JPS622705A - Gaas fet amplifier - Google Patents
Gaas fet amplifierInfo
- Publication number
- JPS622705A JPS622705A JP14054485A JP14054485A JPS622705A JP S622705 A JPS622705 A JP S622705A JP 14054485 A JP14054485 A JP 14054485A JP 14054485 A JP14054485 A JP 14054485A JP S622705 A JPS622705 A JP S622705A
- Authority
- JP
- Japan
- Prior art keywords
- input
- amplifier
- output
- working point
- conversion coefficient
- 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】
〔発明の技術分野〕
本発明は、ＵＨＦ帯、ＳＨＦ帯等のマイクロ波帯で使用
するＧａＡｓＦＥＴ増幅器に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a GaAsFET amplifier used in microwave bands such as the UHF band and the SHF band.
従来このようなＧａＡｓＦＥＴ増幅器は、マイクロ波帯
で高出力を得るための電力増幅用および低雑音特性を得
るための低雑音増幅用等に利用され、一般に多段縦続接
続して使用されている。Conventionally, such GaAsFET amplifiers have been used for power amplification to obtain high output in the microwave band, low noise amplification to obtain low noise characteristics, etc., and are generally used in multi-stage cascade connection.
このＧａＡ、ＦＥＴ増幅器は、第３図に示すような入出
力特性イおよび入力−通過位相特性口をもっており、通
過位相は入力レベルの変化に対し入出力特性のリニアな
領域ではなだらかに変化するが、増幅器の出力が飽和し
てくると急激に変化するようになる。従って入力レベル
の変化分に対する通過位相の変化分の比で表わされるＡ
Ｍ／ＰＭ変換係数は、入出力特性のリニアな領域ではそ
の値は小さく、飽和領域では大きな値となる。またＡＭ
／ＰＭ変換係数の極性は、入力レベルに対して正または
負の値をとる。This GaA, FET amplifier has an input/output characteristic and an input-passing phase characteristic as shown in Fig. 3, and the passing phase changes gently in the linear region of the input/output characteristic with respect to changes in the input level. , when the output of the amplifier reaches saturation, it starts to change rapidly. Therefore, A is expressed as the ratio of the change in the passing phase to the change in the input level.
The M/PM conversion coefficient has a small value in a linear region of input/output characteristics, and a large value in a saturated region. Also AM
The polarity of the /PM conversion coefficient takes a positive or negative value with respect to the input level.
このＡＭ／ＰＭ変換係数は、大容量のＦＭ多重電話信号
伝送時、あるいは大容量ディジタル信号伝送時に歪雑音
の発生原因となるので、小さい値で使用することが要求
される。このため、第３図の増幅器の例では、入出力動
作点を飽和出力点よりバック・オフをとって入出力特性
イがリニアな領域、例えばＡ点に設定する必要があった
。This AM/PM conversion coefficient is required to be used at a small value because it causes distortion noise when transmitting large-capacity FM multiplex telephone signals or transmitting large-capacity digital signals. For this reason, in the example of the amplifier shown in FIG. 3, it was necessary to set the input/output operating point to a region where the input/output characteristics are linear, for example, point A, by backing off from the saturated output point.
しかし、このようなＧａＡＳＦＥＴ増幅器では、バック
・オフをとるため飽和出力を運用出力より高くする必要
性が生じ、このため高出力の素子を使用しなければなら
ないので、直流消費電力が増加し、電源効率が低下する
結果となる。従って電源供給装置は、その容量を大きく
する必要性が生じ、増幅器の放熱器に関しても熱抵抗の
小さいものが必要となり、さらに素子自体の価格も増加
する等の問題点があった。However, in such a GaASFET amplifier, it is necessary to make the saturated output higher than the operational output in order to take back-off, and this requires the use of high-output elements, which increases DC power consumption and reduces the power supply. This results in reduced efficiency. Therefore, the capacity of the power supply device needs to be increased, and the heat radiator of the amplifier needs to have a low thermal resistance, and there are also problems such as an increase in the cost of the device itself.
本発明は、上記問題点ｌこ鑑みなされたもので、飽和出
力点よりバック・オフを大きくとって入出力動作点を設
定しなくてもＡＭ／ＰＭ変換係数の値を小さくするＧ
ａ Ａ ｓ Ｆ Ｅ Ｔ増幅器を提供することを目的と
する。The present invention was made in view of the above-mentioned problems, and the present invention has been developed to reduce the value of the AM/PM conversion coefficient without setting the input/output operating point by setting the back-off larger than the saturated output point.
An object of the present invention is to provide an aAsFET amplifier.
本発明は、第１の可変減衰器の入力レベルの調整により
入出力動作点を設定する副増幅器と、第２の可変減衰器
の入力レベルの調整により入出力動作点を設定する主増
幅器とを縦続接続し、前記主増幅器で生ずるＡＭ／ＰＭ
変換係数を打消すように前記副増幅器の入出力動作点を
設定したことにより上記した目的を達成している。The present invention includes a sub-amplifier that sets the input/output operating point by adjusting the input level of the first variable attenuator, and a main amplifier that sets the input/output operating point by adjusting the input level of the second variable attenuator. AM/PM generated in the main amplifier in cascade connection
The above objective is achieved by setting the input/output operating points of the sub-amplifier so as to cancel the conversion coefficients.
本発明の実施例を第１図乃至第２０図の図面に基づいて
詳細に説明する。Embodiments of the present invention will be described in detail based on the drawings of FIGS. 1 to 20.
＠１図は、本発明の実施例を示すブロック図で、入力端
子１１から入力した入力信号は、第１の可変減衰器１２
で副増幅器１３が所定の入出力動作点を設定できるよう
に入力レベルを調整される。この調整された入力レベル
ｌこより副増幅器１３は入出力動作点を設定し、この入
出力動作点にともなう増幅した出力信号を第２可変減衰
器１４に出力する。Figure @1 is a block diagram showing an embodiment of the present invention, in which the input signal input from the input terminal 11 is input to the first variable attenuator 12.
The input level is adjusted so that the sub-amplifier 13 can set a predetermined input/output operating point. Based on this adjusted input level l, the sub-amplifier 13 sets an input/output operating point, and outputs an amplified output signal corresponding to this input/output operating point to the second variable attenuator 14.
上記入出力動作点でのＡＭ／ＰＭ変換係数は、後述する
主増幅器１５の入出力動作点でのＡＭ／ＰＭ変換係数と
極性が逆で絶対値が等しくなるように設定する。The AM/PM conversion coefficient at the input/output operating point is set to have opposite polarity and equal absolute value to the AM/PM conversion coefficient at the input/output operating point of the main amplifier 15, which will be described later.
第２町変減衰器１４では、主増幅器１５が所定の入出力
動作点を設定できるように副増幅器１３からの入力レベ
ルを調整し、この調整された入力レベルｌこより主増幅
器１５は入出力動作点を設定し、この入出力動作点にと
もなう増幅した出力信号を出力端子１６に出力する。The second variable attenuator 14 adjusts the input level from the sub-amplifier 13 so that the main amplifier 15 can set a predetermined input/output operating point. A point is set, and an amplified output signal associated with this input/output operating point is output to the output terminal 16.
第２図は、各増幅器の入出力特性イおよび入力−通過位
相特性口を示す図で、第２図（ａ）は主増幅器、（ｂ）
は副増幅器の場合を示す。Figure 2 is a diagram showing the input/output characteristics and input-passing phase characteristics of each amplifier. Figure 2 (a) shows the main amplifier, (b)
indicates the case of a sub-amplifier.
第２図（ａ）において主増幅器１５の入出力動作点を例
えば飽和出力領域のＢ点とすると、入力−通過位相特性
口のＢ′点ではＢ′点の傾きＩこ相当するＡＭ／ＰＭ変
換係数が発生する。In FIG. 2(a), if the input/output operating point of the main amplifier 15 is, for example, point B in the saturated output region, then at point B' at the input-pass phase characteristic opening, the slope I at point B' is A coefficient occurs.
よって副増幅器１３では、ｆｓｚ図（ｂ）に示すように
入出力動作点を主増幅器１５のＡＭ／ＰＭ変換係数と極
性が逆で絶対値が等しい０１点（こなるように、！１可
変減衰器１２で設定すれば主増幅器のＡＭ／ＰＭ変換係
数を打消すことができる。Therefore, in the sub-amplifier 13, as shown in the fsz diagram (b), the input/output operating point is set to the 01 point, which has the opposite polarity and the same absolute value as the AM/PM conversion coefficient of the main amplifier 15 (as shown in the !1 variable attenuation point). By setting it in the amplifier 12, the AM/PM conversion coefficient of the main amplifier can be canceled.
以上説明したように、本発明は第１の可変減衰器の入力
レベルの調整により入出力動作点を設定する副増幅器と
、第２の可変減衰器の入力レベルの調整により入出力動
作点を設定する主増幅器とを縦続接続し、前記主増幅器
で生ずるＡＭ／ＰＭ変換係数を打消すように前記副増幅
器の入出力動作点を設定したので、主増幅器の飽和領域
に入出力動作点を設定でき、かつＡＭ／ＰＭ変換係数を
低減することができる。よって増幅器の電源効率を上げ
ることができ、さらに高出力ｃａＡｓＦＥＴ素子が不Ｑ
となり、素子自体の価格も低下する等の効果を奏する。As explained above, the present invention provides a sub-amplifier that sets the input/output operating point by adjusting the input level of the first variable attenuator, and a sub-amplifier that sets the input/output operating point by adjusting the input level of the second variable attenuator. The input/output operating point of the sub-amplifier is set in such a way as to cancel the AM/PM conversion coefficient generated in the main amplifier, so the input/output operating point can be set in the saturation region of the main amplifier. , and the AM/PM conversion coefficient can be reduced. Therefore, the power supply efficiency of the amplifier can be increased, and the high output caAsFET element can be
Therefore, the cost of the element itself is reduced.
第１図は本発明のブロック構成図、第２図は本発明のＧ
ａＡｓＦＥＴ増幅器の入出力特性および入力−通過位相
特性を示す図で（ａ）は主増幅器、（ｂ）は副増幅器の
場合を示す図、第３図は従来のＧａＡ、ＦＥＴ増幅器の
入出力特性および入力−通過位相特性を示す図の一例で
ある。
１２・・・第１の可変減衰器、′１３・・・副増幅器、
１４・・・第２の可変減衰器、１５・・・主増幅器、イ
・・・入出力特性、ロ・・・入力−通過位相特性。
代理人弁理士 則近憲佑（ほか１匈
１２−一−−第１の可多２欧衰１瓢
１３−−−−昌ＩＩす誼９−１１
１４−−−一第２の可ｌ！減ｙ！Ｉ巳
１５−−−−１糟幅区
一人力
第３図FIG. 1 is a block diagram of the present invention, and FIG. 2 is a block diagram of the present invention.
Figure 3 shows the input/output characteristics and input-passing phase characteristics of the aAsFET amplifier. (a) is the main amplifier, (b) is the sub amplifier. Figure 3 shows the input/output characteristics and input-passing phase characteristics of the conventional GaA FET amplifier It is an example of a figure which shows an input-passing phase characteristic. 12...First variable attenuator,'13...Sub amplifier,
14... Second variable attenuator, 15... Main amplifier, A... Input/output characteristics, B... Input-passing phase characteristics. Agent Patent Attorney Kensuke Norichika (and 1 匈12-1--1st number 2 European decline 1 13-----Sho II 9-11 14--1 2nd number! Reduced y!
Claims (1)
点を設定する副増幅器と、第２の可変減衰器の入力レベ
ルの調整により入出力動作点を設定する主増幅器とを縦
続接続し、前記主増幅器で生ずるＡＭ／ＰＭ変換係数を
打消すように前記副増幅器の入出力動作点を設定したこ
とを特徴とするＧａＡｓＦＥＴ増幅器。A sub-amplifier that sets the input/output operating point by adjusting the input level of the first variable attenuator and a main amplifier that sets the input/output operating point by adjusting the input level of the second variable attenuator are connected in cascade, A GaAs FET amplifier characterized in that input/output operating points of the sub-amplifier are set so as to cancel an AM/PM conversion coefficient generated in the main amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14054485A JPS622705A (en) | 1985-06-28 | 1985-06-28 | Gaas fet amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14054485A JPS622705A (en) | 1985-06-28 | 1985-06-28 | Gaas fet amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS622705A true JPS622705A (en) | 1987-01-08 |
Family
ID=15271140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14054485A Pending JPS622705A (en) | 1985-06-28 | 1985-06-28 | Gaas fet amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS622705A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005057599A (en) * | 2003-08-06 | 2005-03-03 | Mitsubishi Electric Corp | Multi-stage high output amplifier |
| JP2014175122A (en) * | 2013-03-07 | 2014-09-22 | Toshiba Corp | Microwave heating device and exhaust emission control system |
-
1985
- 1985-06-28 JP JP14054485A patent/JPS622705A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005057599A (en) * | 2003-08-06 | 2005-03-03 | Mitsubishi Electric Corp | Multi-stage high output amplifier |
| JP4722384B2 (en) * | 2003-08-06 | 2011-07-13 | 三菱電機株式会社 | Multistage high power amplifier |
| JP2014175122A (en) * | 2013-03-07 | 2014-09-22 | Toshiba Corp | Microwave heating device and exhaust emission control system |
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