes possible to widen the power gain as shown in the graph of frequency characteristics of power gain in FIG. 4.
一般に同軸ケーブル３は、高周波信号を伝送す
る場合、外導体を接地し内導体に不平衡信号を伝
送するが、本考案の場合には、同軸ケーブルを平
衡−不平衡変換トランスとして用いるため高周波
信号の伝送特性には影響を与えず、トランジスタ
電力増幅器の周波数特性を広帯域化することが可
能である。さらに、プツシユプル動作トランジス
タ８の出力には、誘電体基板上の出力側インピー
ダンス整合パターン９と、高周波短絡コンデンサ
５、整合用コンデンサ７及び直流阻止コンデンサ
４で構成される出力インピーダンス整合回路が接
続される。そしてプツシユプル動作トランジスタ
８で増幅された信号は前述の出力インピーダンス
整合回路を経て、出力側の平衡−不平衡変換トラ
ンスを形成する同軸ケーブル１０を通り不平衡信
号に変換され、出力側の高周波信号ライン１１に
接続される。トランジスタの出力側インピーダン
スは、その入力側インピーダンスに比べ数倍であ
るため出力側の同軸ケーブル１０は、従来と同じ
ように内導体を高周波信号ライン１１に接続し、
外導体を接地しても良い。また本考案の第２の実
施例に示すように入力側だけでなく出力側の同軸
ケーブル１０についても外導体を高周波信号ライ
ン１１に接続し、内導体を接地した場合にも、第
１の実施例と同じく周波数特性を広帯域化するこ
とが可能である。 Generally, when transmitting a high-frequency signal, the coaxial cable 3 uses the outer conductor to ground and transmits an unbalanced signal to the inner conductor. However, in the case of the present invention, the coaxial cable 3 is used as a balanced-unbalanced conversion transformer, so the high-frequency signal It is possible to widen the frequency characteristics of the transistor power amplifier without affecting the transmission characteristics of the transistor. Further, the output of the push-pull operation transistor 8 is connected to an output impedance matching pattern 9 on the dielectric substrate, and an output impedance matching circuit composed of a high frequency shorting capacitor 5, a matching capacitor 7, and a DC blocking capacitor 4. . Then, the signal amplified by the push-pull operation transistor 8 passes through the aforementioned output impedance matching circuit, passes through the coaxial cable 10 that forms the balanced-unbalanced conversion transformer on the output side, and is converted into an unbalanced signal, which is then converted to an unbalanced signal on the high-frequency signal line on the output side. 11. Since the output side impedance of a transistor is several times higher than its input side impedance, the inner conductor of the output side coaxial cable 10 is connected to the high frequency signal line 11 as in the conventional case.
The outer conductor may be grounded. Furthermore, as shown in the second embodiment of the present invention, the outer conductor of not only the input side but also the output side of the coaxial cable 10 is connected to the high frequency signal line 11 and the inner conductor is grounded. As in the example, it is possible to widen the frequency characteristics.
以上説明したように本考案は、プツシユプル動
作を行うトランジスタと、トランジスタに対する
入力用及び出力用のインピーダンス整合回路と、
これらインピーダンス整合回路にそれぞれ接続さ
れる同軸ケーブルを用いた平衡−不平衡変換トラ
ンスを有し、入力用あるいは入力用及び出力用の
平衡−不平衡変換トランスを形成する同軸ケーブ
ルの不平衡側において、外導体を高周波信号ライ
ンに接続し、内導体を接地することにより、高周
波信号ラインと同軸ケーブル間に生じるインダク
タンスを減少させ、トランジスタ電力増幅器の入
力反射損失及び出力電力利得の周波数特性を広帯
域化する効果を有する。
As explained above, the present invention includes a transistor that performs push-pull operation, an impedance matching circuit for input and output to the transistor,
A balanced-unbalanced conversion transformer using a coaxial cable is connected to each of these impedance matching circuits, and on the unbalanced side of the coaxial cable forming a balanced-unbalanced conversion transformer for input or input and output, By connecting the outer conductor to the high frequency signal line and grounding the inner conductor, the inductance generated between the high frequency signal line and the coaxial cable is reduced, and the frequency characteristics of the input return loss and output power gain of the transistor power amplifier are widened. have an effect.
第１図は本考案の一実施例を示す実装図、第２
図は上記実施例の回路図、第３図及び第４図は、
従来と本考案の周波数特性の比較を示すグラフ、
第５図は本考案の他の実施例を示す実装図、第６
図は従来のトランジスタ電力増幅器の一実施例を
示す実装図、第７図は、第６図の従来の実施例の
回路図である。
図において、１……入力側信号ライン、２……
接地パターン、３……入力側平衡−不平衡変換ト
ランスを形成する同軸ケーブル、４……直流阻止
コンデンサ、５……高周波短絡コンデンサ、６…
…入力側インピーダンス整合パターン、７……整
合用コンデンサ、８……プツシユプル動作トラン
ジスタ、９……出力側インピーダンス整合パター
ン、１０……出力側平衡−不平衡変換トランスを
形成する同軸ケーブル、１１……出力側信号ライ
ン、１５……従来の周波数特性曲線、１６……本
考案による周波数特性曲線。
Fig. 1 is an implementation diagram showing an embodiment of the present invention;
The figure is a circuit diagram of the above embodiment, and Figures 3 and 4 are
A graph showing a comparison of the frequency characteristics of the conventional and the present invention,
FIG. 5 is an implementation diagram showing another embodiment of the present invention, and FIG.
The figure is a mounting diagram showing one embodiment of a conventional transistor power amplifier, and FIG. 7 is a circuit diagram of the conventional embodiment of FIG. In the figure, 1...input side signal line, 2...
Grounding pattern, 3... Coaxial cable forming the input side balanced-unbalanced conversion transformer, 4... Direct current blocking capacitor, 5... High frequency short circuit capacitor, 6...
...Input side impedance matching pattern, 7... Matching capacitor, 8... Push-pull operation transistor, 9... Output side impedance matching pattern, 10... Coaxial cable forming output side balanced-unbalanced conversion transformer, 11... Output side signal line, 15... Conventional frequency characteristic curve, 16... Frequency characteristic curve according to the present invention.
Claims (1)
ル動作をする２つのトランジスタと、これらト
ランジスタに対する入力用及び出力用のインピ
ーダンス整合回路と、これらインピーダンス整
合回路にそれぞれ接続される入力用及び出力用
の平衡−不平衡変換トランスと、前記インピー
ダンス整合回路の少なくとも一部分が形成して
ある誘電体基板とを備え、前記平衡−不平衡変
換トランスがそれぞれ同軸ケーブルで形成して
あるトランジスタ電力増幅器において、前記入
力用及び出力用の平衡−不平衡変換トランスを
形成する唯一の同軸ケーブルのうち入力用の同
軸ケーブルの不平衡入力側で内導体が接地さ
れ、外導体が高周波信号ラインに接続されるこ
とを特徴とするトランジスタ電力増幅器。 (2) 前記１項のトランジスタ電力増幅器におい
て、入力用及び出力用の平衡−不平衡変換トラ
ンスを形成する各々の唯一の同軸ケーブルの不
平衡側で内導体が接地され、外導体が高周波信
号ラインに接続されることを特徴とするトラン
ジスタ電力増幅器。[Claims for Utility Model Registration] (1) Two transistors housed in a common container that perform push-pull operation with each other, impedance matching circuits for input and output to these transistors, and connections to these impedance matching circuits, respectively. balanced-to-unbalanced conversion transformers for input and output; and a dielectric substrate on which at least a portion of the impedance matching circuit is formed, and each of the balanced-to-unbalanced conversion transformers is formed of a coaxial cable. In a certain transistor power amplifier, the inner conductor is grounded on the unbalanced input side of the input coaxial cable, which is the only coaxial cable forming the input and output balanced-unbalanced conversion transformers, and the outer conductor is connected to the high-frequency signal. A transistor power amplifier characterized in that it is connected to a line. (2) In the transistor power amplifier of item 1 above, the inner conductor is grounded on the unbalanced side of each unique coaxial cable forming the input and output balanced-unbalanced conversion transformers, and the outer conductor is connected to the high-frequency signal line. A transistor power amplifier characterized in that it is connected to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985113872U JPH0528811Y2 (en) | 1985-07-24 | 1985-07-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985113872U JPH0528811Y2 (en) | 1985-07-24 | 1985-07-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6221617U JPS6221617U (en) | 1987-02-09 |
| JPH0528811Y2 true JPH0528811Y2 (en) | 1993-07-23 |
Family
ID=30996079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985113872U Expired - Lifetime JPH0528811Y2 (en) | 1985-07-24 | 1985-07-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528811Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2529038B2 (en) * | 1991-07-19 | 1996-08-28 | 株式会社日立製作所 | High frequency and high efficiency power amplifier |
| EP2899803B1 (en) | 2014-01-24 | 2020-06-24 | Ampleon Netherlands B.V. | Circuit comprising balun and impedance transforming elements |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5915057Y2 (en) * | 1978-10-31 | 1984-05-04 | 株式会社東芝 | Transmission line type balanced unbalanced conversion transformer |
-
1985
- 1985-07-24 JP JP1985113872U patent/JPH0528811Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6221617U (en) | 1987-02-09 |
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